Should I replace all my JPGs with AVIF?

AVIF can cut file sizes meaningfully, but it encodes slowly and benefits from a fallback for older clients. Many sites serve AVIF or WebP with a JPG fallback rather than replacing files outright.

Does WebP support transparency and animation?

Yes. WebP supports an alpha channel and animation, so it can replace both transparent PNGs and simple animated GIFs.

Do these tools upload my images?

No. Utilumo's image tools decode, edit, and export pictures inside the browser tab. The files are never uploaded or stored on a server.

Comparison1 min readUpdated June 25, 2026

WebP vs AVIF: which modern image format wins?

Short answer

AVIF generally produces smaller files at the same quality and supports HDR and wide color, but encodes more slowly. WebP is faster, lighter to produce, and very widely supported. Both are excellent upgrades over JPG and PNG for the web.

Where they come from

WebP was created by Google and is built on the VP8/VP9 video codecs. AVIF is newer and is based on the AV1 video codec from the Alliance for Open Media. Both support lossy and lossless modes, transparency, and animation.

Compression and quality

AVIF typically reaches smaller files than WebP at the same perceived quality, and it holds up especially well at low bitrates where WebP can look blocky. AVIF also supports higher bit depth, HDR, and wide color gamut, which matters for high-end photography.

Encoding speed and support

WebP encodes quickly and is supported in every current major browser.
AVIF encodes more slowly, especially at high effort settings, but is now supported across current Chrome, Firefox, and Safari.
For broad compatibility with older clients, keep a JPG or PNG fallback.

A practical rule: reach for WebP when you want a fast, safe upgrade from JPG/PNG, and reach for AVIF when squeezing the last bytes out of large hero images is worth slower encoding.

Try it: Image ConverterConvert images to WebP locally. AVIF can be used as input when your browser can decode it.Open tool