Convert WebP to AVIF

Switch your WebP images to AVIF to reduce their size on your website even further, at comparable visual quality.

Drop your WebP files here

Or choose them, or paste an image (Ctrl + V or ⌘ + V).

Up to 20 files of 50 MB each (10 files of 30 MB on mobile).

The lower the quality, the smaller the file.

Longest side, proportions kept. Never enlarged.

Metadata (GPS location, camera, date) is always removed from the converted file.

    100% local processing, nothing is uploaded

    How does it work?

    WebP

    WebP, created by Google, was designed for the web. It offers lossy or lossless compression, transparency and animation, with files 25 to 35% smaller than a JPG of comparable quality. Every current browser reads it, but some older software (viewers, office programs, printing services) cannot open it yet.

    AVIF (AV1 Image File Format)

    AVIF is based on AV1, a royalty-free video codec. It is currently the most efficient image format on the web: often half the size of a JPG at equal visual quality, with transparency and a wide color gamut. Chrome, Firefox, Edge and Safari (since iOS 16 and macOS Ventura) display it; many programs outside the browser cannot read it yet. It is slower to encode than other formats.

    WebP or AVIF: which format should you choose?

    WebP is already an excellent web format, fast to encode and supported by more software than AVIF.

    Switch to AVIF if you want the smallest possible file: at comparable quality it is usually 20 to 30% smaller than WebP, and handles gradients (skies, plain backgrounds) better without banding. Ideal for large background images and full-screen photos.

    How does the conversion work?

    1. Drop your WebP files in the area provided, choose them or paste an image: several files at once if you like.
    2. Adjust the options if needed: they apply to every file in the list, which are converted again automatically.
    3. Download each AVIF file, or all of them at once in a ZIP archive.

    The conversion takes place in your browser. For your information:

    • The real format of each file is checked from its content, not its extension.
    • If your browser cannot create AVIF itself (Safari, for example), a free WebAssembly encoder takes over automatically.
    • The photo’s orientation is applied: the converted image displays the right way up everywhere.

    Examples

    Saving even more on a background image

    A 2,560 × 1,440 px WebP background image weighs 310 KB. As a quality 60 AVIF it drops to about 210 KB (−32%) and the sky gradient no longer shows bands.

    Optimizing a batch of images already in WebP

    Your website has 30 WebP images of about 200 KB. Converted together to AVIF, they drop to about 140 KB each: nearly 2 MB saved overall.

    Frequently asked questions

    Is AVIF always smaller than WebP?

    Almost always for photos and gradients. For small, very simple images (icons, flat colors), the difference can be small, or even in WebP’s favor: compare the sizes shown after conversion.

    Does converting an already compressed WebP degrade the image?

    Every lossy compression adds slight artifacts. If you have the original JPG or PNG, convert that instead. Otherwise, keep an AVIF quality of 65 or more.

    Are animated WebPs converted to animated AVIFs?

    No, only the first frame is converted. The animation is not kept.

    Can my browser create AVIF?

    Rarely on its own. The converter detects this and loads a free WebAssembly encoder when needed, so the conversion works in Chrome, Firefox and Safari, on computers and mobile devices alike.

    Are my WebP files uploaded to a server?

    No. The conversion runs entirely in your browser, on your device: your files are never uploaded, stored or viewed by anyone. You can check this in the “Network” tab of your browser’s developer tools: no file appears there. Metadata (GPS location, camera, date) is also removed from the converted file.

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