How to convert WebP to AVIF
Add one or more WebP files, pick a quality level if the option is shown, and press Convert. Each image is decoded, redrawn on a canvas and saved again in the AVIF format. Converting several files at once is supported, and the results can be downloaded together as a ZIP archive.
WebP and AVIF compared
WebP is a modern web format from Google that offers both lossy and lossless modes and supports transparency. It usually produces smaller files than JPG or PNG at similar visual quality. It works best for website images where page speed matters, and is a weaker choice for workflows that still rely on very old software or e-mail clients.
AVIF is based on the AV1 video codec. It commonly reaches the smallest file size of the mainstream web formats and keeps transparency and wide colour. It is the better fit for modern websites that want the smallest possible images, while it is less suitable for older browsers and desktop software that cannot open the format yet.
Choosing a quality level
AVIF is a lossy format, so the quality slider decides the trade-off between file size and detail. Around 80–90 is a sensible range for photographs: the difference is hard to see, while the file is far smaller than at 100. Flat graphics with sharp edges usually need a higher setting, because lossy compression tends to blur hard edges.
What to check after converting
- Open the result at full size and look at edges, text and flat colour areas first — that is where compression artefacts appear.
- Compare the file size against the original. If a AVIF file is larger than the WebP source, lower the quality slider or reconsider the format.
- Check that the image dimensions are unchanged. Conversion never resizes an image; use the resizer tools for that.
Format support in browsers
Saving files relies on the image encoders built into your browser. PNG, JPG and WebP are available almost everywhere. AVIF encoding is only present in some recent browsers, and the tool will tell you clearly when the format you picked cannot be written on the device you are using, rather than producing a broken file.