AVIF (AV1 Image File Format) is the successor to WebP: files are typically 10–20% smaller than WebP at the same perceptual quality, and 40–60% smaller than JPEG. AVIF is supported natively by Chrome, Firefox, Safari 16.1+, and Edge — over 92% of global browser traffic in 2026. This converter accepts any common input format and produces best-in-class AVIF using a WASM build of libavif tuned with SSIM optimization, chroma-delta-Q, and progressive quality search. Everything runs in your browser using WebAssembly — nothing uploads.
Why AVIF beats WebP and JPEG
AVIF uses the AV1 video codec's intra-frame compression, which is fundamentally more efficient than the VP8-based compression WebP uses. Google, Netflix, and Cloudflare have all published benchmarks showing AVIF at parity with WebP produces 10–20% smaller files at the same perceptual quality (SSIM), and up to 50% smaller than JPEG. That extra compression matters for hero images, e-commerce galleries, and any site where mobile bandwidth is a constraint. The trade-off used to be encoder speed — early AVIF encoders were 100× slower than WebP — but the WASM libavif this tool uses runs in a few hundred milliseconds per image on modern hardware.
Browser support in 2026
AVIF is supported in Chrome, Edge, Opera, Firefox, and Safari 16.1+ — over 92% of global browser traffic. The remaining 8% (older Safari, some embedded WebViews, mid-range Android from 2019 or earlier) can be handled with a <picture> fallback: <picture><source type="image/avif" srcset="hero.avif"><source type="image/webp" srcset="hero.webp"><img src="hero.jpg" alt="…"></picture>. Every result on this tool comes with a one-click "Copy HTML" button that generates exactly that markup so you can paste it into your template without hand-writing it.
Best-in-class encoder tuning
The default WASM AVIF encoders online produce mediocre results because they leave every knob at the boring default. This tool ships production-grade tuning: tune=SSIM (perceptual quality target, not raw PSNR), chromaDeltaQ=true (better chroma quantization at low bitrates — critical for skin tones and gradient sky), speed=4 at the "best" preset (slower but 5–10% smaller output than default speed 6), and mild sharpening (3) to preserve detail without ringing. The result: AVIFs from this tool are noticeably smaller than what Squoosh or Cloudinary Free will produce at the same quality setting.
Alpha, HDR, and wide gamut
AVIF supports 10-bit and 12-bit color depth (HDR), the BT.2020 wide gamut, and lossless alpha channels. This converter preserves the color profile when present and encodes alpha at maximum quality (qualityAlpha) so transparent PNGs and iPhone HEIC photos round-trip without visible seams. For HDR content, keep the "Best" preset and disable resize — the wide-gamut data is preserved through the encoder. If you're preparing hero art for a wide-gamut display, this is the format to choose.