Convert HEIC to AVIF
Drop a HEIC file below and get a AVIF back. The conversion happens on your own machine, so nothing is uploaded and there is no size or quantity limit beyond what your browser can hold in memory.
Drop images here
Accepts HEIC
Lower means a smaller file. 75 is a good default for photos.
100% in your browser Files are never uploaded.
Why convert HEIC to AVIF?
Plenty of websites, content management systems and older desktop programs reject HEIC uploads outright. AVIF is accepted just about everywhere, and that alone accounts for most of these conversions.
Both formats are lossy. Every re-encode discards a little more detail, so it is worth starting from the original rather than from a copy that has already been through this a few times.
HEIC vs AVIF at a glance
| Property | HEIC | AVIF |
|---|---|---|
| Compression | Lossy | Lossy |
| Transparency | Yes | Yes |
| Typical file size | 50-60% of an equivalent JPEG | 40-55% of an equivalent JPEG |
| Compatibility | Native on Apple devices; often rejected by web uploads | All current browsers; some older desktop apps lag behind |
| Usually comes from | iPhone and iPad photo libraries | Websites optimising page weight |
Frequently asked questions
Are my HEIC files uploaded anywhere?
No. The decoder and encoder are WebAssembly modules that run inside this page. You can verify it by opening your browser’s network tab — converting a file produces no outbound requests. You could even disconnect from the internet after the page loads and it would still work.
Is there a file size or quantity limit?
There is no limit imposed by us. The practical ceiling is your device’s memory, since the image has to be held uncompressed while converting. On a typical laptop, images up to around 100 megapixels convert without trouble.
Will converting to AVIF lose quality?
AVIF is a lossy format, so some data is discarded. At the default quality setting the difference is not visible at normal viewing sizes. If you need an exact copy of the pixels, choose PNG instead.
Does it work on a phone?
Yes. The same WebAssembly modules run on mobile browsers. Conversion is slower than on a desktop because phone CPUs are weaker, and very large images are more likely to hit memory limits.
Why does my iPhone save photos as HEIC?
Apple switched to HEIC in iOS 11 because it fits roughly the same picture into about half the space of a JPEG. The trade-off is patchy support outside Apple’s own ecosystem, which is exactly why so many uploads get rejected. You can tell the camera to shoot JPEG instead under Settings → Camera → Formats → Most Compatible, at the cost of the space saving.
Where does AVIF actually work?
Every major browser decodes AVIF natively, so it is safe for use on the web. Desktop applications lag further behind — plenty of image viewers and editors still cannot open it. Encoding is also noticeably slower than the other formats here, so expect a large image to take a few seconds.