Free online tools for everyday tasks
Everyday tools for images, PDFs, text, code and calculations — ready to use, with nothing to install and no sign-up.
Recently used
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Popular tools
- Image Compressor Image
- Compress PDF PDF
- Merge PDF PDF
- QR Code Generator QR & Barcode
- PDF to JPG Converter PDF
- JSON Formatter & Validator Developer
- Passport Photo Maker Image
- Word Counter Text
- Online Countdown Timer Date & Time
- Image Resizer Image
- Video to GIF Converter Video & Audio
- Webcam Test Device Tests
QR & Barcode 8 tools
- QR Code Generator Make a QR code for a link, Wi-Fi network, contact card, email, SMS, location or calendar event.
- QR Code Scanner Upload a photo, paste a screenshot or use your camera to read QR codes and barcodes.
- Barcode Generator Generate retail, shipping and 2D barcodes in the browser.
- WiFi QR Code Generator Make a QR code that joins your Wi-Fi network when scanned — no more reading out long passwords.
- Bulk QR Code Generator Turn a list of links, product codes or table numbers into QR codes in one go.
- Barcode Scanner Read the number or text in a barcode from a photo, a screenshot or your camera — product EAN and UPC codes, book ISBNs, or Code 128 on shipping labels.
- QR Code Checker Before printing a poster or package, or publishing a QR code online, upload the image to check whether it scans, whether contrast and the quiet zone are adequate, and whether it still reads when shrunk.
- vCard QR Code Generator Put a QR code on your business card, conference badge or CV, and anyone who scans it with their phone camera can save your contact details in one tap — no typing.
Image 43 tools
- Image Compressor Reduce image file size with the same encoders Google's Squoosh uses — MozJPEG, OxiPNG, libwebp and libavif — right in your browser.
- Image Converter Convert images between JPG, PNG, WebP and AVIF — for example WebP to JPG for an older app, or PNG to WebP for a faster website.
- Compress Image to 100 KB Many application forms, ID photo uploads and profile pages reject images over 100 KB.
- Image Resizer Change an image’s pixel size — to a maximum width and height, by a percentage, or to an exact width × height (crop to fill or pad, no distortion).
- EXIF Viewer & Remover Photos carry hidden details — camera model, settings, the time they were taken and often the exact GPS location.
- Favicon Generator Create a complete favicon set from a letter, an emoji or your logo.
- PNG to JPG Converter Convert PNG images to JPG to make photos and large screenshots much smaller, or to upload them where only JPG is accepted.
- JPG to PNG Converter Convert JPG photos and images to PNG when a website, app or design tool requires PNG, or before editing an image repeatedly so it does not lose more quality with every save.
- WebP to JPG Converter Images saved from websites are often WebP, which some older apps, editors and upload forms still refuse.
- JPG to WebP Converter Convert JPG (and PNG) images to WebP to make web pages lighter.
- Crop Image Cut an image down to the part you want.
- Rotate and Flip Image Turn a sideways photo the right way up, or mirror an image.
- Image to Base64 Turn an image into a Base64 data URI you can paste straight into HTML, CSS, Markdown or JSON — or paste Base64 to see and download the image it contains.
- SVG to PNG Converter Turn SVG icons, logos and illustrations into PNG images at the resolution you need.
- Image Color Picker Upload an image and click any pixel to get its exact colour in HEX, RGB and HSL.
- Image Splitter Split one picture into a grid of smaller images.
- Image Stitcher Combine screenshots, photos or pages into a single image — stacked vertically into one long picture, or side by side.
- Add Watermark to Image Protect photos before sharing them.
- Screenshot Beautifier Make a screenshot look presentable in seconds.
- ID Photo Maker Turn any clear head-and-shoulders photo into a correctly sized ID photo.
- Passport Photo Maker Take a photo against a plain wall, crop it to the passport or visa size you need with head guides, switch the background to white, and download a digital copy or a 4×6 inch print layout.
- GIF Maker Combine several images into an animated GIF, such as a before-and-after, a step-by-step demo or a simple slideshow.
- Blur or Pixelate Part of an Image Share screenshots and photos without exposing private details.
- Add Text to Image Caption a photo, label a screenshot or make a meme.
- SVG Optimizer Compress SVG files with SVGO in your browser.
- HEIC to JPG Converter iPhones save photos as HEIC, which many programs and websites cannot open.
- Online Document Scanner No scanner at hand?
- Online Signature Maker Need a signature image for a contract or form?
- Social Media Image Resizer Every platform wants a different shape, and uploading the same picture everywhere gets it cropped badly.
- Photo to Sketch Want a selfie, pet photo or landscape to look hand-drawn, or a line drawing for kids to colour in?
- Photo Resizer for Online Forms Application portals often ask for something like "413 × 531 pixels, 20–50 KB, 300 DPI", while phone photos are several megabytes.
- Change Image DPI A print shop or application form wants "300 DPI" and rejects a perfectly sharp photo?
- Remove White Background A logo on a white box, a photographed signature, a scanned stamp — and you need it on a document or another background.
- Photo Collage Maker Travel shots, food photos or a before-and-after?
- Split GIF into Frames Need one frame of an animated GIF as a still picture, or every frame to edit and reassemble?
- Compress GIF GIF too big for a chat app, forum or email?
- Crop Image to Circle Make a round profile picture for social media, a team page or a chat app.
- Add Border to Image Give a photo or screenshot a clean frame — a white border for social media, a thin dark line for a document, or rounded corners for a modern look.
- Pixel Art Converter Turn a photo, avatar or logo into retro pixel art.
- Bead and Cross Stitch Pattern Generator Make a Perler or Hama bead pattern, or a cross stitch chart, from a photo, cartoon or logo.
- Image to ASCII Art Turn a photo, logo or drawing into a picture made of text characters — for a code comment, a terminal banner, a README or just for fun.
- PNG to SVG Converter Turn a PNG or JPG logo, icon, drawing or signature into a scalable SVG.
- Photo Filter Editor Turn a photo black and white, give it a vintage sepia look, or simply fix a picture that is too dark or flat.
PDF 34 tools
- Merge PDF Combine PDF files into a single document in the order you choose, optionally keeping only certain pages from each.
- Compress PDF Shrink a PDF to email it or upload it to a form with a size limit.
- Split PDF Break a PDF into separate files — every page on its own, every N pages, or custom ranges like "1-3, 4-10".
- JPG to PDF Converter Combine photos, scans and screenshots into one PDF — one image per page, in the order you choose, on A4, Letter or pages that match each image.
- PDF to JPG Converter Turn PDF pages into JPG or PNG images — for slides, social posts, previews or apps that do not open PDFs.
- Organize PDF Pages See every page of your PDF as a thumbnail, then drag pages into a new order, rotate the ones that are sideways and delete the ones you don't need.
- Rotate PDF Fix sideways or upside-down pages for good.
- Delete Pages from PDF Remove blank pages, ads, cover sheets or anything else you don't want to send.
- Extract Pages from PDF Pull the pages you need out of a long PDF into a new file.
- Add Page Numbers to PDF Stamp page numbers on a PDF in the corner and style you want.
- Add Watermark to PDF Mark a PDF as a draft, confidential, or for one purpose only.
- Edit PDF Metadata PDF files carry hidden document properties such as the author's name, the software used and when the file was created.
- Sign PDF Fill in the signature line without a printer or scanner.
- PDF to Text Converter Pull the text out of a PDF to quote it, translate it or reuse it elsewhere.
- Unlock PDF Save a password-protected PDF as a copy without the password so you never have to type it again — as long as you know it.
- Protect PDF Add a password to a PDF before sending contracts, reports or other sensitive files, or just restrict printing, copying and editing so the file can be read but not changed.
- Compare PDF Files What did the other side change in the contract?
- PDF to Markdown Dropping a raw PDF into an AI chat often mixes in headers, footers, page numbers and broken lines.
- PDF N-up (Multiple Pages per Sheet) Printing slides or handouts one page per sheet wastes paper.
- Crop PDF Wide margins make papers and e-books tiny on a phone, and scans often have dark edges or punch holes.
- Convert PDF to Grayscale Running out of colour ink, or a submission has to be black and white?
- Redact PDF Sending a contract, CV or medical record and need to hide ID numbers, phone numbers or amounts?
- Extract Images from PDF Want the photos or illustrations from a PDF without blurry screenshots?
- PDF to Long Image Sharing a PDF in a chat app where people won't open attachments?
- Merge Duplex Scans (Interleave PDF) Your scanner only does one side, so you scanned the fronts, flipped the stack and scanned the backs — and now the pages are out of order.
- Resize PDF Pages (A4 / Letter) Merged a scan, a Word export and a US Letter form into one PDF and now every page is a different size?
- Add Blank Pages to PDF Need a blank page after every slide for handwritten notes, an even page count so the next document in a duplex print job starts on a new sheet, or a page count that is a multiple of 4 for a booklet?
- Fill PDF Form Got an application, tax or registration form as a fillable PDF but no PDF editor?
- Verify PDF Signature Got a signed contract, invoice or certificate as a PDF?
- Add Stamp to PDF Add a company stamp, seal or an "APPROVED" mark to a PDF without printing it.
- Add Bookmarks to PDF Add clickable bookmarks to a thesis, a scanned book or a merged bundle of PDFs.
- Repair PDF When a PDF says "the file is damaged and could not be repaired" or an upload form refuses it, often only the file structure is broken and the content is still there.
- Flatten PDF / Remove Annotations Sending a reviewed contract or paper and want the highlights and comments gone?
- Remove Blank Pages from PDF Duplex scanning turns every empty back side into a page, and converting from Word sometimes adds blank pages.
Video & Audio 20 tools
- Online Screen Recorder Capture a demo, a bug report or a short tutorial without installing anything.
- Online Voice Recorder Record a voice memo, a quick narration or a practice take without installing an app.
- Video to GIF Converter Choose a video, mark the part you want and turn it into a looping GIF for chats, docs or bug reports.
- Online Metronome A metronome for practising an instrument or singing that works as soon as the page opens.
- Text to Speech Online Paste some text, choose a voice, set the speed and pitch, and have it read aloud.
- Trim Video Need just part of a video?
- Video Converter (to MP4) An iPhone MOV or a downloaded MKV won't play on another device?
- Remove Audio from Video Background noise, someone talking, or you just want silent footage?
- Extract Audio from Video Want the song, lecture or recording from a video on its own?
- Video Frame Extractor Player screenshots are often blurry and miss the moment.
- Audio Cutter (Ringtone Maker) Want the chorus of a song as a ringtone, or to cut the noise at the start of a recording?
- Merge Audio Files Lessons recorded in parts, a medley of songs, several voice notes in a row — drop the files in, put them in order, choose how they join and get one file.
- Audio Volume and Loudness Normalizer Recording too quiet, songs jumping in volume, or a podcast that must meet a platform's loudness target?
- Change Audio Speed and Pitch Slow down a fast listening exercise, lower a song by two semitones to sing along, or save a lecture at 1.5× — set the speed and pitch, preview the first 20 seconds and export the whole file when it sounds right.
- Online Teleprompter Recording a talking-head video, going live or giving a speech and can't remember the words?
- Audio Converter Your phone won't play FLAC, your editor wants WAV, or you want a sound reversed or looped?
- Merge Videos Recorded a talk, a match or a trip in several clips?
- Online Piano Play a piano right in your browser — no app or download.
- Online Voice Changer Make your voice sound like a chipmunk, a robot or a deep-voiced narrator.
- Guitar Chord Chart Pick a root (C, D, E…) and a chord type (major, minor, 7th, sus4…) and you get the ways to play it — open chords first, then movable barre shapes.
Text 32 tools
- Word Counter Paste or type text to count words, characters, sentences and paragraphs instantly, see the reading time, and check against common limits such as X posts and meta descriptions.
- Case Converter Paste text once and get it in every case at the same time — UPPER, lower, Title Case, Sentence case — plus programming styles like camelCase, PascalCase, snake_case, kebab-case and CONSTANT_CASE.
- Diff Checker Compare two pieces of text or code and see exactly what was added, removed or changed — side by side or inline, by line, word or character.
- Lorem Ipsum Generator Create dummy text for mockups, templates and layouts — any number of paragraphs, sentences or words.
- Simplified and Traditional Chinese Converter Convert Chinese text between Simplified and Traditional characters.
- Chinese to Pinyin Converter Turn Chinese characters into Hanyu Pinyin.
- Remove Duplicate Lines Paste a list and get every line only once.
- Sort Lines Put any list in order.
- Full-Width and Half-Width Converter Full-width letters and digits come from Chinese, Japanese and Korean input methods and break searches, forms and code.
- URL Slug Generator Turn a page title into a clean, readable URL slug like how-to-bake-bread.
- Morse Code Translator Type a message to see it in dots and dashes, or paste Morse code to decode it.
- Subtitle Converter Turn SRT into WebVTT for HTML5 video, ASS into SRT for players that ignore styling, or any subtitle file into plain text for a transcript.
- Subtitle Timing Shift Subtitles a second behind the audio, or drifting further off as the film goes on?
- Markdown Editor Write on the left, see the formatted result on the right as you type.
- Fancy Text Generator Type once and see your text in over twenty Unicode styles, from 𝐛𝐨𝐥𝐝 and 𝓬𝓾𝓻𝓼𝓲𝓿𝓮 to Ⓑⓤⓑⓑⓛⓔ and ʇxǝʇ uʍop ǝpısdn.
- Typing Speed Test How fast can you type?
- Title Case Converter Each style guide capitalizes titles differently — which prepositions, articles and conjunctions stay lowercase, and whether the last word is capitalized.
- Markdown Table Generator Copy a table from Excel, Google Sheets or a web page and paste it here to get a Markdown table.
- Word Frequency Counter Paste an article, abstract, reviews or survey answers to see every word ranked by how often it appears, with counts, percentages and a cloud of the top words.
- Copy and Paste Symbols A collection of the special characters people reach for most — arrows →, math symbols ≈ ≤ √, circled numbers ①②③, superscripts ², currency ¥ €, units ℃, check marks ✓ ✗, stars ★, hearts ♥, shapes ▲ ●, Greek letters, pinyin tone marks and box-drawing characters.
- Word to Markdown Copying from Word into an AI chat often mangles the formatting, and uploading files has size limits.
- Token Counter and Text Splitter AI chats have a length limit, and going over it truncates the text or fails.
- Markdown to Mind Map Ask an AI for an outline, paste it here and it becomes a mind map.
- Handwriting Worksheet Generator Type the words your child is learning, or your own practice sentences, and get a printable tracing sheet.
- Chart Maker Don't want to wrestle with Excel charts, or need a quick chart for slides or a report?
- Printable Graph Paper Need a sheet of graph paper right now?
- Word Search Maker Turn any word list — spelling words, vocabulary, names for a party — into a printable word search.
- Printable Flashcard Maker Paste your words and answers — two columns from Excel or Google Sheets, or one “front - back” pair per line — and get a PDF of flashcards ready to print and cut.
- Certificate Maker Pick a style, enter your names and awards, and get one certificate per person, ready to download as a PDF or print.
- Address Label Maker Choose your label sheet, paste your addresses, and each one is placed on its own label, ready to download as a PDF and print on any office printer.
- Name Tent Maker Paste your attendee list and each person gets a name tent.
- Name Badge Maker Paste your attendee list and get one badge per person, laid out to fill the sheet with cut lines.
Developer 63 tools
- JSON Formatter & Validator Paste JSON to pretty-print it, minify it, or find exactly where it is broken — with the line, column and a plain-language reason.
- JSON Compare See exactly what changed between two versions of a JSON config, API response or data file.
- Password Generator Create strong, random passwords with a cryptographically secure generator.
- UUID Generator Generate unique IDs in bulk — random UUID v4, time-sortable UUID v7 and ULID, or short Nano IDs — and inspect any UUID to read its version, variant and embedded timestamp.
- JWT Decoder Paste a JSON Web Token to see its header and payload, check whether it has expired, and verify the signature with a secret or public key.
- Regex Tester Write a regular expression, see every match highlighted as you type, inspect capture groups and try out replacements.
- Cron Expression Parser Paste a cron expression to see what it means in plain words and exactly when it will run next, in your time zone or the server's.
- JSON to YAML Converter Turn JSON into clean YAML for Kubernetes manifests, Docker Compose, CI pipelines and application config.
- YAML to JSON Converter Convert YAML config — Kubernetes manifests, Compose files, CI pipelines — into JSON for APIs and tools that only accept JSON.
- JSON to CSV Converter Turn a JSON array — an API response, a database export — into a CSV file that opens in Excel, Numbers or Google Sheets.
- CSV to JSON Converter Paste CSV exported from Excel, Google Sheets or a database and get a JSON array ready for an API or a script.
- Binary, Decimal & Hex Converter Enter a number in any base from 2 to 36 and see it in binary, octal, decimal, hexadecimal and a base of your choice at once.
- Color Converter & Contrast Checker Paste a color in any CSS format to get it as HEX, RGB, HSL, HSV, CMYK and OKLCH, check its contrast against a background for WCAG accessibility, and generate a matching light-to-dark shade scale.
- JavaScript Formatter Paste minified or messy JavaScript and get clean, consistently formatted code.
- CSS Formatter Turn minified or messy CSS into readable, consistently indented style sheets.
- HTML Formatter Make HTML readable again.
- XML Formatter Paste minified or single-line XML and get properly indented, readable output.
- SQL Formatter Turn long one-line queries into readable SQL with each clause and column on its own line.
- YAML Formatter Clean up YAML with consistent two-space indentation and spacing, and find syntax errors before they break a deployment.
- JavaScript Minifier Shrink JavaScript for production.
- CSS Minifier Compress style sheets for production.
- JSON to TypeScript Converter Turn a JSON sample — an API response, a config file, a fixture — into TypeScript interfaces you can paste into your code.
- JSON to Go Struct Converter Paste JSON and get Go struct definitions with json tags, ready for encoding/json.
- JSON to Pydantic Model Converter Paste JSON and get Pydantic models you can use to validate and parse data in Python.
- JSON to Rust Struct Converter Paste JSON and get Rust structs ready for serde_json.
- JSON to JSON Schema Generator Paste a JSON sample and get a JSON Schema describing it — types, nested objects, array items and which keys are required.
- IP Subnet (CIDR) Calculator Enter an address with a prefix like 192.168.1.10/24 to get everything about the network — addresses, masks, host range and size — for IPv4 and IPv6.
- Chmod Calculator Tick the read, write and execute boxes for owner, group and others to get the numeric and symbolic permission and the chmod command — or type 755 or rwxr-xr-x to see what it means.
- User Agent Parser Find out what your browser reports about itself, or decode a User-Agent string from server logs to see the browser, operating system and device behind a request — and spot search engine crawlers and scripts.
- HTTP Status Codes A complete, searchable list of HTTP response status codes.
- HTML to Markdown Converter Paste HTML source, or copy a section of any web page or document and paste it here, formatting and all.
- Excel to CSV Converter Open an .xlsx, .xls, .ods or Numbers file, choose a sheet and get CSV with the values exactly as they appear in Excel.
- Excel to JSON Converter Turn a spreadsheet into JSON you can use in code or an API.
- CSV to Excel Converter Paste CSV or open a .csv file and download a proper .xlsx workbook.
- JSON to Excel Converter Paste a JSON array, such as an API response, and download it as an .xlsx workbook.
- cURL to Code Converter Paste a curl command, for example one copied from your browser's developer tools, and get the same request as ready-to-run code.
- CSS Gradient Generator Build a gradient background by eye instead of by trial and error.
- XML to JSON Converter Turn an XML document, feed or API response into JSON you can use in JavaScript or any modern API.
- JSON to XML Converter Produce XML from JSON for older APIs, configuration files or SOAP-style integrations.
- JSON to TOML Converter Turn JSON into TOML for Rust's Cargo.toml, Python's pyproject.toml, Hugo and application config.
- TOML to JSON Converter Convert TOML config to JSON to process it in code or check the real structure of files like Cargo.toml and pyproject.toml.
- ULID Generator Generate ULIDs (Universally Unique Lexicographically Sortable Identifiers) in bulk for database keys, logs and message IDs, or paste a ULID to see when it was created.
- Nano ID Generator Generate Nano IDs, random IDs that are shorter than UUIDs and safe to put in a URL — handy for short links, file names, component keys and database keys.
- SSH Key Generator Generate an SSH key pair in your browser for server logins or GitHub and GitLab deploy keys.
- JSONPath Tester Type a JSONPath expression to pull data out of JSON and see the matching values, and the full path of each match, as you type.
- docker run to Docker Compose Paste one or more docker run commands to get the equivalent compose.yaml.
- Docker Compose to docker run Paste a compose.yaml or docker-compose.yml to get an equivalent docker run command for every service — handy for starting a container on a machine without Compose, or for checking exactly how a service is started.
- Mermaid Live Editor Draw flowcharts, sequence diagrams, Gantt charts and more from a few lines of text.
- Nginx Config Generator Enter your domain, pick the kind of site and tick the features you need to get a ready-to-use nginx server configuration.
- SQL Playground Write SQL without installing a database.
- Run JavaScript Online Paste or write JavaScript and click Run to see console.log, warn and error output — for trying snippets, practising algorithms or debugging a bit of logic.
- Color Contrast Checker Enter a text colour and a background colour to get the WCAG contrast ratio and see whether normal and large text meet AA and AAA.
- HTML, CSS and JavaScript Playground Write HTML, CSS and JavaScript on the left and watch the result update on the right, with a console below showing console.log output and script errors.
- Common Regex Patterns Ready-to-use regular expressions for everyday validation — email, URL, domain, IPv4 and MAC addresses, integers, decimals and money amounts, dates and times, usernames, strong passwords, hex colors, UUIDs and semantic versions, plus Chinese phone, ID and postcode formats.
- SLA & Uptime Calculator 99.9% availability allows about 43 minutes of downtime a month; 99.99% only about 4.
- RAID Calculator Before building a NAS or server array, see how much space four 8 TB disks give you in RAID 5 versus RAID 6 and how many can fail.
- Unzip Online Got a RAR or 7z file on your phone and nothing to open it with?
- Merge and Split Excel Files Collecting reports from every team into one sheet, or breaking a master list up by department, are two of the most tedious Excel chores.
- VLSM Calculator Planning an office network, a homelab or a networking exam?
- systemd Service File Generator Keep a Node.js, Python or Go program running on a Linux server, start it at boot and restart it when it crashes — without remembering every systemd option.
- Firewall Rule Generator Open the ports your server needs and close the rest without looking up three different syntaxes.
- Compare Excel Files Two versions of a list, two months of stock figures, a revised price sheet — what changed?
- Color Palette Generator Press Generate (or the space bar) for a fresh palette.
Encoding & Hashing 13 tools
- Base64 Encoder & Decoder Convert text or any file to Base64, or decode Base64 back to readable text or the original file.
- URL Encoder & Decoder Encode text for use in a URL, decode %-escaped strings back to readable text, and see any URL split into its parts and query parameters.
- HTML Entity Encoder & Decoder Escape text so it displays safely inside HTML, decode entity-filled text back to readable characters, or convert characters to Unicode escape sequences for JavaScript, JSON and CSS.
- Unicode Escape Converter Turn text into \uXXXX escapes for code and JSON, or decode escaped sequences back into readable text.
- Text to Hex Converter See the UTF-8 bytes behind any text as hexadecimal, or paste hex to decode it into text.
- Text to Binary Converter Translate words into ones and zeros, or decode a binary message back into text.
- Punycode Converter Domain names with non-ASCII characters are stored in DNS as Punycode, which starts with xn--.
- Hash Generator Calculate MD5, SHA-1, SHA-2, SHA-3, BLAKE2, BLAKE3 and RIPEMD-160 hashes of text or files, generate HMACs with a secret key, and check a download against its published checksum.
- MD5 Hash Generator Get the 32-character MD5 hash of any text or file.
- SHA-256 Hash Generator Compute the 64-character SHA-256 hash of text or any file, and compare it with the checksum a website publishes to confirm a download is genuine and complete.
- Encrypt Text or Files with a Password Protect a note, a set of credentials or a file before you send or store it.
- Bcrypt Generator and Checker Create a bcrypt hash for a password, or check whether a password matches an existing bcrypt hash — useful when debugging logins or seeding an admin password.
- ASCII Table All 128 standard ASCII characters with their decimal, hexadecimal, octal and binary codes and HTML entity.
Date & Time 35 tools
- Time Zone Converter Pick a date and time in one place and see it everywhere else at once.
- Days Between Dates Find out how many days there are between two dates — for deadlines, holidays, contracts or countdowns.
- Date Calculator What date is 90 days from today?
- Age Calculator Enter a date of birth to get the exact age today, or on any other date — in years, months and days, with the total number of days lived and a countdown to the next birthday.
- Unix Timestamp Converter Convert a Unix timestamp to a readable date, or a date to a timestamp, in any time zone.
- Chinese Lunar Calendar Converter Find the lunar date of any day, or the Gregorian date of a lunar birthday or festival.
- Online Countdown Timer Set a countdown for cooking, workouts, exams or meetings.
- Online Stopwatch Time runs, speeches or experiments to the hundredth of a second.
- Business Days Calculator Find how many working days fall between two dates, or which date is a given number of working days before or after another.
- What Week Is It? See today's week number, the day of the year and how many days are left.
- Hours Calculator Work out how many hours you worked from your start and end times.
- The 24 Solar Terms See the current and next Chinese solar term, then choose a year from 1901 to 2099 for a complete table of dates and transition times in Beijing time (UTC+8).
- Add or Subtract Time Calculator Start with a clock time, choose add or subtract, and enter a duration.
- Zodiac Sign Calculator Enter your date of birth to get both your Western star sign and your Chinese zodiac animal.
- Pomodoro Timer Work in Pomodoro rounds — focus for 25 minutes, take a 5-minute break, and take a longer break after every four rounds.
- Days Until Countdown See at a glance how many days are left until Christmas, New Year’s Day, Thanksgiving, Mother’s Day, Halloween or Chinese New Year.
- Printable Calendar 2027 with Holidays Pick a year and a layout and get a calendar ready to print — the whole year on one page, or one month per page with roomy boxes to write in.
- Day of the Week Calculator Pick any date to see what day of the week it falls on, together with its week number, day of the year and how many days from today.
- Large Print Calendar A normal year-at-a-glance calendar squeezes twelve months onto one page and the numbers are tiny.
- Printable Desk Calendar Make your own desk calendar instead of using a promotional one.
- World Clock What time is it right now in London, Sydney or Los Angeles?
- Sunrise and Sunset Times When does the sun rise and set today?
- Moon Phase Calendar Check tonight's moon phase, find the next full moon, or list every full and new moon of the year.
- Sun Position Calculator Pick a city and date, then drag the time slider to see the sun's elevation angle, compass direction and how long shadows are.
- Exact Time and Clock Accuracy Check Open the page to see the exact time, corrected to the millisecond, and how far off your device clock is.
- ISS and Satellite Pass Predictor Pick a city or use your location to see when the International Space Station (ISS) or China’s Tiangong station passes over in the next 10 days — where it appears, how high it gets and whether you can see it with the naked eye.
- Star Map Generator: The Sky on a Special Date Pick a date that matters — a birthday, the night you met, your wedding — add the time and city, and get the real sky above you at that moment.
- Printable Weekly Planner Print a weekly planner that fits how you work — a box for every day, a list of top priorities and space for notes.
- Printable Habit Tracker Build habits one tick at a time.
- Christmas Countdown How long until Christmas?
- Class Schedule Maker Set your days and periods, type in your classes, and each subject gets its own color automatically.
- Chore Chart Maker Add your child's name and daily chores to make a one-week chart for the fridge.
- New Year Countdown Count down to the New Year with a big live clock — days, hours, minutes and seconds until midnight on 1 January in your own time zone.
- Holiday Countdown How many days until the next holiday?
- Shift Schedule Maker Build a rotating shift schedule for a factory, ward, security team or shop, or a simple daily duty rota.
Finance 25 tools
- Loan and Mortgage Calculator Enter the amount, interest rate and term to see the monthly payment, the total interest and a month-by-month schedule.
- Compound Interest Calculator Find out what an initial amount plus regular savings will be worth after a number of years.
- Loan Prepayment Calculator Thinking of paying a lump sum off your mortgage or loan?
- APR Calculator A plan that charges 0.6% a month sounds like 7.2% a year, but the real rate is close to 13%.
- Interest Rate Converter Turn a daily rate into an annual one, or a monthly rate into a yearly APR.
- Savings Interest Calculator See how much interest a deposit will earn.
- Monthly Investment Calculator Investing 1,000 a month at an 8% annual return grows to about 184,000 in ten years.
- Discount Calculator What is 20% off 299?
- Profit Margin Calculator Buy at 60 and sell at 100 and your margin is 40% — but your markup is 66.7%.
- China Individual Income Tax Calculator Work out your take-home pay in mainland China.
- VAT and Sales Tax Calculator Take 20% VAT out of 120 and you get 100 net and 20 tax.
- Tip Calculator Enter the bill, pick a tip percentage and say how many people are paying.
- Inflation Calculator Enter an amount, an annual inflation rate and a number of years to see what the same goods could cost in the future and what the same money would be worth in today's terms.
- Credit Card Number Validator Enter a credit or debit card number to check its format and Luhn checksum.
- Currency Converter Enter an amount and pick currencies to convert at the European Central Bank’s daily reference rates, with the amount in other common currencies listed too — handy for travel, shopping abroad and quotes.
- Salary to Hourly Calculator Enter an amount and say whether it is per hour, day, week, month or year, and every other figure appears instantly.
- Car Loan Calculator Look beyond the monthly payment.
- XIRR Calculator When money goes in and comes out at different times, "total profit ÷ total invested" is misleading.
- Savings Goal Calculator Saving for a house deposit in five years or a car in three?
- Stock Profit Calculator Commissions eat into small trades.
- CAGR Calculator Your investment grew from 10,000 to 20,000 in five years — what is that per year?
- Rent vs Buy Calculator Buying builds equity but ties up a down payment and comes with interest, fees and upkeep.
- FIRE Calculator FIRE — Financial Independence, Retire Early — means having enough invested that its returns can pay for your life.
- Break-Even Calculator Starting a small business, a market stall or an online shop?
- Invoice Generator Make a clean invoice, receipt or quote without hunting for a template.
Health 29 tools
- Body Fat Calculator Estimate body fat with just a tape measure.
- Child Growth Percentile Calculator Find where a child's height and weight fall compared with other children of the same age and sex.
- BMI Calculator Enter your height and weight to get your body mass index, the category it falls in, and the weight range that counts as healthy for your height.
- Child Height and Weight Chart See the usual height and weight range for every age from birth to 20.
- Calorie Calculator Find out roughly how many calories your body uses each day and how many to eat to maintain, lose or gain weight.
- Height Chart for Kids Is your child short, average or tall for their age?
- Genetic Height Calculator Estimate a child's adult height from the mother's and father's heights.
- BMR Calculator Your basal metabolic rate (BMR) is the energy your body uses at rest to keep breathing, circulating blood and holding its temperature.
- Period and Ovulation Calculator Find out when your next period is due and which days you are most fertile.
- Running Pace Calculator Ran 5K in 25 minutes?
- Heart Rate Zone Calculator Find your five training zones from your age.
- Sleep Calculator Need to be up at 7?
- Blood Type Calculator A mother with type B and a father with type A — what can the baby's blood type be?
- Ideal Weight Calculator Enter your height and sex to compare four widely used ideal body weight formulas.
- Water Intake Calculator Enter your weight and daily exercise time for a rough daily water estimate.
- Pregnancy Due Date Calculator Find your estimated due date and how far along you are today.
- Waist Ratio Calculator Enter your height, waist and hip measurements to calculate waist-to-height ratio and waist-to-hip ratio.
- Calories Burned Calculator How many calories does a 30-minute run burn?
- Steps to Distance and Calories Your phone says 10,000 steps today — how far is that, and how many calories?
- Protein Intake Calculator How much protein do you need to build muscle, or to keep muscle as you age?
- Baby Age Calculator How many months old is your baby today, and when is the 100th day?
- Baby Formula Calculator How much formula should your baby drink?
- Color Blind Test Can you read the number hidden in the dots?
- Online Hearing Test How evenly do you hear low and high tones in each ear?
- BMI Calculator for Children and Teens Adult BMI categories do not apply to children, because a healthy BMI changes with age and differs for boys and girls.
- Online Vision Test This works like the tumbling E chart at an eye check — say which way the E points.
- Astigmatism Test The lines on this chart point in six directions and are all equally thick and dark.
- Nap Calculator Waking up halfway through a nap can leave you feeling worse than not napping at all.
- Sleep Debt Calculator Six hours on weeknights, then sleeping until noon on Saturday.
Calculators 40 tools
- Scientific Calculator A scientific calculator you can type a whole expression into or tap with the keypad.
- Percentage Calculator Five percentage questions in one place, each answered as you type — from finding 15% of a price to working out the original price before a discount.
- Statistics Calculator Paste scores, sales figures or measurements separated by commas, spaces or new lines.
- Unit Converter Convert any measurement in one place.
- Fraction Calculator Enter two fractions, pick an operation and get the simplified answer with every step shown — common denominator, numerators, simplifying and the mixed number.
- Length Converter Convert heights, distances and dimensions between metric and US units — centimetres to inches, feet to metres, miles to kilometres and more.
- GCF and LCM Calculator Enter two or more whole numbers to get their greatest common factor (GCF, also called GCD or HCF) and least common multiple (LCM).
- Paper Sizes Chart How big is A4, and how many pixels is it at 300 DPI?
- Weight Converter Convert body weight, parcel weight or recipe amounts between metric and US units — kilograms to pounds, ounces to grams, stones to kilograms and more.
- Fuel Economy and Trip Cost Calculator Convert mpg to litres per 100 km and back, and budget a road trip.
- Prime Factorization Calculator Enter a whole number to see its prime factorization in exponent form, such as 360 = 2³ × 3² × 5, drawn as a factor tree.
- Temperature Converter Convert oven, weather and body temperatures between Celsius and Fahrenheit, or scientific values in Kelvin, as you type.
- GPA Calculator Enter each course's credits and grade to get your credit-weighted GPA.
- Quadratic Equation Solver Enter a, b and c to solve ax² + bx + c = 0.
- Grade Calculator Enter your scores and how much each one counts to get your current weighted grade.
- Number to Words Converter Spell out any number in English for cheques, contracts, invoices or essays.
- Ratio Calculator Three ratio tools in one.
- Average Calculator Paste a list of numbers to get the average (arithmetic mean) with the working shown, plus the median, mode, count, sum and range.
- Roman Numeral Converter Type a number to see it in Roman numerals, or type Roman numerals to get the number.
- Font Size Converter Convert a font size between points (pt), CSS pixels (px), em/rem, percent and millimetres — for moving designs from Word or print to CSS and back.
- Area Calculator Pick a shape, enter its dimensions and get the area and perimeter immediately.
- Volume Calculator Pick a solid, enter its dimensions and get the volume and surface area immediately.
- Triangle Calculator Enter any three known values of a triangle, including at least one side, and get the missing sides and angles, the area, the perimeter and whether it is acute, right or obtuse.
- Aspect Ratio Calculator Enter the width and height of an image, video or screen to get its simplest aspect ratio and the nearest common ratio.
- Area Converter Convert the area of a room, a house or a plot of land between metric and imperial units — square feet to square meters, acres to hectares and more — with every unit listed at once.
- Volume Converter Convert volume and capacity between liters, milliliters, cubic meters, gallons, fluid ounces, cups and spoons — for recipes, fuel and tank sizes — with every unit listed at once.
- Speed Converter Convert speed between km/h, mph, m/s and knots — speed limits abroad, wind speed, boat speed or running pace — with every unit listed at once.
- Data Storage Converter Convert file and disk sizes between bytes, KB, MB, GB, TB and KiB, MiB, GiB, and turn Mbit network speeds into MB — so a “shrunken” drive or a slow download makes sense.
- Pressure Converter Convert pressure between psi, bar, kPa, MPa, atm and mmHg — tire pressure, gas cylinders, barometric pressure in weather reports and blood pressure readings.
- Energy Converter Convert energy between kcal, kJ, joules, kWh and BTU — turn the kilojoules on a nutrition label into Calories, or see how much energy a kilowatt-hour of electricity holds.
- Shoe Size Converter Buying shoes from another country and unsure what UK 7 or EU 41 means for you?
- Ring Size Converter The listing says US 7 or UK N — what's your size?
- Cups to Grams Converter The recipe says "1 cup flour, 2 tbsp butter" and you only have a scale?
- Dog and Cat Age Calculator "One dog year equals seven human years" isn't right — a one-year-old dog is already a teenager in human terms, and large dogs age faster than small ones.
- Concrete Calculator Pouring a patio, shed base, footing or post holes?
- Paint Calculator How much paint do you need for a bedroom or living room?
- Tile Calculator Tiling a bathroom or kitchen floor?
- Gravel Calculator Laying a gravel path, patio or driveway?
- Mulch Calculator Mulching a flower bed, border or tree ring?
- Topsoil Calculator Filling a raised bed, levelling a lawn or building up a garden bed?
Random 8 tools
- Random Number Generator Pick a random number between 1 and 100, draw lottery-style numbers without repeats, or generate thousands at once.
- Random Picker Wheel Type a list of names or choices, spin the wheel and let chance decide.
- Dice Roller Roll dice when the real ones are missing.
- Coin Flip Heads or tails?
- Random Team Generator Paste a list of names and split it into fair, random teams — for sports, classroom groups or workshops.
- Secret Santa Generator Organising a gift exchange for family, friends or the office?
- Bingo Card Generator Make a set of printable bingo cards in a minute — with your own words for a Christmas party, baby shower or classroom review, or with classic 75-ball numbers.
- Seating Chart Generator Paste your class list, set the number of rows and seats, and get a seating plan in one click.
Device Tests 27 tools
- Webcam Test Check that your camera works and looks right before a meeting or interview.
- Microphone Test Make sure your microphone works and sounds clear before a call or recording.
- Keyboard Tester Find keys that do not work, stick or register the wrong character.
- What Is My Screen Resolution? Your screen resolution and other display details, read straight from your browser.
- Dead Pixel Test Check a new monitor, laptop or phone for faulty pixels.
- Reaction Time Test Click to start, wait for the box to turn from red to green, then click (or press Space) as fast as you can.
- Stuck Pixel Fixer A dot that always shows red, green or blue may be a stuck pixel, and rapid colour flashing can sometimes bring it back.
- PPI Calculator How sharp is a 27-inch 1440p monitor compared with 4K?
- Click Speed Test (CPS) Click as fast as you can within the time limit to measure your clicks per second (CPS).
- Refresh Rate Test The refresh rate test starts as soon as the page opens, so you can see whether your 144 Hz or 165 Hz monitor, or your high-refresh phone, is really running that fast.
- Gamepad Tester Connect a controller and press any button to see every button, trigger and stick live.
- Mouse Test Click and scroll in the test area to see whether every button and the wheel respond.
- White Screen Turn your whole screen into a soft light — pure white, warm white, cool white or any colour, with adjustable brightness.
- Tone Generator Drag the slider or type a frequency and your browser plays it instantly.
- Left Right Audio Test Put on your headphones or turn on your speakers.
- White Noise Generator When you cannot sleep, the room is noisy or you need to focus, a steady noise hides the sudden sounds that bother you.
- Decibel Meter How loud is the building work upstairs, the traffic outside or the neighbour’s air conditioner?
- Mouse Polling Rate Test A higher polling rate means your mouse reports its position more often.
- Touch Screen Test Part of the screen not responding, missed taps while gaming, or just replaced the screen?
- Phone Sensor Test Motion controls behaving oddly, a compass spinning in your map app or auto-rotate not working?
- Monitor Gradient and Banding Test On a good monitor a gradient from black to white changes smoothly and you can see detail in both shadows and highlights.
- Guitar Tuner Play one string near your phone or computer microphone and the tuner shows the note, how far it is from the target in cents, and whether to tighten or loosen the string.
- Online Ruler (Actual Size) No ruler at hand but need to measure a screw, a photo or a ring?
- LED Scroller (Scrolling Text Sign) Meeting someone at the airport, cheering at a concert or saying hello through a car window?
- Ukulele Tuner Hold your phone near the ukulele and pluck one string.
- Bass Tuner Put your phone or computer near the amp or the bass and pluck an open string.
- Violin Tuner Put your phone near the violin and bow or pluck an open string.
Network 16 tools
- What Is My IP Address? See your current public IP address with its country, region, city and ISP as soon as the page opens, or enter another IPv4 or IPv6 address to find where it is.
- DNS Lookup Query a domain’s DNS records and TTLs to check website, email and certificate settings.
- WHOIS Lookup Enter a domain to see its registrar, registration and expiry dates, status and name servers — to check when it expires, whether transfers are locked, or whether it is registered at all.
- SSL Certificate Checker Enter a domain to check whether its HTTPS certificate is valid, how many days it has left, who issued it, which names it covers and whether the server sends the full chain — useful before and after renewals.
- HTTP Header and Redirect Checker Enter a URL to follow its redirects hop by hop and see each status code, response headers and timing, plus where it finally lands — for debugging HTTP-to-HTTPS and www redirects, loops, caching and security headers, or expanding short links.
- Open Graph and Meta Tag Checker Enter a URL to read its title, description, Open Graph and Twitter Card tags, preview how it appears in search results, large social cards and chat link previews, and find problems such as a missing share image, an overlong title, no canonical URL or an accidental noindex.
- SPF, DKIM, DMARC and MX Checker Enter a domain or an email address to look up its MX mail servers, SPF, DKIM and DMARC records in one go and check them for common mistakes — useful when mail lands in spam, when someone is spoofing your domain, or when you need to meet Gmail and Yahoo sender requirements.
- DNS Propagation Checker After changing an A, CNAME or MX record, check whether the new value is live.
- Open Port Checker Our server makes a TCP connection to the address you enter to see whether each port can be reached from the internet.
- SSL Certificate Decoder Paste a certificate (starting with -----BEGIN CERTIFICATE-----) to see what is inside — the names it covers, when it expires, who issued it and whether it is DV or OV.
- CSR Generator Certificate authorities ask for a CSR when you order an SSL certificate.
- Download Time Calculator How long will a 50 GB game take on a 300 Mbps line?
- Phone to Computer File Transfer (Browser AirDrop) No app, no account, no cable.
- Link Checker: Expand Short Links and Spot Phishing Got a text about a missed delivery, an unpaid toll or a locked account?
- NAT Type & IPv6 Test One click tells you your NAT type (NAT1 to NAT4), whether you have IPv6 and which protocol your browser uses when both work.
- Online Traceroute Enter a domain or IP and in about 3 seconds see every hop from our server to the target, with each hop's address, location, ISP and latency, plus which Chinese backbone the route uses (China Telecom 163 or CN2, China Unicom, China Mobile).
Academic 26 tools
- Citation Generator (APA, MLA, IEEE) Enter one or more DOIs, or paste BibTeX, RIS or EndNote exports from Zotero, Google Scholar or Web of Science, to build a reference list in APA, MLA, IEEE or GB/T 7714 style.
- BibTeX Formatter and Cleaner Paste BibTeX exported from Google Scholar, Zotero or a publisher’s site to get consistent indentation, field order and aligned equals signs, sort entries by key, year or author, remove duplicates and fields you don’t need such as abstract and file, and check for syntax errors, duplicate keys and missing required fields.
- LaTeX Table Generator Copy a table from Excel, Google Sheets or a web page and paste it here to get LaTeX code.
- LaTeX Equation Editor Type LaTeX or use the symbol palette to insert fractions, roots, sums, integrals, matrices and Greek letters, with a live preview.
- AoE Time Converter and Deadline Countdown Academic conferences often set deadlines in AoE (Anywhere on Earth), which is UTC−12.
- P-Value Calculator Got t = 2.31 with 18 degrees of freedom and need the p-value?
- T-Test Calculator Is the difference between two group means significant?
- Sample Size Calculator How many survey responses do you need, or how many participants per group in an experiment?
- Confidence Interval Calculator Need "mean 12.0 (95% CI 11.7–12.3)" for a paper, or the margin of error for a poll result?
- Chi-Square Test Calculator Do men and women answer a survey question differently?
- Correlation Coefficient Calculator Are height and weight related?
- Effect Size Calculator The journal wants effect sizes, but the paper only reports means and SDs, or a t or F value?
- One-Way ANOVA Calculator Do three or more group means differ?
- Mann–Whitney U Test Calculator When two samples are small and skewed, or the data are ratings or ranks, use the Mann–Whitney U test instead of an independent t-test.
- Wilcoxon Signed-Rank Test Calculator When the same people are measured twice (before and after, two conditions) and the differences aren't normal, use the Wilcoxon signed-rank test instead of a paired t-test.
- Linear Regression Calculator Paste your data with one column per variable and names in the first row, choose the dependent variable and the predictors, and get the regression equation plus the three tables SPSS prints — model summary, ANOVA and coefficients.
- Cronbach's Alpha Calculator Reporting scale reliability for a questionnaire?
- Normal Distribution Calculator Know the mean and standard deviation and want the share below a value, or between two values?
- Z-Score Calculator You scored 85 where the average was 75 and the standard deviation 8 — how good is that?
- Normality Test Calculator Before a t-test or ANOVA you are usually asked whether the data are normal.
- Periodic Table of Elements A clear, interactive periodic table with all 118 elements, colour-coded by category.
- Two-Way ANOVA Calculator When two grouping factors such as teaching method and gender affect one outcome, a two-way ANOVA tests each main effect and their interaction.
- Binomial Distribution Calculator The chance of exactly 5 heads in 10 coin tosses, or of at least 3 defects in a sample of 20, comes from the binomial distribution.
- Poisson Distribution Calculator If a shop gets 3.5 customers an hour on average, how likely are exactly 2?
- Sobel Test Calculator Testing whether X affects Y through a mediator M?
- Friedman Test Calculator When the same people are measured under three or more conditions or time points and the data aren't normal (or are ratings), use the Friedman test instead of a repeated-measures ANOVA.
SEO 11 tools
- Robots.txt Generator & Tester Generate: choose the paths to block, the crawlers to keep out and your sitemap URLs, and get a robots.txt ready to upload.
- XML Sitemap Checker Check your sitemap before submitting it — whether the XML parses, URLs are absolute, there are duplicates or other-host URLs, lastmod is well-formed and hreflang links point to each other.
- On-Page SEO Checker Enter any page URL to check the tags search engines care about most — title and description length, an accidental noindex, where the canonical points, how many H1s there are and whether hreflang includes the page itself — and preview the page in Google results.
- SERP Preview Preview your title tag and meta description as you write them.
- Access Log Analyzer Drop your server's access.log here to see within seconds which pages are popular, which URLs return 404 and which IPs hit you hardest.
- Crawler IP Verifier Scrapers often pretend to be Googlebot in their user agent.
- UTM Builder Tag the links in your newsletter, ads and social posts so analytics shows exactly which campaign brought each visitor.
- Schema Markup Generator (JSON-LD) Structured data tells search engines what a page is about — a product with its price, an article with its author and date, a shop with its address and opening hours.
- 301 Redirect Generator Moving to a new site structure or a new domain?
- XML Sitemap Generator Have a list of pages from your CMS, a spreadsheet or a crawl?
- llms.txt Generator llms.txt is a proposed standard file that gives AI assistants and LLM-based tools a short, Markdown guide to your site — what it is and which pages matter most.