PNG vs AVIF Compression - A Detailed Comparison

AVIF represents the cutting edge of image compression technology. This guide compares PNG and AVIF compression to help you understand when and why to convert your PNG files to AVIF format.

PNG vs AVIF: Compression Overview

How PNG Compression Works

PNG uses lossless compression (DEFLATE algorithm):

Characteristics:

• No data loss during compression
• Perfect pixel-for-pixel reproduction
• Limited compression ratio
• Best for graphics, not photographs

Result: Large files but perfect quality.

How AVIF Compression Works

AVIF uses the AV1 codec with advanced techniques:

Characteristics:

• Intra-frame prediction
• Transform coding
• Entropy coding
• Optional lossless mode
• Film grain synthesis

Result: Dramatically smaller files with excellent quality.

File Size Comparison

Real-world testing with various image types:

Photographs

Graphics with Transparency

Screenshots

Quality Comparison

At Equivalent Visual Quality

When targeting the same perceived quality:

At Various AVIF Quality Settings

When PNG Compression Wins

PNG is better for:

1. Perfect Pixel Accuracy

When every pixel must be exact:

• Technical diagrams
• Screenshots for documentation
• Reference images

2. Images Requiring Editing

For ongoing editing workflows:

• No quality loss on re-save
• Original data preserved
• Maximum flexibility

3. Maximum Compatibility

When you need 100% browser support:

• Email images
• Legacy system support
• Universal accessibility

When AVIF Compression Wins

AVIF is better for:

1. Web Publishing

For websites and apps:

• 80-90% smaller files
• Faster page loads
• Better Core Web Vitals

2. Storage Optimization

For large image libraries:

• Massive storage savings
• Reduced bandwidth costs
• Faster transfers

3. High-Resolution Content

For 4K and larger images:

• Practical file sizes
• Maintains detail
• Efficient delivery

Transparency Compression

Both support transparency, but compression differs:

Encoding and Decoding Speed

Recommendation: Encode once (during build), decode many times (when viewing).

Practical Conversion Guide

Converting PNG to AVIF

Use our PNG to AVIF converter:

1. Upload your PNG files
2. Select quality (85% recommended)
3. Download AVIF versions
4. Implement with PNG fallback

Recommended Settings

Implementation Strategy

HTML with Fallback

<picture>
  <source srcset="image.avif" type="image/avif">
  <source srcset="image.png" type="image/png">
  <img src="image.png" alt="Description">
</picture>

CSS Background

.hero {
  background-image: url('hero.png');
}

@supports (background-image: url('test.avif')) {
  .hero {
    background-image: url('hero.avif');
  }
}

Use Case Scenarios

Scenario 1: E-commerce Product Images

Converting 1000 product photos:

Scenario 2: Portfolio Website

Converting 50 high-res images:

Scenario 3: Mobile App Assets

Converting 200 UI elements:

Browser Support Considerations

Current global support: ~93%

Quality Assessment Tools

Compare PNG vs AVIF quality using:

1. SSIM (Structural Similarity) - Measures perceived quality
2. PSNR (Peak Signal-to-Noise Ratio) - Technical quality metric
3. Visual inspection - Side-by-side comparison
4. Butteraugli - Google's perceptual quality metric

Frequently Asked Questions

Is AVIF better than PNG?

For compression efficiency, yes. AVIF achieves 80-90% smaller files. PNG is better when you need perfect lossless quality or 100% browser compatibility.

Does converting PNG to AVIF lose quality?

With lossy AVIF, technically yes. But at 85%+ quality, the loss is imperceptible. You can also use lossless AVIF for perfect quality.

Should I replace all PNG with AVIF?

For web use, convert to AVIF with PNG fallback. Keep original PNG files for archiving and editing.

How much smaller is AVIF than PNG?

Typically 80-92% smaller for photographs, 75-85% smaller for graphics with transparency.

Does AVIF support transparency like PNG?

Yes! AVIF fully supports alpha channel transparency with excellent compression.

Conclusion

AVIF dramatically outperforms PNG in compression efficiency while maintaining excellent visual quality. For web publishing, converting PNG to AVIF offers:

• 80-90% file size reduction
• Maintained visual quality
• Transparency support
• Growing browser support

Use AVIF for web delivery, keep PNG for archiving and editing.

Convert PNG to AVIF →

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Related articles: PNG vs JPG Comparison | AVIF Compatibility Guide

Related tools: PNG to WebP | PNG to JPG | Image Compressor