AVIF is a next-generation format with the highest compression efficiency available. Current browsers open AVIF, but support in programs and services is uneven.
WebP is a web format that is smaller than JPG and supports transparency and animation. When you convert AVIF to WebP, you can open it in more places and the file grows. See the comparison below for what changes.
This converter reads the file itself to confirm it is AVIF, then converts it to WebP right in your browser. Your image is never uploaded.
AVIF vs WebP: what's the difference?
| Item | AVIF | WebP |
|---|---|---|
| Compression | Lossy or lossless | Lossy or lossless |
| Transparent background | Yes | Yes |
| Animation | Yes | Yes |
| Introduced | 2019 | 2010 |
| Support in programs and upload forms | limited | moderate |
| Shown directly in browsers | Yes | Yes |
| Photo file size (JPG = 1) | about 0.5× | about 0.7× |
What is AVIF?
AVIF is an image format released in 2019 that builds on the still-image technology of the AV1 video codec. At the same quality it can be around 50% smaller than JPG, so websites sensitive to file size are adopting it quickly.
What is WebP?
WebP is a web image format Google released in 2010. At the same quality it can be roughly 25-35% smaller than JPG, and it handles lossy and lossless compression, transparency and animation in a single format.
What changes when you convert AVIF to WebP
An already-compressed image is compressed again
Both AVIF and WebP are lossy, so converting AVIF to WebP adds a little more degradation. Keeping quality at 90 or higher usually avoids visible differences, and it's best to convert from the original only once.
You can adjust quality, size and background color
When converting AVIF to WebP, you can use the quality slider (default 90), exact width-and-height sizing with margin fill, and percentage resizing. AVIF is already lossy, so pushing quality too low stacks up visible degradation. Even when size matters, try not to go below 80.
How the file size changes
For the same photo, WebP tends to be larger than AVIF (about 1.4×). This is for photos; for simple images such as logos and screenshots, PNG can actually come out smaller.
WebP opens in more places
Support for AVIF in programs, document tools and upload forms is limited, while WebP is moderate. If you need to upload somewhere AVIF wouldn't open, try again after converting.
When to convert
- You need to upload to a program, messenger or upload form that can't open AVIF
- You want to make AVIF images lighter so pages load faster
- You're preparing an image for typical WebP uses (optimizing website images, transparent web graphics)