Free · No signup · Runs in your browser · Batch · Quality control · Beta
HEIC to AVIF Converter
AVIF is the most space-efficient image format widely supported by browsers today, often producing files 30–50% smaller than WebP at the same visual quality. This converter re-encodes your HEIC photos to AVIF locally, using a WebAssembly encoder loaded only when you pick this format.
Your photos never leave your device. Open DevTools → Network and convert a photo — you’ll see zero uploads. Learn how to verify this.
When to use HEIC to AVIF
- You want the smallest possible file size for web publishing
- Your website or CMS already serves AVIF for other images
- You are comfortable with a beta-quality encoder in exchange for maximum compression
- Slightly longer encode times are acceptable for the size savings
How it works
- 1
Drop your HEIC photos
Drag and drop .heic files onto the converter, or click to browse.
- 2
AVIF encoder loads on demand
The WebAssembly AVIF encoder downloads only when you choose this format, then everything runs locally.
- 3
Download AVIFs
Download individually or as a ZIP once the batch finishes.
HEIC vs AVIF
| Aspect | HEIC | AVIF |
|---|---|---|
| Compression | HEVC | AV1 (typically the smallest of all formats here) |
| Browser support | Limited (mainly Apple) | Modern browsers (Chrome, Firefox, Edge, Safari 16+) |
| Encode speed | — | Slower than JPG/PNG/WebP |
| Status here | — | Beta encoder |
Frequently asked questions
Why is HEIC to AVIF marked as beta?
AVIF encoding in the browser uses a newer WebAssembly encoder than our JPG/PNG/WebP pipeline. It produces correct, high-quality output, but we are still tuning speed and edge cases, so we label it beta while that work continues.
Is AVIF smaller than WebP?
Generally yes — AVIF (AV1-based) tends to produce noticeably smaller files than WebP at comparable visual quality, at the cost of slower encoding.
Will AVIF open everywhere?
All modern browsers (Chrome, Firefox, Edge, and Safari 16+) display AVIF natively. Some older software and some photo apps do not yet support it — if in doubt, use JPG or WebP for maximum compatibility.
Does the AVIF encoder upload my photos?
No. It is a WebAssembly module that runs entirely in your browser tab; your photos never leave your device.
Why does AVIF take longer to convert than JPG?
AV1 encoding is more computationally intensive than JPEG or WebP encoding. For large batches, expect noticeably slower throughput than the other formats — the trade-off for the smaller output files.