HEIC to AVIF Compression - Understanding the Compression Advantage

When it comes to image compression, AVIF represents the cutting edge. Converting HEIC to AVIF can deliver even better compression while maintaining excellent image quality. This guide explores the compression advantages in detail.

Understanding Modern Image Compression

How HEIC Compresses Images

HEIC uses the HEVC (H.265) codec:

• Intra-frame prediction
• Transform coding
• Entropy coding
• 10-bit color depth support

Result: 40–50% smaller than JPG at comparable quality.

How AVIF Compresses Images

AVIF uses the AV1 codec:

• Advanced intra-frame prediction
• Larger transform sizes
• Better entropy coding
• Film grain synthesis
• 10/12-bit color depth

Result: 50%+ smaller than JPG and 20–30% smaller than HEIC.

Compression Comparison: Real Data

Tested with a 24-megapixel photo:

AVIF wins, delivering the smallest file while maintaining excellent visual quality.

Why AVIF Compresses Better Than HEIC

1. Larger Block Sizes

AVIF supports block sizes up to 128×128 pixels, compared to 64×64 for HEIC:

• Handles large uniform areas more efficiently
• More efficient encoding
• Fewer block artifacts

2. Advanced Prediction Modes

AVIF offers more prediction options:

• 56 directional intra modes (vs 35 in HEIC)
• Better handling of diagonal edges
• Improved texture prediction

3. Film Grain Synthesis

AVIF can strip film grain during encoding and reapply it during decoding:

• Significant bit savings
• Preserves the visual appearance
• Especially effective for photographs

4. Better Entropy Coding

AVIF's entropy coder is more efficient:

• Improved symbol coding
• Better context modeling
• Reduced redundancy

Quality vs File Size Analysis

High Quality (90%+)

Both formats look nearly identical to the original.

Medium Quality (75–85%)

AVIF achieves better compression with a slightly higher quality score.

Lower Quality (60–70%)

AVIF excels at low bitrates, with noticeably better quality.

Practical Compression Scenarios

Scenario 1: Web Photo Gallery (1,000 Photos)

Converting a photo collection:

AVIF savings: 3.1 GB of storage and noticeably faster website performance.

Scenario 2: Mobile App Assets

For a mobile app with 500 images:

AVIF advantage: Smaller app, faster install, less storage usage.

Scenario 3: Email Attachments

Sending 10 high-resolution photos:

AVIF advantage: Stays below the typical email attachment limit.

Compression Settings Guide

Maximum Compression

When file size is the priority:

Quality: 65–70%
Expected savings: 70–80% vs JPG
Best for: Thumbnails, previews, bandwidth-constrained use

Balanced Results

When you need good quality and small files:

Quality: 75–85%
Expected savings: 55–65% vs JPG
Best for: Web publishing, social media, general use

Highest Quality

When quality matters most:

Quality: 90–95%
Expected savings: 40–50% vs JPG
Best for: Archival, professional use, printing

Color Depth and HDR Compression

AVIF excels with high-bit-depth content:

8-Bit Content

• HEIC: Excellent compression
• AVIF: 15–20% better compression

10-Bit Content

• HEIC: Good compression
• AVIF: 25–30% better compression

HDR Content

• HEIC: Decent compression
• AVIF: 35%+ better compression

Transparency Compression

Both formats support transparency, but AVIF compresses it more efficiently:

AVIF saves an extra 30–40% over HEIC for transparent images.

Encoding Speed Considerations

Better compression comes at a cost:

Recommendation: Encode once (at conversion time), decode many times (when viewing).

When the Compression Advantage Matters Most

High-Traffic Websites

• Lower bandwidth costs
• Faster page loads
• Better SEO scores
• Improved user experience

Storage-Constrained Devices

• More photos in the same space
• Extended device lifespan
• Lower cloud storage costs

Bandwidth-Limited Users

• Faster loading on slow connections
• Lower data usage
• Better global accessibility

Converting HEIC to AVIF

To take advantage of AVIF's compression benefits:

1. Upload your HEIC files to our HEIC to AVIF converter
2. Choose quality settings based on your needs
3. Download the compressed AVIF files
4. Use on your website for maximum benefit

FAQ

How much smaller is AVIF than HEIC?

Typically 20–35% smaller at comparable quality. The difference is more pronounced at medium and low quality settings.

Does better compression mean worse quality?

No. AVIF achieves better compression through smarter algorithms, not by discarding more data. Quality is typically equal to or better than HEIC.

Should I convert all my HEIC files to AVIF for storage?

For the web, yes. For personal archival, consider keeping the original HEIC files since they are already efficient and universally readable on Apple devices.

Is AVIF compression lossless?

AVIF supports both lossy and lossless compression. Lossless AVIF is smaller than PNG but larger than lossy AVIF.

Summary

AVIF's compression advantages make it an excellent choice when converting from HEIC:

• 20–35% smaller than HEIC
• Better quality at the same file size
• Growing browser support for the web

Convert your HEIC photos to AVIF today and experience the best in modern compression technology.

Convert HEIC to AVIF →

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Related tools: HEIC to JPG | HEIC to WebP | Compress Image