WEBP to AVIF Converter
Convert WebP files (released 2010 (Google), Lossless + Lossy (your pick)) to AVIF (Lossless + Lossy (AV1-based), typically 30–50% smaller than WebP at the same quality). Runs in your browser — no upload, no signup.
Based on 12,431+ conversions delivered
Need to turn WEBP files into AVIF? This tool does it in seconds, right in your browser. WebP is known for Web production where every kilobyte counts and AVIF for Bandwidth-critical pages with modern audiences, so the conversion makes sense whenever your workflow has standardised on AVIF or your target platform expects it. In our sample set, WEBP files came out about 34% smaller as AVIF. There's no software to install and nothing is sent to a server — the fast path encodes locally and hands you the file immediately. Read on for a plain-language comparison of WebP and AVIF, the settings that matter, the pitfalls to avoid, and answers to the questions people ask most about WEBP → AVIF.
Looking to programmatically convert WEBP to AVIF?
Same engine, available as a JSON API. Drop a file or URL via REST and get the converted output back — no browser, no UI, no rate limits on paid tiers.
Sub-second response on common pairs
Webhook delivery for batch jobs
100+ format pairs supported
WEBP vs AVIF — side-by-side
The numbers and capabilities at a glance, so you know what you're trading.
WebP
- Year released
- 2010 (Google)
- Compression
- Lossless + Lossy (your pick)
- Transparency
- Yes (alpha in both modes)
- Animation
- Yes
- Browser support
- All modern browsers (95%+ since 2020)
- Best for
- Web production where every kilobyte counts
AVIF
- Year released
- 2019 (AOMedia)
- Compression
- Lossless + Lossy (AV1-based)
- Transparency
- Yes
- Animation
- Yes
- Browser support
- Modern browsers (~90% since 2023)
- Best for
- Bandwidth-critical pages with modern audiences
Real WEBP → AVIF file sizes
We ran a fixed set of sample images through this exact converter so you can see the typical size impact before converting your own files.
| Sample image | WEBP size | AVIF size | Change |
|---|---|---|---|
| Photo | 23.1 KB | 15.1 KB | -35% smaller |
| Screenshot / UI | 728 B | 642 B | -12% smaller |
| Logo / transparency | 2.8 KB | 1.9 KB | -33% smaller |
Measured on a 256×256 sample set with this converter on 2026-05-28. Real-world files vary with resolution, colour and content.
Heads up before converting WEBP → AVIF
What changes — and what your conversion will cost — based on how WebP and AVIF differ.
Older clients may not render AVIF
AVIF support: Modern browsers (~90% since 2023). Modern browsers and OS image viewers handle it natively, but legacy email clients, older CMS thumbnailers, and some print/design tools still don't. Confirm the downstream consumers in your pipeline accept AVIF before swapping at scale, or ship a WebP fallback for the long tail.
Best practices for WEBP → AVIF
Concrete settings to pick before you convert WebP to AVIF.
- Always preview the AVIF output before bulk-downloading — colour shifts, transparency surprises, and quality artifacts show up in the preview before they ship.
- Strip EXIF metadata if file size or privacy matters — camera GPS coordinates, timestamps, and serial numbers travel inside the image bytes by default.
- For photographic content, target a AVIF quality between 80 and 85 — that's the sweet spot where most encoders stop showing visible artifacts and the file size curve flattens.
- Verify the alpha channel rendered as expected — premultiplied vs straight alpha and edge halos around antialiased pixels are the most common surprises when going to AVIF.
- When converting to AVIF (animated), confirm the frame timing matches your source — some encoders default to a fixed 100ms delay per frame instead of preserving the original timing.
- For web AVIF delivery, encode in sRGB — wider colour spaces (Display P3, ProPhoto) render unpredictably across browsers and email clients.
When NOT to convert WEBP → AVIF
Honest cases where this conversion is the wrong call — pick a different format or keep your WebP source.
Skip if your audience uses legacy browsers
AVIF doesn't render on every old browser, email client, or built-in OS viewer. If your traffic includes IE11, legacy Outlook, or older Android WebViews, stay on WebP (or a universal format like JPEG/PNG) — or ship AVIF alongside a fallback via the HTML <picture> element.
Skip if the file is bound for print
AVIF is a delivery-grade web format. Print pipelines (offset, large-format, packaging) expect TIFF, PDF, or high-bit-depth PNG with embedded ICC profiles and a CMYK option. Converting WebP to AVIF for a print job will likely fail prepress checks — keep the original or convert to a print-friendly format instead.
The importance of a good image conversion
Why getting WEBP → AVIF right matters more than you think.
Frequently asked
The basics everyone asks before dropping a file.
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