AVIF to WEBP Converter

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

AVIF is 30-50% smaller than WebP at the same quality — but WebP has been supported by browsers since 2011, while AVIF only became universal in 2024. Converting AVIF to WebP trades some efficiency for wider compatibility.

AVIF is the newest and most efficient image format, but adoption is recent — universal browser support arrived in 2024. WebP has been supported by Chrome since 2010, Firefox since 2019, and Safari since 2020. If you want broader compatibility with slightly older browsers, CMS platforms, or devices, WebP is the safer choice. You lose ~30-50% of the file size efficiency but gain a decade of additional compatibility.

The converter decodes the AV1-compressed AVIF image and re-encodes it as WebP using libwebp at 85% quality. WebP's VP8-based compression is slightly less efficient than AV1, so output is 30-50% larger than the source. Transparency from AVIF's alpha channel is preserved as WebP's 8-bit alpha.

• Serving images to slightly older browsers that don't support AVIF.
• Preparing images for CMS platforms that support WebP but not AVIF.
• Uploading AVIF images to forms that accept WebP but not AVIF.
• Reducing AVIF file size while maintaining broad compatibility.
• Serving images via CDNs that don't optimize AVIF yet.
• Preparing images for e-commerce platforms with WebP-only pipelines.
• Trading some compression for wider browser and platform support.

WebP output uses 85% quality — visually indistinguishable from the source AVIF at normal viewing distances. WebP is 30-50% less efficient than AVIF, so the output is larger, but still 25-35% smaller than JPG. Transparency is preserved. WebP is the best format when you need both compression and broad browser compatibility.

• WebP output is 30-50% larger than the source AVIF.
• WebP is still less efficient than AVIF for maximum compression.
• Some very old software (pre-2015) may not support WebP.
• Animated AVIF sequences are converted using only the first frame.
• HDR metadata from AVIF is not preserved (WebP is 8-bit).

• WebP opens natively in every browser released since 2020.
• Supported by WordPress 5.8+, Shopify, Squarespace, Wix, Ghost.
• Native import in Photoshop 23+, GIMP 2.10+, Affinity, Figma.
• Works with modern CDNs (Cloudflare, CloudFront).
• Ideal for web delivery where AVIF support is uncertain.

• WebP is supported by every browser since 2020 — safe for most web projects.
• For maximum compression on modern browsers, keep AVIF.
• Serve WebP with JPG fallback for the oldest browsers.
• WebP is the best format when CMS or CDN support is the constraint.
• Batch-convert up to 50 MB at once.

WebP file is 30-50% larger than AVIF

Expected. AVIF uses more efficient AV1 compression. WebP's advantage is broader compatibility (universal since 2020).

WebP won't open in very old software

Software released before 2015 may not support WebP. Convert to JPG or PNG for maximum compatibility.

WebP transparency looks jagged

WebP supports 8-bit alpha, so gradients should be smooth. Jagged edges usually indicate the source AVIF had a hard-edged alpha, not a smoothing issue.

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