Convert HEIC to AVIF
Free, unlimited HEIC to AVIF conversion that runs entirely inside your browser. No upload, no sign-up, no watermark.
Convert your HEIC files to AVIF
or drop them here, or paste with Ctrl+V · files never leave your device
Settings
Nothing queued yet. Add as many files as you like — everything runs on your own device.
Nothing is uploaded
Conversion runs in your browser. Your files never touch a server, so there is no copy of them to leak.
No sign-up, no watermark
No account, no email, no daily limit, and nothing stamped across your image.
Batch and folders
Drop a hundred files at once and download the results as a single ZIP.
Works offline
Once this page has loaded you can disconnect entirely and it still works.
This converter turns HEIC images into AVIF files without uploading anything. The conversion runs inside this page using your own device's processor, so your photos never leave your computer — there is no server copy to worry about, no queue to wait in, and no limit on how many files you convert.
HEIC is the format an iPhone uses by default, storing photos at roughly half the size of an equivalent JPG. Native on Apple devices, awkward on Windows, and refused by most upload forms — the single most common reason people convert an image. AVIF, by contrast, all current browsers decode AVIF. Outside the browser, support is still thin — which is usually why you need it converted.
Converting to AVIF is a page-speed exercise: it typically cuts image weight by a third or more with no visible difference, which shows up directly in Core Web Vitals. Keep the original HEIC as your master copy and serve the AVIF version.
How to convert HEIC to AVIF
- Add your HEIC files. Drag them onto the box above, click to browse, or paste an image straight from your clipboard. You can add as many at once as you like.
- Adjust the settings if you need to. The defaults suit most images. Raise the quality slider if the image contains text or flat colour.
- Download the AVIF file. Each file gets its own download button as soon as it finishes, and you can pull the whole batch down as a single ZIP.
What changes when you convert HEIC to AVIF
Every format conversion involves trade-offs, and vague tools hide them. Here is exactly what happens to your image in this particular conversion.
- Transparency is preserved: both HEIC and AVIF carry a full alpha channel.
- Both formats are lossy, so the file is being re-compressed. We decode HEIC at full fidelity and re-encode once at your chosen quality, which keeps generational loss to a minimum, but converting back and forth repeatedly will visibly degrade an image.
- AVIF encoding is genuinely slow — it runs the AV1 compressor in your browser. A large photo can take several seconds. The payoff is a file substantially smaller than the equivalent JPG.
- HEIC files from an iPhone carry EXIF orientation. We apply the rotation while decoding, so your photo comes out the right way up rather than sideways — a bug in a surprising number of converters.
About HEIC / HEIF (High Efficiency Image Format)
HEIC is the format an iPhone uses by default, storing photos at roughly half the size of an equivalent JPG.
Where you probably got it: Photos taken on an iPhone or iPad with default camera settings.
Strengths
- About half the file size of JPG at the same visual quality
- Keeps depth maps, Live Photo data, HDR and wide colour
- Saves a great deal of space on your phone
Limitations
- Windows needs a paid codec from the Microsoft Store to even preview it
- Rejected by most websites, upload forms and older software
- Patent-encumbered, which is why support outside Apple is so poor
About AVIF (AV1 Image File Format)
AVIF is a modern format built on the AV1 video codec, producing the smallest files of any widely supported image format.
Support: All current browsers decode AVIF. Outside the browser, support is still thin — which is usually why you need it converted.
Strengths
- Typically 30–50% smaller than JPG at visually identical quality
- Handles transparency, HDR and wide colour gamut
- Royalty-free and supported in all current browsers
Limitations
- Encoding is computationally expensive — noticeably slower than JPG or PNG
- Very little support outside browsers: most desktop and print software cannot open it
- Can smear fine texture at aggressive settings
Is it safe to convert HEIC online?
Here, yes — and you can check rather than trust. Open your browser’s developer tools, switch to the Network tab and convert a HEIC file: no request carrying your image is made. Disconnect from the internet after this page has loaded and the converter still works, which would be impossible if a server were doing the conversion.
That is worth verifying wherever you convert, because most online converters do upload, and HEIC files are so often ID photos, medical scans and screenshots of bank apps — iPhone camera rolls are full of documents as well as pictures. Once a file is on somebody else’s server you are relying on a privacy policy rather than on anything you can observe. We wrote up how to tell a safe converter from a risky one in more detail.
Frequently asked questions
How do I convert HEIC to AVIF?
Drag your HEIC file onto the box above, or click it to browse. The conversion starts immediately in your browser and the AVIF download appears within a second or two for most images. You can drop in a whole folder of files at once and download them together as a ZIP.
Are my HEIC files uploaded to a server?
No. The conversion happens locally in your browser, so your files are never transmitted anywhere — the tool even works with the network disconnected once the page has loaded. That is also why there is no file size or file count limit: nothing costs us anything per conversion. The practical ceiling is your own device's memory, which on a phone means very large images may fail.
Will converting HEIC to AVIF reduce the quality?
A little. Both formats are lossy, so the image is decompressed and re-compressed once. We decode at full fidelity and encode a single time at your chosen quality, so a one-off conversion is close to invisible — but avoid converting the same image back and forth repeatedly.
How do I stop my iPhone making HEIC files in the first place?
Open Settings, then Camera, then Formats, and choose "Most Compatible" instead of "High Efficiency". New photos will be saved as JPG. Existing photos stay HEIC, which is what this converter is for. There is also a related setting under Settings > Photos > Transfer to Mac or PC — set it to "Automatic" and iOS converts on transfer.
What is the difference between HEIC and AVIF?
HEIC is the format an iPhone uses by default, storing photos at roughly half the size of an equivalent JPG. AVIF is a modern format built on the AV1 video codec, producing the smallest files of any widely supported image format. In practice the choice comes down to compatibility: native on Apple devices, awkward on Windows, and refused by most upload forms — the single most common reason people convert an image. Meanwhile all current browsers decode AVIF. Outside the browser, support is still thin — which is usually why you need it converted.