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ToolMug

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. Convert a whole folder at once; everything happens on your device.

Runs in your browser — nothing you enter is uploaded

Settings

85

Files process automatically with these settings. After changing settings, process existing files again.

or drop files here

You can also paste an image with Ctrl+V / ⌘V

Results

Results will appear here.

    How to use

    1. Choose the output format — JPG, WebP, AVIF or PNG.
    2. Add images by choosing files, dragging them in, or pasting from the clipboard. Conversion starts right away.
    3. Adjust quality or resize if needed, then click Convert again to reprocess.
    4. Download files one by one or all together as a ZIP.

    Options explained

    JPG
    Opens everywhere, but has no transparency — transparent areas are filled with white.
    PNG
    Lossless and supports transparency. Best for screenshots, logos and graphics; large for photos.
    WebP
    Smaller than JPG and PNG, supports transparency, displayed by all current browsers.
    AVIF
    The smallest files for photos, supports transparency and HDR. Encoding is slower, and some older software cannot open it.
    Quality
    Applies to JPG, WebP and AVIF. 80–90 keeps conversions visually faithful; lower values trade detail for size.

    Choosing a format

    If you need… Use
    Maximum compatibility (old software, printing services) JPG
    Transparency with perfect quality PNG
    Smaller files for a website WebP
    The smallest photos, modern browsers only AVIF

    Examples

    WebP to JPG — a product image saved from a website as .webp will not open in an older editor. Convert it to JPG at quality 90 and it opens anywhere.

    PNG to WebP — a 1.8 MB PNG screenshot becomes roughly a 150 KB lossless WebP with identical pixels.

    Frequently asked questions

    How do I convert WebP to JPG?

    Choose JPG as the output format and add your WebP files. Each is decoded by your browser and re-encoded with MozJPEG; download them individually or as a ZIP.

    Will I lose transparency?

    Only when converting to JPG, which does not support it — transparent pixels become white. PNG, WebP and AVIF keep the alpha channel.

    Does converting reduce quality?

    Converting to PNG, or to WebP/AVIF with Lossless ticked, keeps every pixel. Converting to a lossy format re-compresses the image; at quality 85 or higher the difference is rarely visible.

    Can I convert HEIC to JPG?

    Not yet. Most browsers cannot decode HEIC files, which is what an iPhone saves by default. On the iPhone you can switch to JPEG in Settings → Camera → Formats → Most Compatible.

    Is there a file limit?

    No fixed limit. Because processing happens on your device, very large images (over about 50 megapixels) may be slow on phones with little memory.

    Privacy

    This tool runs entirely in your browser. Your files and text are processed on your device and are never uploaded to our servers.

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