Choosing between WebP and PNG depends on your specific needs. PNG has been the go-to format for lossless images with transparency for decades, while WebP is the modern challenger that offers smaller files with the same features. Let’s break it down.
At a Glance
| Feature | PNG | WebP |
|---|---|---|
| File Size | Larger | 25-35% smaller |
| Compression | Lossless only | Lossy + Lossless |
| Transparency | Yes (full alpha) | Yes (full alpha) |
| Animation | APNG only | Yes (built-in) |
| Browser Support | Universal (100%) | 96%+ modern browsers |
| Editing Support | Excellent (all tools) | Good (most modern tools) |
| Progressive Decode | Interlaced PNG only | Yes |
| Best Use Case | Editing, universal sharing | Web publishing, optimization |
File Size Comparison
WebP consistently produces smaller files than PNG:
In our tests, a typical screenshot (1920×1080) is ~1.2MB as PNG, ~890KB as lossless WebP, and ~540KB as lossy WebP at 85% quality — with no visible quality loss.
Transparency Support
PNG Transparency
PNG supports 8-bit alpha channels, giving you 256 levels of transparency. This is the gold standard for transparent images and is universally supported. However, transparent PNGs can be very large.
WebP Transparency
WebP also supports 8-bit alpha channels with the same quality as PNG. The key difference: transparent WebP files are typically 22% smaller than equivalent transparent PNGs.
When to Use Which
Choose PNG When:
- You need maximum compatibility (email, older software)
- You’re editing images in Photoshop, GIMP, or Figma
- You need pixel-perfect lossless quality for graphics
- You’re sharing images with users who might have older browsers
- You need metadata preservation for professional workflows
Choose WebP When:
- You’re publishing images on a website
- Page speed and Core Web Vitals matter
- You want smaller file sizes with the same quality
- You need animated images (much better than GIF)
- Your audience uses modern browsers (96%+ coverage)
- You want both lossy and lossless options from one format
Recommended Workflow
For most web projects, the optimal workflow is:
- 1Design and edit in PNG for maximum compatibility and quality
- 2Convert final assets to WebP for web deployment using a tool like PixConvert
- 3Use the HTML
<picture>element to serve WebP to modern browsers and PNG as fallback
The Verdict
WebP is the better choice for the web. It offers the same features as PNG (transparency, lossless compression) with significantly smaller file sizes. With 96%+ browser support, there’s little reason not to use WebP for web images.
PNG remains the king of compatibility. For editing, sharing via email, or any scenario where you need guaranteed universal support, PNG is still the safest choice. It’s also preferred for professional print workflows.
The good news: you don’t have to choose just one. Convert your source PNGs to WebP for web deployment, and keep the originals for editing. PixConvert makes this conversion instant and completely private.