01
Modern compression standards
AVIF typically achieves better compression efficiency than HEIC at equivalent perceived quality. The result is a smaller file that still looks or sounds the same to most listeners and viewers.
100% local
IMAGE
Convert HEIC
to AVIF
Modern compression standards.
AVIF typically achieves better compression efficiency than HEIC at equivalent perceived quality. The result is a smaller file that still looks or sounds the same to most listeners and viewers.
— Drop area
WHY CONVERT
Why convert HEIC to AVIF
02
Broader cross-platform support
AVIF is accepted by a wider range of image viewers, editors, and content systems than HEIC. The conversion removes a recurring compatibility friction without changing what the file actually contains.
03
Lower storage and bandwidth cost
AVIF files are typically smaller than their HEIC counterparts, which reduces hosting, transfer, and storage costs at scale. The savings compound when serving the same content to many recipients.
— How to convert
HEIC to AVIF in three steps.
- 01
Open LocalConvert
Visit this page on any modern browser — no install, no signup, no plugin.
- 02
Drop or select your HEIC file
Drag your HEIC into the drop area, or click to pick one from your device.
- 03
Click Convert
Conversion runs entirely in your browser. When it's done, your AVIF file downloads to your device.
QUALITY & FIDELITY
Quality and fidelity
- Lossy to lossy: a second generation of compression artifacts is possible.
- Transparency is preserved.
- Metadata (EXIF/tags) is preserved where the source provides it.
Transparency HEIC
✓ AVIF
✓
Color depth 10-bit RGB(A) 10/12-bit RGBA, HDR
Metadata preserved ✓
FORMAT SPECS
Format specifications
| HEIC | AVIF | |
|---|---|---|
| Extensions | .heic .heif | .avif |
| MIME types | image/heic image/heif | image/avif |
| Introduced | 2015 | 2019 |
| Maintainer | MPEG / ISO/IEC | Alliance for Open Media |
| Magic # | — | — |
| Spec | View spec ↗ | View spec ↗ |
COMPATIBILITY
Where these formats work
| Platform | Windows | macOS | iOS | Android | Chrome | Firefox | Safari | Edge |
|---|---|---|---|---|---|---|---|---|
| HEIC | Plugin | Native | Native | App | — | — | Native | Plugin |
| AVIF | App | Native | Native | Native | Native | Native | Native | Native |
HEIC
- Windows
- Plugin
- macOS
- Native
- iOS
- Native
- Android
- App
- Chrome
- —
- Firefox
- —
- Safari
- Native
- Edge
- Plugin
AVIF
- Windows
- App
- macOS
- Native
- iOS
- Native
- Android
- Native
- Chrome
- Native
- Firefox
- Native
- Safari
- Native
- Edge
- Native
Why LocalConvert
How LocalConvert compares
| Category | LocalConvert | Cloud converters |
|---|---|---|
| PRIVACY | Files never leave your device. The whole pipeline runs in your browser via WebAssembly. | Files travel to a remote server, sit in queue storage, and may be retained for analytics or moderation. |
| COST | Free, no signup, no daily quotas. | Often free for small files; paid tiers for batch / large / commercial use. |
| LIMITS | Limited only by your device's memory and CPU. Multi-GB files OK on desktop. | Typical 100 MB to 1 GB per-file caps, plus rate limits. |
— The formats
From · HEIC
High Efficiency Image Container
Apple's default photo format on iPhones since iOS 11. Smaller files than JPEG with comparable quality, but limited cross-platform support.
Typical uses
iPhone photos, iCloud Photo Library.
To · AVIF
AV1 Image File Format
A next-generation image format with exceptional compression, alpha, and HDR support. Roughly half the size of comparable JPEG.
Typical uses
Optimized web delivery, modern browsers, photography portfolios.
— FAQ
Frequently asked.
Is HEIC to AVIF conversion free?
Yes. LocalConvert is completely free, with no signup and no per-file or per-day limits.
Do my files get uploaded anywhere?
No. HEIC to AVIF conversion happens entirely inside your browser using WebAssembly — your file never leaves your device.
What's the maximum file size?
There's no fixed cap — the practical limit is your device's available memory. Very large files may take longer or fail on low-RAM devices.
Does it work offline?
Yes — once the page has loaded, HEIC to AVIF conversion works without an internet connection. Re-open the page once to cache it.
Will conversion preserve quality?
LocalConvert uses the industry-standard tools (FFmpeg, ImageMagick, Pandoc) — quality matches what professionals use on the command line. Lossy formats will still lose some quality on each re-encode.
— Related
Or convert these.
Browse all conversionsREFERENCES
Format references
Last verified:
100% local conversion.
HEIC to AVIF is processed in your browser with WebAssembly. No upload, no tracking, no limits. Your file never leaves your device.