Is my image uploaded to a server?

No. The entire conversion happens locally in your browser using the heic2any JavaScript library and the Canvas API. Your image never leaves your device.

HEIC (High Efficiency Image Container) is the default photo format used by iPhones since iOS 11. It uses HEIF compression, which produces smaller files than JPEG at similar quality, but is not widely supported outside Apple ecosystems.

AVIF (AV1 Image File Format) is a modern image format based on the AV1 video codec. It offers excellent compression — often 50% smaller than JPEG at the same quality — and is supported by Chrome, Firefox, Edge, and Safari 16+.

Why does the tool say "PNG-encoded" instead of true AVIF?

AVIF encoding via the Canvas API (canvas.toBlob("image/avif")) requires Chromium 94+ or Firefox 93+. Safari does not yet support AVIF export from Canvas. When the browser lacks support, the tool outputs a PNG-encoded file with an .avif extension and shows a notice. Use Chrome or Edge for native AVIF output.

Can I convert HEIF files too?

Yes. HEIC and HEIF are closely related formats and both are accepted. Files with .heic or .heif extensions work with this tool.

What image quality is used?

The tool uses 85% quality (0.85) for the Canvas encoding step, which provides a good balance between file size and visual fidelity for AVIF output.

HEIC to AVIF Converter

Name: HEIC to AVIF Converter
Availability: InStock
Author: Nham Vu

Upload a HEIC or HEIF image and download it as an AVIF file — fully client-side, private, and free.

Select HEIC / HEIF Image

Drop HEIC / HEIF here or browse Supports .heic and .heif files

Output preview

Convert to see preview

Summary

Upload a HEIC or HEIF image and download it as an AVIF file — fully client-side, private, and free.

How it works

Click "Choose HEIC File" or drag and drop a .heic or .heif file onto the upload area.
The heic2any library decodes the HEIC/HEIF container inside your browser — nothing is sent to a server.
The decoded image is drawn onto a Canvas element.
Canvas attempts to encode the image as AVIF (image/avif). If the browser supports native AVIF encoding the result is a true AVIF file.
If AVIF encoding is not supported, the image is exported as PNG inside an .avif-named file and a note is shown.
Click "Download AVIF" to save the converted file to your device.

Use cases

Convert iPhone HEIC photos to AVIF for use in modern web projects.
Compress HEIC images into the highly efficient AVIF format for faster page loads.
Convert HEIC files for platforms that accept AVIF but not HEIC.
Prepare HEIC photos for social media or CMS platforms that support AVIF.
Avoid installing desktop software just to convert a few iPhone photos.
Ensure HEIC images from new iOS devices are web-compatible.

Frequently Asked Questions

Last updated: 2026-06-09 · Reviewed by Nham Vu