Convert HEIF to AVIF
Convert HEIF images to AVIF when your target platform supports AVIF and maximum size reduction is a priority.
100% Private — No Upload
85%
Drag & drop your images here
or click to browse, or paste (Ctrl+V)
Supports HEIC, HEIF, WebP, PNG, JPG, AVIF, BMP
Known limitations
Before converting, note these constraints:
- Output behavior follows format capabilities (for example transparency support and lossy/lossless rules).
- Final file size depends on source image content and selected quality settings.
- If compatibility is critical, choose broadly supported targets first (typically JPG).
How to Convert HEIF to AVIF
1
Drag and drop your HEIF files into the box above, or click to browse.
2
Files are converted to AVIF instantly in your browser.
3
Download each file or use Download All for batch output.
Frequently Asked Questions
Why convert HEIF to AVIF?
AVIF uses AV1-based compression and provides stronger size reduction in modern benchmark comparisons.
When should I choose WebP or JPG instead?
Choose WebP or JPG when compatibility requirements include older browsers, legacy apps, or upload endpoints without AVIF support.
Why is the output file sometimes larger than the original?
The output file becomes larger for three clear reasons: (1) Converting from a lossy format (JPG, WebP) to a lossless format (PNG) preserves every pixel, so file size increases in exchange for zero quality loss. (2) AVIF uses the AV1 codec, which has encoding overhead for small or simple images. AVIF delivers its strongest compression gains on high-resolution photos, with 20–50% better compression than JPEG in benchmark comparisons. (3) If the source is already heavily compressed, re-encoding does not reduce size further. PicShift uses industry-leading WASM encoders (MozJPEG, OxiPNG, libwebp) to produce the smallest possible output at your chosen quality. In compress mode, PicShift automatically keeps the original file when compression increases size. Learn more: https://picshift.app/docs/size-increase-explainer