HEIC is the default iPhone photo format (iOS 11 and above) using HEVC compression. Files are about half the size of JPG at the same quality, but often cannot be opened on Windows, Android, and older apps. However, HEIC isn't always ideal — especially when you need AVIF.
AVIF brings the advantage: Most efficient format — up to 50% smaller than JPG, ideal for max loading speed.
With FORMATTO, you can convert HEIC to AVIF in seconds. Everything runs 100% on your device — files are never uploaded to any server, so your privacy is guaranteed. Did you know? HEIC can save up to 50% storage compared to JPG — that's why iPhone uses it by default.
How to convert HEIC to AVIF
- 1Select or drag your HEIC files to the box above (batch supported).
- 2Adjust quality and size as needed, then click "Convert to AVIF".
- 3Download results one by one or together as a ZIP. Done — no signup, no upload.
Why your files are safe
100% on device
Files never leave your device.
No trace
Close the tab, data is gone.
Free
Unlimited, no watermark.
Frequently asked questions
How to convert HEIC to AVIF?
Just drag your HEIC files to the converter box above, pick your settings, then click convert. The AVIF result is ready to download — all processed on your device.
Is FORMATTO really free?
Yes, 100% free with unlimited conversions. Because everything runs in your browser, we have no per-conversion server cost — so it stays free forever.
Are my HEIC files safe?
Very safe. Your files are processed directly on your device and never uploaded to a server. When the page is closed, no trace remains.
How many files can I convert at once?
You can process many files at once (batch). Download them individually or as a single ZIP.
Why can't I open my HEIC photos?
HEIC is only supported within Apple's ecosystem. Windows, Android, and most web apps don't understand it. Converting HEIC to JPG/PNG solves this.
Are HEIC and HEIF the same?
HEIF is the container name, while HEIC is the extension Apple uses for photos. Our converter supports both.
Does AVIF support transparency?
Yes. Unlike some other formats, AVIF supports transparency (alpha channel) so empty areas stay see-through.