How do I convert WebP to AVIF?

Add your WebP file to the upload area above, then press Convert. The AVIF file downloads straight to your device. You do not need an account, and there is no watermark.

Are my files uploaded to a server?

No. This conversion runs entirely inside your browser using WebAssembly, so the file never leaves your device — you can even disconnect from the internet after the page loads and it will still work.

Does converting to AVIF reduce quality?

AVIF uses lossy compression, so some data is discarded. At the default quality the difference is very hard to see or hear; raise the quality setting if you need to be certain, at the cost of a larger file.

How large a file can I convert?

Up to 120 MB per file for this conversion. Because the work happens in your browser, the practical limit is your device's memory — larger files work on a desktop with plenty of RAM and may fail on an older phone.

Can I convert several files at once?

Yes. Add as many as you like and press Convert All. Each file is processed independently, so one failure does not stop the rest, and you can download everything together as a ZIP.

Can I use this on my phone?

Yes. FileTools360 works in mobile browsers on iOS and Android, including choosing files straight from your camera roll. Very large videos may run out of memory on a phone — those are better converted on a laptop.

ImageAdjustable qualityRuns in your browser

WebP to AVIF Converter

Turn WebP files into AVIF in a couple of clicks. Modern web format, ~30% smaller than JPG at similar quality. Next-gen format with the best compression available today. The output is re-encoded, so quality depends on the settings you choose.

On your deviceNever uploadedGone when you close the tabHow this works

Drop your files here

WebP files (.webp) · up to 120 MB each

or paste files from your clipboard

Ready when you are

Drop a WebP file above and FileTools360 will turn it into AVIF — right here on your device, without uploading anything.

⌘K to search converters

How to use it

1
Add your WebP files
Drag them onto the upload area, choose them from your device, or paste them from your clipboard. You can queue several at once.
2
Adjust the settings if you want to
The defaults suit most people. Open Advanced to control quality, dimensions, rotation and metadata removal.
3
Convert and download
Press Convert. Everything happens on your own device — nothing is uploaded. Download files one by one, or grab them all as a ZIP.

WebP and AVIF explained

WebP is a Google-developed format that offers both lossy and lossless modes, transparency, and animation in one container. In its lossy mode it typically produces files around 25–35% smaller than JPEG at comparable visual quality.

AVIF stores still images using the AV1 video codec's intra-frame compression. It generally achieves the smallest files of any widely supported format, and it handles wide colour gamut and HDR, which JPEG cannot.

Where WebP files come from: Modern websites, and increasingly the default export from web-focused design tools.
Where AVIF is used: Performance-focused websites and modern image pipelines.

WebP vs AVIF

The two formats solve different problems, which is why converting between them involves trade-offs rather than a straight upgrade.

WebP compared with AVIF
Property	Source	Target
Compression	Lossy or lossless	Lossy or lossless
Transparency	Yes	Yes
Animation	Yes	Yes
Introduced	2010	2019
Browser support	All modern browsers. Some older desktop apps can't open it.	Modern browsers only. Limited desktop app support.

WebP is stronger at: Substantially smaller than JPEG at similar quality. Supports transparency, which JPEG cannot. Supports animation, replacing GIF at a fraction of the size.
AVIF is stronger at: The best compression of any broadly supported image format. Handles HDR and wide colour gamut. Supports transparency and animation.

Why convert WebP to AVIF?

People make this switch when they run into the limits of WebP: the file needs to be opened by arbitrary desktop software, emailed to non-technical recipients, or sent to a print shop. AVIF is the better fit when you control the audience (a modern website) and file size is the priority.

WebP limitations that prompt the switch: Desktop applications and older software often cannot open it. Some photo printing services and older phones reject it. Lossy WebP, like JPEG, degrades on re-save.
What you give up: Encoding is slow compared with JPEG or WebP. Desktop application support is still thin.

Does converting WebP to AVIF reduce quality?

Both formats store the content without discarding data, so this conversion preserves it exactly. The file size may change because the two formats compress differently, but the content itself is unaffected.

WebP is not always smaller. For simple graphics with few colours, a well-optimised PNG can still win.