About the WebP to AVIF
WebP was the format that sped up the web a decade ago. AVIF goes a step further and often makes the same picture another 20 percent smaller at similar quality. This tool converts still WebP images to AVIF in your browser, keeping transparency. Add one file or many, set the quality, and download them individually or as a ZIP. A real AVIF encoder runs on your device, so your images are never uploaded. It is meant for website owners, designers and anyone who wants the smallest possible picture files.
Updated October 2026
How to use the WebP to AVIF
- 1Choose your WebP images or drop them onto the page.
- 2Set the quality. 60% is a good balance for web use.
- 3Wait while each image is converted and sized.
- 4Download single files or press Download all for a ZIP.
- 5Compare file sizes with your originals before replacing them.
When to convert WebP to AVIF
If your site already serves WebP, AVIF is the next step for the biggest pictures: hero banners, product photos and galleries. Even a saving of 20 percent on dozens of images adds up to a visibly faster page, particularly on mobile networks.
Keeping quality under control
A WebP that was saved at 80 percent has already lost some detail. Converting it to AVIF at 60 percent will not look identical to the original, only close. If you still have the original JPG or PNG, converting from that gives a better result than going WebP to AVIF.
- Original available: convert from the original
- Only WebP available: use 65–75%
- Icons and small graphics: compare sizes first
Serving both formats
Use a picture element with AVIF first and WebP or JPG as a fallback, so every visitor gets a picture they can open. This tool gives you the AVIF half; your original WebP stays as the fallback.
Phone and computer
On a phone, you can pick WebP images saved from websites and convert them in seconds. On a computer, work through a whole folder at once and take the ZIP.
Good to know
The AVIF encoder is about 3.5 MB and loads on first use. Encoding is slower than saving a WebP, and that is the price of the smaller result. Pictures beyond about 50 megapixels may be heavy for older phones.
A worked example
A 1,200 pixel blog banner saved as WebP at 140 KB may come out near 100 KB as AVIF at a similar look. That is a small number for one picture. For a shop with 300 product photos, it is around 12 MB less to store and to send to visitors every time pages are loaded without a cache.
If the saving on a particular image is tiny or negative, leave that file as WebP. The row shows the size so you can decide picture by picture instead of converting everything blindly. AVIF can be smaller, but older software may not open it. Use PNG to WebP for wider support, JPG to AVIF for photos, and WebP to JPG when you need a very common format.
Features
- Still WebP to AVIF
- Transparency is kept
- Bulk conversion with a ZIP
- Quality slider
- Shows the size saving
- Private, in your browser
Frequently asked questions
Is AVIF really smaller than WebP?
Usually yes, by about 20 percent at a similar look, and more for smooth images. Very small icons can come out similar or even slightly larger, which the row shows.
Does an animated WebP work?
Only the first frame is converted, giving a still AVIF. This tool is for still images.
Is transparency kept?
Yes. The alpha channel of the WebP is carried into the AVIF.
Do all browsers support AVIF as well as WebP?
Current Chrome, Edge, Firefox and Safari 16 and newer do. WebP has slightly wider support on older devices, so keep it as a fallback if you must.
Is this lossy?
Yes. The AVIF is saved with lossy compression. A WebP that was already lossy loses a little more, so avoid converting back and forth.
Are my files uploaded?
No. Everything is processed on your device.