Overview
Introduction
HEIF/HEIC is the photo format Apple devices use by default, and this tool attempts to convert one into a plain GIF, entirely inside your browser.
Because HEIF decode support is so browser-dependent, this tool is upfront about that: it tries the real, native browser decode path and reports an honest error if it fails, rather than guessing at pixel data.
What Is HEIF to GIF Converter?
A converter that attempts to decode an uploaded HEIF/HEIC image using the browser's built-in image decoding pipeline (createImageBitmap), then re-encodes any successfully decoded pixels as a GIF.
It has no HEIF decoder of its own; it entirely depends on native OS/browser codec support, which is inconsistent.
How HEIF to GIF Converter Works
The uploaded file is passed to the browser's createImageBitmap() API. On a browser/OS combination with HEIF decode support, this succeeds and yields real pixel data; on most others, it throws, which this tool catches and reports as a clear, specific error.
Decoded pixels are drawn to an off-screen canvas to extract raw RGBA data, then handed to this category's shared encodeGif() function to produce a single-frame GIF89a file, quantizing colors down to a fixed 216-color palette.
When To Use HEIF to GIF Converter
Use it on a Safari/Apple-platform browser where HEIC decoding is likely to work, when you need a widely-compatible GIF from an iPhone photo.
Don't rely on it in Chromium or Firefox: expect it to fail there with a clear explanation, not a workaround.
Often used alongside GIF to HEIF Converter, AVIF to GIF Converter and GIF to AVIF Converter.
Features
Advantages
- Uses the browser's real, native HEIF decoder where one exists, rather than attempting a hand-rolled (and likely broken) HEVC decode.
- Fails honestly and specifically when the browser can't decode HEIF, instead of returning corrupted or blank pixel data.
- Runs entirely client-side, so a personal photo never leaves your device even when the conversion does work.
Limitations
- HEIF/HEIC decoding is not available in most non-Apple browsers; expect failures on Chromium and Firefox regardless of OS.
- Only a single still image is produced, since createImageBitmap only exposes one decoded frame.
- GIF's fixed 216-color palette means photographic gradients from the source HEIF/HEIC can visibly band after conversion.
Examples
Best Practices & Notes
Best Practices
- Try Safari on an Apple device first if you need this conversion to actually succeed.
- Don't build an automated pipeline around this tool unless you control the exact browser it runs in: HEIF decode support is too inconsistent.
- If decoding fails, convert the HEIC to JPEG or PNG on your device (most phones offer this natively) before uploading here.
Developer Notes
convertHeifPixelsToGif is a thin wrapper around the shared encodeGif() function, mirroring png/lib/heif-to-png-converter.ts's approach: the component attempts the actual browser decode via createImageBitmap and only calls this lib function with a real PixelBuffer on success. The lib function itself just validates and forwards to encodeGif([{ image, delayCs: 10 }], 1).
HEIF to GIF Converter Use Cases
- Converting an iPhone HEIC photo to a widely-supported GIF for sharing on platforms that don't accept HEIC
- Testing whether a given browser/OS combination can decode HEIF at all
- Quickly previewing a HEIC file's contents in a browser tab, when it can be decoded
Common Mistakes
- Assuming a failed conversion means the HEIC file is corrupted: it's almost always just a missing browser decoder.
- Expecting output color fidelity to match the original photo; GIF's 216-color palette is a hard ceiling.
Tips
- If this tool fails, your OS's Photos app or Files app almost certainly has a built-in 'export as JPEG/PNG' option that sidesteps the browser decode issue entirely.
- Pair with heif-to-png-converter for a higher-fidelity (non-palette-limited) conversion when GIF's small color palette isn't a requirement.