How do I convert AVIF to WebP?

Add your AVIF file to the upload area above, then press Convert. The WebP 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 WebP reduce quality?

WebP 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

AVIF to WebP Converter

Turn AVIF files into WebP in a couple of clicks. Next-gen format with the best compression available today. Modern web format, ~30% smaller than JPG at similar quality. 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

AVIF files (.avif) · up to 120 MB each

or paste files from your clipboard

Ready when you are

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

⌘K to search converters

How to use it

1
Add your AVIF 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.

AVIF and WebP explained

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.

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.

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

AVIF vs WebP

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

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

AVIF is stronger at: The best compression of any broadly supported image format. Handles HDR and wide colour gamut. Supports transparency and animation.
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.

Why convert AVIF to WebP?

People make this switch when they run into the limits of AVIF: the file needs to be opened outside a browser, or you need fast bulk encoding. WebP is the better fit when you are publishing images on a website and want smaller files without a visible quality drop.

AVIF limitations that prompt the switch: Encoding is slow compared with JPEG or WebP. Desktop application support is still thin. Very low bitrates can smear fine detail in a distinctive way.
What you give up: Desktop applications and older software often cannot open it. Some photo printing services and older phones reject it.

Does converting AVIF to WebP 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.