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Add HEIC files
Drop a single HEIC or a batch of files into the converter. Files are identified from raw byte signatures, not file extensions.
HEIC to AVIF Converter
Convert HEIC to AVIF online for free. Re-encode HEIC to AVIF — similar compression, but AVIF actually opens in browsers. Fast, 100% private, and processed directly in your browser with zero server uploads.
Convertto
Drop HEIC images here, or click to choose files
Processed locally in your browser · Zero server uploads
ReadsPNG, JPG, WebP, GIF, BMP, SVG, AVIF, ICO, HEIC, TIFF, JPEG XL
WritesJPG, PNG, WebP, AVIF, JPEG XL, GIF, BMP, TIFF, ICO, PDF
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In-Browser Conversion
What is HEIC to AVIF Converter?
AVIF is the next-generation web image format derived from the AV1 video codec. Converting HEIC to AVIF slashes file sizes by up to 50% compared to legacy image formats while preserving sharp textures, high dynamic range, and full browser compatibility.
iPhone HEIC Photo ConversionHEIC to AVIF Processing
Client-side HEIC workflow: Drop your iPhone HEIC photos, convert directly in browser memory, and download compatible AVIF files with zero uploads.
Technical Architecture100% In-Browser Memory Pipeline
Input Format.heic
HEIC
libheif WebAssembly decoder parses file bytes locally.
Engine: libheifZero upload
Local MemoryWASM / RAM
Uncompressed Pixels
Decoded into raw RGBA buffer inside your browser tab memory. No cloud roundtrips or server queues.
RAM Security100% Private
Target Format.avif
AVIF
The smallest web format — typically 20–50% under WebP.
Engine: libavifDirect export
End-to-end local architecture: Files are processed strictly within your device's memory and never leave your computer or phone.
How to convert HEIC to AVIF
Convert your files in three simple steps directly in your browser:
02
Convert to AVIF
libheif decodes the HEIC locally, then writes AVIF at original pixel dimensions in browser memory.
03
Download AVIF
Save individual converted AVIF files, or download the entire batch as a single ZIP archive.
Key Advantages
Why Convert HEIC to AVIF Locally?
Experience fast, secure, and lossless conversion with our privacy-first browser architecture.
Privacy & SecurityZero Uploads
100% Private In-Browser Processing
Your HEIC photos are decoded and encoded directly inside your browser tab memory. No files are ever sent to remote cloud servers, keeping your personal photos and sensitive documents completely secure.
Zero network transmission - Complete local security
Fidelity & EngineOptimized AVIF
Pixel-Perfect Visual Quality
AVIF is written at quality 58 on libavif scale, roughly a visual match for a high-quality JPG at half the bytes or less. No browser can encode AVIF, so the page loads libavif compiled to WebAssembly (≈3.3 MB) the first time you pick it, then runs it on a background thread. Later files in the same session reuse it.
Original dimensions preserved - No watermarks
ArchitectureWASM Pipeline
How the Conversion Pipeline Works
The conversion executes in two discrete steps inside this browser tab: first, the HEIC source is decoded into uncompressed raw pixels in memory. Second, those raw pixels are re-encoded into valid AVIF format without quality degradation.
SpecificationsStandards
Format & Privacy Guarantees
- •Dimensions: Exact pixel resolution is retained.
- •Transparency: Alpha transparency is preserved.
- •Metadata: EXIF & GPS location tags are stripped for complete privacy.
Full compliance with web standard image codecs
Continue with another image tool
After checking an image, choose a tool for the change you need. Each tool has a different purpose.
Compress Images to KB or MB
Reduce file size to fit a KB or MB limit. Compression may also reduce pixel dimensions to reach your target.
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Image Resizer and Social Media Sizes
Change pixel width and height for a website, print layout or social media preset. Enlarging an image does not restore missing detail.
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Metadata Remover
Need to strip or edit EXIF before sharing? Open Metadata Remover to remove GPS, camera data and other hidden fields.
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Image Size Finder
Check pixel width, height, megapixels and aspect ratio instantly for one image or a full batch.
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Related Image Converters
Explore more image conversion options for HEIC, AVIF, and other popular web formats.
More HEIC Converters
Convert your HEIC files into other popular image formats:
HEIC to AVIF FAQ
How do I convert HEIC to AVIF?
Drop your HEIC file into the tool above, then download the AVIF. Everything runs in your browser - your image is never uploaded to a server.
Is converting HEIC to AVIF free?
Yes. There is no signup, no watermark and no limit on the number of files.
Will I lose quality converting HEIC to AVIF?
AVIF is written at quality 58 on libavif scale, roughly a visual match for a high-quality JPG at half the bytes or less.
What is the difference between HEIC and AVIF?
Re-encode HEIC to AVIF — similar compression, but AVIF actually opens in browsers. The smallest web format — typically 20–50% under WebP.
Does converting HEIC to AVIF need a plugin or an install?
No. No browser can encode AVIF, so the page loads libavif compiled to WebAssembly (≈3.3 MB) the first time you pick it, then runs it on a background thread. Later files in the same session reuse it. Reading HEIC also happens locally, through libheif.
Is transparency kept in the AVIF?
Yes. If the HEIC has an alpha channel it carries through to the AVIF.
Is EXIF and GPS data kept in the AVIF?
No. Conversion goes through raw pixels, so EXIF, GPS coordinates, IPTC and XMP are all dropped. That is usually what you want before sharing a photo - but if you need to keep the format and only remove metadata, use the Metadata Remover instead.
Free & Private In-Browser Tool
Convert HEIC to AVIF Online Now
Fast, 100% private, and completely free in-browser converter. Drop your HEIC files and download optimized AVIF in seconds.