Convert HEIC to AVIF Online
Turn HEIC files into AVIF directly in your browser using ConverterUp. There is no upload, no waiting in a queue, and no account required — your files stay on your device while WebAssembly does the work locally. Adjust quality and dimensions where supported, then download the result. The output keeps the visual fidelity you'd expect from a desktop app while running entirely in the browser tab.
Convert HEIC to AVIF nowHow to convert HEIC to AVIF
Open the converter
Click the button to open the HEIC to AVIF tool. It loads instantly — no install, no signup.
Drop your HEIC file
Drag your HEIC file into the upload area or click to browse. The file stays in your browser memory only.
Download AVIF
The conversion runs locally and finishes in seconds. Click download to save the AVIF file to your device.
HEIC vs AVIF at a glance
Key technical differences between the two formats, so you know what to expect before converting.
| Feature | HEIC | AVIF |
|---|---|---|
| Type | Raster image | Raster image |
| Compression | Lossy | Lossy or lossless |
| Transparency | Full alpha channel | Full alpha channel |
| Animation | — | Yes |
| Bit depth | 8, 10 bit/channel | 8, 10, 12 bit/channel |
| Common codecs | HEVC (H.265) | — |
| Browser support | Partial | All modern browsers |
| Extensions | .heic | .avif |
| MIME type | image/heic | image/avif |
| Introduced | MPEG (ISO/IEC 23008-12) | 2019 · Alliance for Open Media |
What changes when you convert HEIC to AVIF
- AVIF stores pixels losslessly, so no additional detail is lost — but it cannot restore detail that HEIC compression already discarded, and the file usually gets bigger.
- Transparency is preserved: AVIF supports an alpha channel, so transparent backgrounds from HEIC stay transparent.
- Compatibility improves: AVIF opens in more browsers, apps and operating systems than HEIC.
- HEIC is the default photo format on iPhones and iPads. Converting it avoids the "unsupported file" errors common on Windows, Android and many websites.
About HEIC
HEIC is Apple's name for HEIF images compressed with HEVC (H.265). It is the default photo format on iPhone and iPad, storing photos at roughly half the size of an equivalent JPG.
- Best for
- Photos taken on Apple devices and stored in iCloud Photos.
- Strengths
- Small files with high quality, 10-bit color, depth and Live Photo data.
- Limitations
- Poor support outside Apple devices: many Windows apps, Android devices and websites cannot open it.
About AVIF
AVIF is an image format based on the AV1 video codec, published by the Alliance for Open Media. It offers some of the best compression available, with HDR, wide color gamut and transparency.
- Best for
- High-performance websites, large hero images and photo galleries where every kilobyte counts.
- Strengths
- Very small files at high quality, 10- and 12-bit color, transparency.
- Limitations
- Slower to encode, and support in older browsers and image editors is still incomplete.
Frequently asked questions
Is the HEIC to AVIF conversion really free?
Yes. ConverterUp is fully free, with no signup, no watermarks, and no daily quota for the HEIC to AVIF converter. We support the project through unobtrusive ads.
Are my HEIC files uploaded to a server?
No. Conversion runs in your browser using WebAssembly. The HEIC bytes never leave your device, and we have no upload endpoint at all.
What is the maximum file size?
For HEIC input, the soft cap is 50 MB for images and 500 MB for video. Practical performance depends on your device's RAM.
Does converting HEIC to AVIF reduce quality?
No further quality is lost, because AVIF is lossless. The file will not look better than the HEIC source, though, and it will usually be larger.
Does AVIF keep the transparent background of my HEIC?
Yes. AVIF supports a full alpha channel, so transparency from the HEIC file is preserved.
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