100% Free No Upload Bulk Conversion

Bulk HEIF to AVIF Converter — Free, No Upload

Convert multiple HEIF files to AVIF instantly — all in your browser. No file limits, no watermarks, and completely private.

HEIF AVIF · ZIP

Bulk HEIF → AVIF Converter

Select files, convert, download ZIP — all locally

Drop HEIF files here or click to browse

Supports batch selection — convert hundreds of files

HEIF → AVIF ZIP

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✓ Conversion completed! All files converted successfully. Click Download ZIP to save them.

Why convert HEIF to AVIF?

Have you ever tried using a HEIF image on a platform that doesn't support it? That's frustrating. By converting to AVIF, you get a universally compatible lossy/lossless file that works everywhere. This conversion processes your files entirely in your browser using WebAssembly – no upload, no server, no privacy concerns. Perfect for sensitive or large batches.

Technical comparison: HEIF vs AVIF

Property	HEIF	AVIF
Full name	High Efficiency Image Format	AV1 Image File Format
Compression	Lossy	Lossy / Lossless
Color depth	10-bit HDR	12-bit HDR
Transparency	Yes	Yes
Web support	No	Yes
Developed by	MPEG Group (2015)	Alliance for Open Media (2019)
Best for	Apple devices — efficient storage	Next‑gen web images — superior compression

How to use — 3 simple steps

Select your HEIF files

Drag & drop or click to choose multiple HEIF images. No file size restrictions.

Start the conversion

Click "Convert to :to" — your files are processed locally using WebAssembly. No upload, no waiting.

Download ZIP archive

All converted AVIF files are bundled into a single ZIP. One click, everything saved.

Popular use cases for HEIF → AVIF

Make your HEIF images viewable on any device – convert to AVIF

Stop dealing with 'unsupported format' errors – use AVIF instead of HEIF

Batch rename and convert your HEIF collection to AVIF for a unified library

Improve your website's Google PageSpeed score by serving AVIF images

💡 Pro tips

Use WebP/AVIF for web — they load 30-50% faster than JPEG/PNG
Use the ZIP download to get all converted files in a single click
All processing is private — files are never uploaded to any server

Frequently Asked Questions

No watermarks, no ads, no branding. Completely clean output.

Typically 1-2 seconds per 5 MB image. Total ~2-3 minutes for 100 files.

Yes. Works on any device with a modern browser (Chrome, Safari, Firefox).

The converter will skip unreadable files and show an error. Only valid HEIF images are processed.

Bulk HEIF to AVIF Converter — Free, No Upload

Why convert HEIF to AVIF?

Technical comparison: HEIF vs AVIF

How to use — 3 simple steps

Popular use cases for HEIF → AVIF

💡 Pro tips

Frequently Asked Questions

Are there any watermarks added to my converted AVIF images?

How long does it take to convert 100 HEIF files to AVIF?

Can I convert HEIF to AVIF on my phone or tablet?

What if my HEIF file is corrupted or encrypted?

Other conversions from HEIF

Convert other formats to AVIF