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Convert WebP to AVIF

Convert a WebP image to AVIF. AVIF is the most efficient image format a browser can display today, and it carries a full alpha channel.

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It is the right choice for a website you control. WebP was the previous answer to the same problem, and AVIF usually beats it - though by a narrower margin on flat graphics than on photographs.

How to convert WebP to AVIF

  1. Drop one WebP file or a whole folder of them onto the upload area.
  2. The page checks whether your browser can write AVIF before it converts.
  3. Compare the original and converted sizes.
  4. Download the AVIF, or the whole batch as a ZIP.

Supported formats

This tool accepts WebP files. Everything is decoded by your own browser, so the formats available depend on what your browser can open - which for HEIC in particular varies between Safari and other browsers.

Because the image is rebuilt from raw pixels, EXIF metadata such as camera details, timestamps and GPS coordinates does not carry into the result. Orientation is applied to the pixels first, so photographs stay the right way up. Embedded colour profiles are also dropped and the output is saved as sRGB, which can shift colours slightly in wide-gamut photographs. Animated files are refused rather than being flattened to a single frame.

Frequently asked questions

Is AVIF actually smaller than WebP?

Usually, but not always, and the gap is narrower than the one between AVIF and JPEG. AVIF tends to win clearly on photographs and detailed images; on flat graphics, small icons and images with large areas of a single colour, a well-compressed WebP is sometimes the smaller file. This page shows you both sizes after converting, so you can see the actual answer for your image rather than trusting a general rule.

The AVIF option is greyed out. Why?

Because your browser has no AVIF encoder, and this page asks it before offering the format rather than afterwards. Only Chromium-based browsers (Chrome, Edge, Opera, Brave) can write AVIF at the time of writing; Firefox and Safari display it but cannot create it. The alternative would be to let the conversion run and hand you a file called .avif that is really a PNG, which is what a browser returns when it is asked for a format it cannot write. Your WebP is unchanged - convert it in a Chromium browser, or pick a different target format here.

Can I convert a whole folder at once?

Yes. Add as many WebP files as you like and each one is decoded and written back out as a AVIF in turn, then downloaded together as a ZIP. Nothing about a WebP to AVIF conversion varies per file, so there is no setting to get wrong halfway through a batch. A file that is damaged or is not really a WebP is refused as you add it, named individually so you know which one, and the rest of the batch is unaffected.

Is my WebP uploaded anywhere?

No. Your browser decodes the WebP and writes the AVIF itself, using encoders it already ships with, so the file never leaves your device. That also means there is no size limit imposed by our bandwidth - only by how much of the decoded WebP your device can hold in memory at once, which is why a very large image can fail on a phone and succeed on a laptop.

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