Convert GIF to AVIF — Modern Format, True Color, Smaller Files

How much smaller is AVIF than GIF?

Often dramatically smaller, but the comparison depends on what's in the image. GIF is limited to a 256-colour palette, so its file size is already constrained — but it stores that limited palette with fairly basic LZW compression. AVIF can use a full 24-bit colour range and modern AV1-based compression, so a converted still frame is usually much smaller than the source GIF while looking sharper, since it's no longer restricted to 256 colours.

• Static GIF → AVIF: typically 50-80% smaller, with better colour depth than the original palette
• Photographic content benefits most — GIF's palette limit hurts photos more than flat graphics
• Simple icons/logos with few colours see smaller size differences since GIF already compresses them well
• Most browser-based converters output a single still frame from the GIF, not an animated AVIF

Is AVIF supported everywhere I'd want to use it?

AVIF works in all current versions of Chrome, Edge, and Firefox, and in Safari 16+ (released 2022). That covers the large majority of web traffic in 2026. The gaps are mostly in older devices, some email clients, and certain image-editing or design tools that haven't added AVIF support yet.

• Chrome, Edge, Firefox, Safari 16+: full AVIF support
• Older Safari/iOS versions and some email clients: limited or no AVIF support
• If you need a fallback, use <picture> with an AVIF <source> and a JPG/PNG/WebP <img> as the default
• Check your specific image tools (design software, CMS plugins) before relying on AVIF exclusively

Should I replace GIFs on my website with AVIF?

For static images — photos, screenshots, graphics shown with an <img> tag — yes, AVIF is usually a clear improvement in both quality and file size. For animated GIFs used as lightweight looping clips, check that your converted AVIF actually plays as an animation in the browsers you care about before replacing the GIF outright, since animated AVIF support is less consistent than static AVIF support.

• Static images: converting to AVIF improves load times and Core Web Vitals with no real downside
• Animated GIFs: verify playback in your target browsers, or keep the GIF/use animated WebP as an alternative
• Use <picture> with a fallback if any part of your audience uses older browsers
• Re-export from the original source when possible — converting an already-compressed GIF still inherits its palette limitations for that frame

Does converting to AVIF keep transparency from my GIF?

GIF transparency is "hard" — each pixel is either fully visible or fully transparent, with no in-between. AVIF supports a full alpha channel, including semi-transparent pixels, so the converted file can preserve whatever transparency the GIF had. It just won't gain soft edges that weren't in the original — a hard-edged GIF cutout becomes a hard-edged AVIF cutout, not a smoothed one.

• Transparent areas in the GIF remain transparent in the AVIF
• AVIF can store semi-transparent pixels, but the GIF source never had any to begin with
• Logos and icons with transparent backgrounds convert cleanly
• If you need soft/anti-aliased edges, that requires re-exporting from the original artwork, not just converting the GIF