File Converter

WebP to AVIF converter Free, private, no upload.

Convert WebP files to AVIF right in your browser. AVIF gives the smallest file sizes of any widely supported image format, which is great for websites and image-heavy apps. Your files are never uploaded.

or drop files anywhere · paste with Ctrl/⌘ + V

How to convert WebP to AVIF

  1. 1 Drop your WebP files onto the page, or click “Choose files”. You can add many at once, or a whole folder.
  2. 2 AVIF is already selected as the output. Optionally open Options to adjust quality, lossless, max width.
  3. 3 Click Convert, then Save. Converting several files? Save them all as one ZIP.

About the formats

WebP · WebP image

WebP is a modern image format from Google that is typically 25–35% smaller than JPG at the same visual quality, with optional transparency.

AVIF · AV1 Image File Format

AVIF is a next-generation image format based on the AV1 video codec. It often produces files half the size of JPG with better detail, and supports HDR and transparency.

The conversion runs on your device using jSquash (MozJPEG, OxiPNG, libwebp, libavif and libjxl) compiled to WebAssembly. You can adjust: quality, lossless, max width, max height, rotate, flip.

Frequently asked questions

How do I convert WebP to AVIF?

Drop your WebP files onto the page, or click “Choose files”. You can add many at once, or a whole folder. AVIF is already selected as the output. Optionally open Options to adjust quality, lossless, max width. Click Convert, then Save. Converting several files? Save them all as one ZIP.

Are my files uploaded to a server?

No. The conversion runs entirely in your browser using WebAssembly. Your files never leave your device, so it is safe for private photos, contracts and business data. Once the page has loaded it even works offline.

Will converting WebP to AVIF reduce quality?

AVIF uses lossy compression, so some detail is traded for a smaller file. At the default quality the difference is very hard to see or hear, and you can raise the quality setting if you need more.

Can I convert multiple WebP files to AVIF at once?

Yes. Add as many WebP files as you like; they are converted in parallel on your device and you can download them all as a single ZIP.

Is it free? Are there limits?

It is free, with no sign-up, no watermark and no daily limits. Because nothing is uploaded there is no upload size limit either; the only limit is your device’s memory, which matters mostly for very large videos.

Why do WebP images not open on my computer?

Older versions of Windows Photo Viewer, Photoshop and some office software cannot read WebP. Converting to PNG or JPG gives you a file that opens everywhere.

See everything the WebP converter and the AVIF converter can do.