WebP to AVIF
WEBConvert WebP images to AVIF online — free, fast and private. Your files never leave your browser. Nothing is uploaded.
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What is the WebP to AVIF tool?
WebP to AVIF converts your WebP images into AVIF, the most compact image format modern browsers can display — free, entirely in your browser, with nothing uploaded. If you've already moved a site's images to WebP, AVIF is the next step down in file size: at the same visual quality it generally compresses tighter, which matters at scale for image-heavy pages, bandwidth budgets and Core Web Vitals scores.
WebP versus AVIF in two lines: WebP is older, encodes faster and enjoys near-universal support; AVIF squeezes files harder and handles gradients and photographic detail especially well at low sizes. If your visitors are on current browsers — Chrome, Edge, Firefox, Safari 16+ — serving AVIF is a straightforward saving; keep a WebP or JPG fallback for the rest.
The conversion runs on your device: your browser decodes the WebP and encodes the AVIF locally with a quality slider under your control, so nothing is uploaded and there are no accounts, API keys or daily quotas. Transparency carries over — both formats support alpha. Two honest caveats: an animated WebP converts as a still image (its first frame), and in-browser AVIF encoding is most reliable in Chromium browsers like Chrome and Edge. The reverse direction lives in the AVIF to WebP converter.
How to use the WebP to AVIF
- Open the WebP to AVIF converter — From is preset to WebP and the target to AVIF.
- Click «Choose images» or drop your .webp files into the drop zone; several at once is fine.
- Set the quality slider — a high setting keeps the image visually identical while shrinking it further.
- Press «Convert» — decoding and AVIF encoding run locally in your browser.
- The AVIF downloads automatically; a batch of files arrives together as one zip.
Frequently asked questions
Is AVIF smaller than WebP?
Usually, yes. At the same visual quality AVIF generally produces tighter files than WebP, especially for photographic images and gradients. The exact saving depends on the image — convert and compare the real output sizes.
Why convert WebP to AVIF at all?
To cut file size further on pages you're optimising. If your images are already WebP, re-encoding the heaviest ones to AVIF trims additional kilobytes at no visible quality cost — worthwhile on image-heavy or high-traffic pages.
Does transparency survive the conversion?
Yes. Both WebP and AVIF support alpha transparency, so transparent backgrounds and soft edges are preserved.
What happens to an animated WebP?
It converts as a still image — the first frame becomes the AVIF. This tool doesn't produce animated AVIF output, so keep the original if you need the motion.
Are my images uploaded to a server?
No. The whole conversion happens inside your browser on your own device — no upload, no account, and your files are never stored anywhere.
Is this free? Any limits or API keys?
Completely free — no sign-up, no API key, no watermark, no daily quota. Only your device's memory limits very large batches. If AVIF encoding fails in your browser, try a Chromium browser such as Chrome or Edge.