WebP to AVIF Converter — Further Size Reduction with AV1 Codec
Convert WebP to AVIF online. AV1 codec delivers roughly 20% smaller files than WebP at matched quality, with transparency preserved and modern-browser support.
Drag & drop a file here, or click to select
Max file size: 100 MB
Why convert WEBP to AVIF?
WebP and AVIF are both modern web-delivery formats with transparency support, but AVIF's AV1 codec is measurably more efficient than WebP's VP8 — typically producing files around 20% smaller at matched perceptual quality. For performance-sensitive sites that have already adopted WebP, upgrading to AVIF is the next step in the image-compression ladder. The main trade-offs are encode time (AVIF is noticeably slower to encode) and browser-support breadth (AVIF lags WebP slightly in older Samsung Internet and a few specialty browsers). If you're building a <picture> element with multiple sources, AVIF goes first, WebP second, JPG third. Converting WebP to AVIF directly preserves what the WebP decoded to, including transparency.
AV1 codec efficiency
AVIF's AV1-based compression beats WebP's VP8 on virtually every real-world image. Expect around 20% size reduction at matched perceptual quality.
Transparency preserved
AVIF supports a full alpha channel, so transparent WebP regions translate 1:1 without flattening. Cut-outs, overlays, and soft anti-aliased edges survive cleanly.
Future-proof format
AVIF is where the still-image format roadmap is heading. Building your asset pipeline around AVIF now positions you for broader adoption in the coming years.
When WebP to AVIF is worth the encode cost
Upgrade to AVIF when page-speed is the bottleneck and your audience is on modern browsers.
Hero images and LCP-critical content where 20% size reduction matters.
Performance-sensitive sites with modern-browser-majority audiences.
Build-time asset pipelines where slower encode is invisible to end users.
Skip the upgrade if Samsung Internet or older-Safari traffic is a meaningful share of your audience.
Our secure conversion process
We show you exactly what happens when you convert, so you know where data goes and what stays untouched.
Upload a WebP
Drop your WebP above. AVIF encoding takes a few seconds longer than WebP — that's AV1 at work.
Choose AVIF
AVIF is preselected; click Convert. Sharp uses balanced defaults tuned for web use.
Download your AVIF
Download in-browser. Pair with a WebP fallback in a <picture> element for broader coverage.
Want to try it out? Upload your file above, no signup required.
What you get
Every conversion here runs on a temporary copy, delivers a ready download, and clears out quickly after you’re done.
- Roughly 20% smaller than the WebP source at matched perceptual quality.
- Transparency preserved end-to-end with full alpha channel support.
- AV1 codec handles gradients and large flat areas better than VP8.
- Conversion runs on a temporary copy that we delete right after processing.
Frequently asked questions
Is the 20% size reduction real-world or best-case?
It's the typical mid-case for photographic content. Some images compress even more aggressively in AVIF (low-detail landscapes can hit 30%+ reduction), while highly noisy or already-tightly-compressed WebP inputs see smaller wins. Tight WebP sources in lossless mode may not compress further in AVIF at all.
Why is AVIF encode slower than WebP?
AV1 does more analysis per pixel than VP8 — that's literally the mechanism behind better compression. For a typical web image, AVIF encoding takes a few seconds; WebP takes fractions of a second. For batch pipelines or build-time conversion, the difference doesn't matter to end users.
Do I need to serve both WebP and AVIF?
Depends on your audience. AVIF is supported in ~95% of global browser traffic as of 2025 — Chromium 85+, Firefox 93+, Safari 16.1+. If your audience has significant Samsung Internet, UC Browser, or older Safari share, serve both via <picture> with AVIF first, WebP second. For modern-only audiences, AVIF alone with a JPG fallback is sufficient.
Does transparency transfer correctly?
Yes. Both formats support full 8-bit alpha channels with identical semantics. Transparent regions, partial-transparency edges, and anti-aliased pixels all carry over 1:1.
What about animated WebP?
We take the first frame and encode it as a still AVIF. AVIF does support animation (AVIS), but Sharp's encoder produces still images only. For animated WebP to animated AVIF, you'd need a dedicated encoder with AVIS support.
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