How to convert HEIC to AVIF
- 1 Drop your HEIC files onto the page, or click “Choose files”. You can add many at once, or a whole folder.
- 2 AVIF is already selected as the output. Optionally open Options to adjust quality, lossless, max width.
- 3 Click Convert, then Save. Converting several files? Save them all as one ZIP.
About the formats
HEIC · High Efficiency Image Format
HEIC (or HEIF) is the photo format iPhones and iPads use by default since iOS 11. It stores photos at about half the size of JPG, but many apps, websites and Windows PCs cannot open it.
AVIF · AV1 Image File Format
AVIF is a next-generation image format based on the AV1 video codec. It often produces files half the size of JPG with better detail, and supports HDR and transparency.
The conversion runs on your device using jSquash (MozJPEG, OxiPNG, libwebp, libavif and libjxl) compiled to WebAssembly. For the best result it goes through PNG on the way, which happens automatically. You can adjust: quality, lossless, max width, max height, rotate, flip.
Frequently asked questions
How do I convert HEIC to AVIF?
Drop your HEIC files onto the page, or click “Choose files”. You can add many at once, or a whole folder. AVIF is already selected as the output. Optionally open Options to adjust quality, lossless, max width. Click Convert, then Save. Converting several files? Save them all as one ZIP.
Are my files uploaded to a server?
No. The conversion runs entirely in your browser using WebAssembly. Your files never leave your device, so it is safe for private photos, contracts and business data. Once the page has loaded it even works offline.
Will converting HEIC to AVIF reduce quality?
AVIF uses lossy compression, so some detail is traded for a smaller file. At the default quality the difference is very hard to see or hear, and you can raise the quality setting if you need more.
Can I convert multiple HEIC files to AVIF at once?
Yes. Add as many HEIC files as you like; they are converted in parallel on your device and you can download them all as a single ZIP.
Is it free? Are there limits?
It is free, with no sign-up, no watermark and no daily limits. Because nothing is uploaded there is no upload size limit either; the only limit is your device’s memory, which matters mostly for very large videos.
Why can’t I open HEIC photos on Windows or upload them to websites?
HEIC needs a separate codec on Windows, and most websites only accept JPG or PNG. Converting to JPG makes your iPhone photos work everywhere.
How do I stop my iPhone saving photos as HEIC?
On your iPhone go to Settings → Camera → Formats and choose “Most Compatible”. New photos will then be saved as JPG.
Convert HEIC to other formats
Convert other formats to AVIF
See everything the HEIC converter and the AVIF converter can do.