The Complete WebP Guide for Web Developers
WebP is Google’s image format that has become the gold standard for web performance. If you’re not using it in 2025, you’re leaving free performance on the table.
The Numbers
| Format | Avg Size | Quality | Use Case |
|---|---|---|---|
| JPEG | 100% | Good | Legacy fallback |
| PNG | 120% | Lossless | Transparency, graphics |
| WebP | 65% | Excellent | Default for all images |
| AVIF | 50% | Excellent | Cutting-edge, slower encode |
Browser Support
WebP is supported by 97.5% of browsers as of 2025. The only holdouts are IE11 and very old Safari versions. For production, use the <picture> element with JPEG fallback.
<picture>
<source srcset="image.webp" type="image/webp">
<img src="image.jpg" alt="Description">
</picture>When to Use Each Format
- Photos with no transparency → WebP lossy
- Graphics, screenshots, text → WebP lossless (or PNG fallback)
- Maximum compression, long encode OK → AVIF
- Legacy compatibility required → JPEG/PNG
Converting at Scale
For existing image libraries:
- Batch convert with our Image Converter
- Use
<picture>for graceful fallback - Set up build-time conversion in your CI/CD
Quality Settings
- WebP photos: 75-85 quality (sweet spot)
- WebP lossless: Use for graphics with text
- Avoid quality < 60: Visible artifacts appear
Convert any image to WebP with our free converter.