WEBP to AVIF Converter

1. Upload one or more WebP files (up to 50 MB total).
2. Click 'Convert to AVIF' — finishes in under 4 seconds per image.
3. Download AVIF files individually, or grab all as a ZIP.

AVIF is 30-50% smaller than WebP at the same visual quality — the trade-off is that AVIF encoding is slower and the format is newer. Both are modern web formats, but AVIF is the most efficient option available.

WebP is the workhorse of modern web images — 25-35% smaller than JPG and supported by all browsers since 2020. But AVIF is even more efficient: 30-50% smaller than WebP at the same visual quality. Both are royalty-free and modern. If your target browsers support AVIF (universal since 2024), converting WebP to AVIF gives you the smallest possible file size for maximum performance.

The converter decodes the WebP image and re-encodes it as AVIF using libavif at 85% quality. AV1-based compression is more efficient than WebP's VP8, producing files 30-50% smaller. WebP's 8-bit alpha channel is preserved as AVIF's alpha channel, so transparency survives the conversion.

• Future-proofing a WebP image library to the newest format.
• Achieving maximum compression for bandwidth-sensitive websites.
• Preparing images for modern web frameworks that support AVIF.
• Optimizing hero images and above-the-fold content.
• Reducing CDN delivery costs further than WebP allows.
• Converting a WebP archive to the most efficient format.
• Preparing images for HDR displays (AVIF supports 10-bit HDR).

AVIF output uses 85% quality — visually indistinguishable from the source WebP at normal viewing distances. AVIF's compression is 30-50% more efficient than WebP, so the output is significantly smaller at the same perceived quality. Transparency is preserved. AVIF is the best format for maximum compression in modern web delivery.

• Very old browsers (pre-2020) cannot display AVIF.
• AVIF encoding is slower than WebP (2-4 sec vs 1-2 sec).
• Some legacy CMS platforms may reject AVIF without plugins.
• Very old software (pre-2020) may not support AVIF.
• AVIF is not supported by Photoshop versions before 23.2.

• AVIF opens natively in every browser released since 2020.
• Native support in Windows 11, macOS Big Sur+, iOS 16+, Android 12+.
• Supported by modern CMS (WordPress via plugin, Ghost, Next.js).
• Native import in Photoshop 23.2+, GIMP 2.10.22+, Affinity Photo 2+.
• Supported by modern CDNs (Cloudflare, CloudFront, Akamai).

• AVIF is supported by every browser since 2024 — safe for modern sites.
• For older browser support, serve AVIF with WebP or JPG fallback.
• AVIF encoding is slower — expect 2-4 seconds per image.
• AVIF is the best format for HDR displays.
• Batch-convert up to 50 MB of WebP files at once.

AVIF conversion is slow

AV1 encoding is CPU-intensive. Typical conversion is 2-4 seconds per image. The 30-50% file size reduction is the trade-off.

AVIF file is smaller than expected

If the source WebP was already heavily compressed, AVIF cannot compress much further. The 30-50% saving is typical for high-quality sources.

Some software won't open AVIF

Software released before 2020 may not support AVIF. For legacy compatibility, use WebP or JPG instead.

• Alliance for Open Media — AVIF
• Google Developers — WebP
• Can I Use — AVIF