WebP Guide

Tutorials & Tools

Image Format Comparison Calculator

Compare file sizes, quality, and browser support across WebP, JPG, PNG, and AVIF formats. Calculate potential savings for your website.

0.1 MB20 MB
1500

JPG

Current
Per Image
5.00 MB
Total
100.00 MB
Quality: 85/100
Support: 100%

PNG

Per Image
7.00 MB
Total
140.00 MB
Quality: 100/100
Support: 100%

WebP

Per Image
3.50 MB
Total
70.00 MB
↓ 30.0% smaller
Quality: 92/100
Support: 96.5%

AVIF

Per Image
2.50 MB
Total
50.00 MB
↓ 50.0% smaller
Quality: 95/100
Support: 85.2%

Estimated Bandwidth Savings

Converting to WebP

Monthly (1K views):29.30 GB
Yearly:351.56 GB
Total Savings:30.0%

Converting to AVIF

Monthly (1K views):48.83 GB
Yearly:585.94 GB
Total Savings:50.0%

* Based on 1,000 monthly page views. Scale accordingly for your traffic.

💡 Recommendation

Converting to WebP could save 30.0% bandwidth. For maximum savings, use AVIF (50.0% reduction) with WebP and JPG fallbacks.

Understanding Image Format Comparisons

Choosing the right image format can dramatically impact your website's performance. This calculator helps you understand the trade-offs between different formats based on real-world compression ratios and quality metrics.

Format Characteristics

WebP

  • • 25-35% smaller than JPG for photos
  • • 26% smaller than PNG for transparent images
  • • Supports both lossy and lossless compression
  • • 96%+ browser support (as of 2024)
  • • Best for: Modern websites, photos, graphics

AVIF

  • • 50% smaller than JPG at same quality
  • • Superior compression to WebP
  • • HDR and wide color gamut support
  • • ~85% browser support (growing rapidly)
  • • Best for: Cutting-edge sites, high-quality photos

JPG/JPEG

  • • Lossy compression optimized for photos
  • • Universal browser support (100%)
  • • No transparency support
  • • Mature format with predictable behavior
  • • Best for: Fallbacks, legacy support, photos

PNG

  • • Lossless compression
  • • Full transparency support
  • • Larger file sizes than WebP/AVIF
  • • Universal browser support (100%)
  • • Best for: Logos, icons, graphics with text

Compression Ratios Explained

The calculator uses industry-standard compression ratios based on Google's research and real-world testing:

  • WebP vs JPG: 25-35% size reduction (we use 30% average)
  • WebP vs PNG: 26% smaller for transparent images
  • AVIF vs JPG: 50% size reduction at equivalent quality
  • AVIF vs WebP: 20% additional compression

Real-World Impact

Converting your images to modern formats can have significant benefits:

30-50%
Bandwidth Savings
20-40%
Faster Page Loads
15-25%
SEO Score Boost

Best Practices

  1. Use modern formats with fallbacks: Serve WebP/AVIF to supported browsers, JPG/PNG to others
  2. Implement responsive images: Use <picture> element for format and size variations
  3. Test quality settings: Lower quality often produces imperceptible differences at 30-50% smaller sizes
  4. Consider CDN conversion: Use image CDNs that automatically serve optimal formats
  5. Monitor browser support: Track your analytics to determine when to drop fallbacks

💡 Pro Tip: For maximum compatibility and performance, serve AVIF to supported browsers, WebP as fallback, and JPG/PNG for legacy browsers. This can be automated with the <picture> element or CDN configurations.

Example Implementation

<picture>
  <source srcset="image.avif" type="image/avif">
  <source srcset="image.webp" type="image/webp">
  <img src="image.jpg" alt="Description" loading="lazy">
</picture>

<!-- Browser automatically selects the first supported format -->

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