Convert HEIC photos from your iPhone to AVIF, the smallest modern format. Around 50% smaller than JPEG with transparency support.
Last updated: August 2026
AVIF
Smallest Format
~50%
Smaller than JPEG
Batch
Multiple Files
Private
No Uploads
AVIF encoding is slower than JPEG or WebP. Large files or large batches may take a little longer to finish, entirely in your browser.
Drop HEIC files here or click to browse
Supports .heic and .heif. All processing stays in your browser.
Four steps, all running locally in your browser.
Drop your HEIC files
One file or a whole batch. Nothing is uploaded, everything stays on your device.
Adjust quality, optional
60 to 95, defaulting to 75, lower than JPEG and WebP since AVIF needs less quality budget for the same result.
Each file decodes then encodes
AVIF encoding is noticeably slower than JPEG or WebP. Status shows decoding, then encoding, then done.
Download
One click for a single file, or all at once as one ZIP for a batch.
AVIF is the most efficient widely supported image format available today. It typically produces files around 50 percent smaller than an equivalent JPEG and noticeably smaller than WebP, while keeping visual quality close to the original. It also supports transparency. For web use, AVIF is the format that delivers the smallest possible page weight from a HEIC source.
Maximizing page speed
Replacing a large HEIC export with AVIF reduces page weight more than almost any other format choice.
Photographic detail
AVIF's compression advantage is most pronounced on detailed photographic content, exactly what HEIC photos contain.
Transparency support
Unlike JPEG, AVIF supports alpha transparency. Convert HEIC screenshots or product photos that need a transparent background.
Modern browser support
AVIF support is now near universal across Chrome, Safari, Firefox and Edge as of 2026.
If you need guaranteed compatibility with older software or upload portals, use the HEIC to JPG converter instead.
HEIC and AVIF both grew out of video codec technology rather than being built from scratch as photo formats. HEIC is based on HEVC, AVIF on AV1, and the two codecs share a lot of the same compression thinking. That means converting between them isn't the dramatic size overhaul you'd get going from an old format like BMP or GIF, since HEIC was already fairly efficient to begin with.
What HEIC actually struggles with is support, not compression. Most software outside Apple's own ecosystem, plenty of Android phones, and a long list of upload portals still can't open a HEIC file directly. Converting to AVIF trades a format built around one ecosystem for one with near universal browser support, so the real win here is compatibility. The file might shrink a little further, but don't expect the same dramatic drop you'd see converting a much older format.
AVIF as a format can store more bits per color channel than JPEG, which in principle allows it to hold onto extra highlight and shadow detail from a Smart HDR photo. This tool doesn't take advantage of that, though. HEIC files are decoded into standard 8-bit pixel data before AVIF encoding even starts, the same intermediate step used for the JPEG and WebP converters. If the original capture had extended dynamic range beyond 8-bit, it's already been reduced to a standard 8-bit reproduction by the time AVIF gets it, so the format's higher-bit-depth capability isn't something this particular pipeline puts to use. The real, reliable benefit of converting here is smaller file size and alpha transparency, not extra dynamic range.
A HEIC file from a Live Photo or portrait mode shot can bundle depth data or reference a short video clip alongside the still image. This tool, like sharing a Live Photo outside Apple's own apps, only carries over the primary still frame. If you need the moving portion of a Live Photo, export that separately from the Photos app before converting the still image here.
Expecting a Live Photo's motion or a portrait's depth data to carry over
This tool decodes and converts only the primary still frame. If the original HEIC came from a Live Photo or portrait mode shot, any motion clip or depth data attached to it does not transfer to the AVIF output.
Assuming AVIF preserves HDR range beyond what an 8-bit JPEG could show
The AVIF format itself supports higher bit depth, but this tool's pipeline decodes HEIC into standard 8-bit pixel data before encoding, the same as the JPEG and WebP converters. Any extended dynamic range from Smart HDR is already reduced to 8-bit by that point, so AVIF's real advantage here is file size and transparency, not extra HDR headroom.
Pushing quality to 95 and expecting the same speed as JPEG
AVIF defaults lower (75) than JPEG (85) or WebP (82) because it needs less quality budget for a comparable result. Raising it toward 95 works, but meaningfully increases encoding time on a format that's already the slowest of the three.
Expecting a large batch to finish as fast as a JPEG or WebP batch
AVIF encoding is markedly slower per file than JPEG or WebP. A batch of twenty or thirty HEIC photos will take a real stretch of time, all of it running locally in your browser tab.
Assuming a HEIC photo has transparency it never had
Most iPhone photos are fully opaque. AVIF preserves transparency if the source has it, but conversion doesn't add transparency that wasn't there to begin with.
AVIF is the most efficient widely supported format for photographic content, typically producing files around 50 percent smaller than an equivalent JPEG and noticeably smaller than WebP at the same visual quality. For HEIC photos headed to a website where maximum compression matters most, AVIF gives the smallest practical file size.
AVIF's compression is more efficient per quality point than JPEG or WebP, so a lower number produces comparable visual results. The default of 75 reflects that, it isn't a lower-quality setting in practice, just a different scale. Pushing the slider toward 95 works, but it noticeably increases encoding time for a format that's already the slowest of the three to encode.
Yes. AVIF support is now near universal across Chrome, Firefox, Safari and Edge, and Google's PageSpeed Insights recommends it as a preferred format for web images. For guaranteed compatibility with very old browsers, software or upload portals, JPEG or WebP remain safer fallback choices.
Yes, AVIF encoding is more computationally intensive and can take noticeably longer than JPEG or WebP, especially for large HEIC files or big batches. This happens entirely in your browser using WebAssembly, so there is no upload wait, only the local encoding time itself.
Yes. AVIF supports full alpha transparency. Most iPhone HEIC photos do not contain transparency, but if the original does, the AVIF output will preserve it.
Yes. Drop multiple HEIC files or select them from the file picker. Each converts independently. Download individually or as a ZIP file.
No. All conversion happens entirely in your browser. Your files never leave your device. GPS, EXIF and metadata are not present in the AVIF output.
No sign-up. No uploads. Drop your HEIC files above and download the AVIF versions in seconds.
