WEBP to AVIF Converter

WEBP to AVIF runs entirely in your browser, so your images are never uploaded to a server. You almost certainly already have WebP files (downloaded from the web, exported by a CMS or build tool, or saved from a site) and you want to wring out the last bit of file-size savings by moving to the newer AVIF codec, usually to speed up page loads and improve Core Web Vitals (LCP), or because a build pipeline expects AVIF. This tool re-encodes those WebP bytes locally and hands you AVIF without a queue, a daily cap, or a forced signup.

What this conversion actually does (and does NOT do)

AVIF is built on the AV1 video codec, and at equal visual quality it is typically 20-50% smaller than WebP. That is the whole point of this specific conversion: even though WebP is already a modern, compressed format, re-encoding to AVIF still yields meaningful additional savings, with the largest wins on photographic content like hero images and product photography.

Both formats support alpha-channel transparency, and AVIF actually holds transparent edges slightly better than WebP at aggressive compression ratios, so converting logos, icons, and product cutouts is safe and clean. AVIF also supports 10-bit and 12-bit color depth plus HDR (PQ/HLG transfer functions), while WebP is 8-bit only. This converter writes 8-bit AVIF, which matches what a WebP holds: there is no extra depth to lose, and no HDR data is invented.

The big counterintuitive catch is animation. An animated WebP does NOT reliably survive the round-trip: most converters, this one included, flatten an animated WebP into a single static AVIF frame. Animated AVIF technically exists, but Safari still does not render it as of 2026, so animation belongs in WebP or MP4. If your file is an animated WebP, expect a single still frame out, and keep the original for the motion.

Two more honest notes. First, re-encoding lossy WebP to lossy AVIF is a second lossy pass, so quality can degrade if you set the slider too low; a reasonable AVIF quality (85 or higher for flat graphics and screenshots) avoids visible artifacts. This page always encodes lossy AVIF; there is no lossless AVIF option. Second, AVIF encoding is dramatically slower than WebP, roughly 5-10x and far more at maximum-compression settings, because AV1 intra-frame compression is computationally heavy. A few seconds per image, especially in bulk, is normal, not a broken tool.

When to choose WEBP to AVIF vs the alternative

Choose AVIF when you are optimizing photographic content for the web and want every kilobyte: photos and gradients compress far better in AVIF than WebP. For flat-color graphics, UI assets, and screenshots, WebP lossless is sometimes competitive with AVIF lossless, so the size win is smaller and you may prefer to leave those as WebP. Browser support in 2026 is WebP at roughly 97% versus AVIF at roughly 93% (Chrome 85+, Firefox 93+, Safari 16+, Edge 121+), which is why most production sites serve AVIF with a WebP or JPEG fallback through the <picture> element rather than dropping WebP entirely. If you need to go the other direction or test the fallback, see AVIF to WebP. For broad legacy compatibility, you can also export to a universal raster format from the image converter.

How to convert

1. Drop one or many WebP images. They are read locally in your browser, with no upload.
2. The output format is pre-selected to AVIF. The quality slider applies (90-95 for near-lossless, 75-85 for the web sweet spot).
3. For photographic sources, lean toward the lower end of the slider for bigger savings; for graphics and screenshots, raise it to avoid artifacts.
4. Click Convert. A single file downloads directly; multiple files download as a ZIP with no count cap.

No upload. It runs on your device.

The conversion engine is Rust compiled to WebAssembly and it runs inside your browser tab. There are zero network requests for the file itself, so your images never leave the machine. After the page loads once, you can turn off your wifi and it still works offline, and there is nothing to delete afterward because nothing was ever uploaded. You can verify this yourself: open your browser DevTools, watch the Network tab, and convert a file. WebP exports often hold proprietary client work, unreleased product photography, and brand assets, which is exactly the kind of content you should not be feeding to a random remote server.

No limits

Unlimited batch conversion, no file-size or file-count cap, no watermark on the output, no sign-up, and no ads. Server-based converters throttle bulk jobs and impose daily limits to push paid plans; because everything here runs on your hardware, the only limit is your own machine.

Frequently asked questions

Is converting WebP to AVIF worth it if my images are already WebP?

Yes, in most cases. AVIF is built on the AV1 codec and is typically 20-50% smaller than WebP at the same visual quality, so even an already-optimized WebP usually shrinks further. The gain is largest on photographic content and smaller on flat graphics, where WebP lossless can be competitive.

How much smaller is AVIF than WebP?

Expect roughly 20-50% smaller at equivalent visual quality, depending on the image. Photos and gradient-heavy images see the biggest reductions, while screenshots and flat-color UI assets see less because WebP already compresses those efficiently.

Does converting WebP to AVIF reduce image quality?

Re-encoding lossy WebP to lossy AVIF is a second lossy pass, so quality can degrade if you push the quality slider too low. Choosing a reasonable AVIF quality (85 or higher for graphics and screenshots) avoids visible artifacts while still capturing most of the size savings.

Does AVIF keep transparency from a WebP file?

Yes. Both WebP and AVIF support alpha-channel transparency, and AVIF actually preserves transparent edges slightly better than WebP at high compression ratios. That makes this conversion safe for logos, icons, and product cutouts.

What happens to an animated WebP when I convert it to AVIF?

An animated WebP does not reliably survive the conversion; it is flattened into a single static AVIF frame. Animated AVIF exists but Safari still does not render it as of 2026, so keep animation in WebP or MP4 and retain your original file.

Why is the WebP to AVIF conversion taking a few seconds per image?

AVIF encoding is dramatically slower than WebP, roughly 5-10x and far more at maximum-compression settings, because AV1 intra-frame compression is computationally heavy. A few seconds per image, especially in bulk, is the expected trade-off for the smaller output, not a sign the tool is broken.

Can I convert multiple WebP files to AVIF at once?

Yes. Drop a whole folder of WebP images and they convert in one batch with no file-count cap. A single file downloads directly; multiple files come back as a ZIP archive.

Are my images uploaded to a server when I convert here?

No. The conversion runs entirely in your browser via Rust compiled to WebAssembly, with zero network requests for the file. You can confirm it in your browser DevTools Network tab, and the tool keeps working offline after the first load.

Which browsers support AVIF in 2026?

AVIF is supported in Chrome 85+, Firefox 93+, Safari 16+ (since September 2022), and Edge 121+, reaching roughly 93% of users versus about 97% for WebP. Because of that gap, most sites serve AVIF with a WebP or JPEG fallback via the picture element.

Is there a file size or daily limit on conversions?

No. There is no file-size cap, no daily quota, no watermark, and no signup. Since processing happens on your own device rather than a shared server, the only constraint is your computer's memory and CPU.

Related tools: convert back with AVIF to WebP, explore the full image tools hub, or read why everything here runs locally in Rust and WebAssembly in the browser.