Convert WebP to AVIF
WebP and AVIF are two answers to the same question and AVIF is the newer one. WebP is built on VP8, a video codec from 2010; AVIF is built on AV1, roughly a decade newer, and at matched quality it generally compresses smaller. When a site or an image pipeline standardised on WebP and is now moving to AVIF to claw back more bytes, this is the conversion that does it.
Drop your WebP files below and download AVIF in seconds. Free, unlimited and completely private: the conversion runs inside your browser, so your files never leave your device and are never uploaded to a server.
No upload. Works with your network switched off. Check it yourself, or read what actually happens to your file.
Why convert WebP to AVIF?
It is worth knowing when this is not worth the trouble. The gap between WebP and AVIF is far narrower than the gap between JPG and AVIF, and on small or flat images AVIF's heavier container can make the output larger than the WebP you started with. There is generation loss to weigh up too: a lossy WebP has already discarded detail, and re-encoding compresses what remains a second time. Convert a couple of representative files and compare the before and after sizes before you put a whole library through it.
Google designed WebP to replace both JPG and PNG on the web, and it typically compresses 25 to 35 percent smaller at similar quality. It handles both lossy and lossless modes and supports transparency. Support is excellent in browsers but still patchy in older desktop software.
AVIF is based on the AV1 video codec and reaches even smaller files than WebP at the same visual quality. All modern browsers can display it, but many image editors and older tools cannot open it yet, which is the main reason people convert AVIF to an older format.
What this converter does to your WebP file
Your browser decodes the WebP, then libavif, compiled to WebAssembly and running on your device, encodes those pixels as AVIF. The encoder is about 3.4 MB and is fetched the first time you convert to AVIF rather than on page load. Both formats carry an alpha channel, so transparency survives, stored in the AVIF as a separate auxiliary image. The re-encode is lossy: the quality slider maps onto libavif's 0 to 100 scale, and colour is written as 8 bit with 4:2:0 chroma subsampling. An animated WebP does not stay animated, because this converter renders a single still frame, so you get the first frame only.
WebP vs AVIF at a glance
| WebP | AVIF | |
|---|---|---|
| Full name | WebP image | AV1 Image File Format |
| Compression | Lossy or lossless | Lossy or lossless |
| Transparency | Yes | Yes |
| Best for | Modern websites and apps | Next generation web images |
What changes when you convert WebP to AVIF
| What happens | |
|---|---|
| Image quality | Reduced. WebP is already lossy and AVIF compresses again, so this is a second encode. Nothing is recovered, and at low quality settings the losses stack. |
| Transparency | Kept. AVIF stores an alpha channel, so cut-out backgrounds and soft edges survive. |
| EXIF and GPS | Removed. The conversion goes through a pixel buffer, so camera data and location are not carried into the AVIF file. |
| Colour profile | Not carried across. The image is handled in sRGB, which is right for the web and wrong for colour-managed print work. |
| Animation | Not preserved. An animated WebP produces a single still frame. |
| File size | Smaller in almost every case, which is the reason for the conversion. How much smaller depends on the picture, so no figure is quoted here. |
How to convert WebP to AVIF
- Drop one or more WebP files into the box above, or click to browse.
- ImageConvert converts each file to AVIF right on your device.
- Download a single file, or grab everything at once as a zip.
Frequently asked questions
Will the AVIF actually be smaller than the WebP?
Usually, but the margin is narrower than people expect, and not every image wins. AVIF is the more efficient codec at photographic sizes and quality settings, while small icons and flat graphics can come out slightly larger because of AVIF's container overhead. The file list shows the size before and after each conversion, so check rather than assume.
Does an animated WebP become an animated AVIF?
No. This converter renders one still frame, so an animated WebP becomes a single frame AVIF of its first frame. AVIF can technically hold an image sequence, but producing one needs a dedicated animation tool that reads every frame.
What is a WebP file?
WebP is a modern format from Google that compresses smaller than JPG and PNG while keeping quality.
What is an AVIF file?
AVIF is a next generation format with excellent compression, increasingly used on modern websites.
Is it free to convert WebP to AVIF?
Yes. There are no limits, no watermarks and no account needed. Convert as many WebP files as you like.
Are my files private?
Completely. Your WebP files never leave your browser and are never uploaded to a server, so your images stay on your device.