WebP vs PNG — Which Image Format Is Better for Web?
WebP is Google's modern image format designed to replace both PNG and JPG on the web. Here's how it compares to PNG for transparency, quality, and file size.
Quick Answer
Use WebP for web images — it's 26% smaller than PNG with the same quality and transparency support. Use PNG for maximum compatibility outside browsers (print, desktop apps, archival).
WebP vs PNG Comparison Table
| Feature | WebP | PNG |
|---|---|---|
| Lossless Size | 26% smaller than PNG | Baseline |
| Lossy Mode | Yes (excellent) | No |
| Transparency | Yes (lossy + lossless) | Yes (lossless only) |
| Animation | Yes | APNG (limited) |
| Browser Support | All modern (2020+) | Universal |
| Non-Browser Support | Growing | Universal |
| Color Depth | 8-bit per channel | Up to 16-bit per channel |
| Encoding Speed | Slower | Faster |
| Web Performance | Excellent | Good |
| SEO Impact | Better (smaller files) | Heavier pages |
Key Differences Explained
File Size Savings
WebP lossless images are 26% smaller than PNG files on average (according to Google's own testing). WebP lossy images with transparency are 3x smaller than equivalent PNG images. For websites serving thousands of images, switching from PNG to WebP can save gigabytes of bandwidth monthly.
Transparency with Lossy Compression
WebP's unique advantage: it supports transparency even in lossy mode. PNG can only be lossless, meaning transparent PNGs are always large. With WebP, you can have a semi-transparent image at 1/3 the file size of an equivalent PNG. This is invaluable for product images, UI elements, and overlays.
When PNG Is Still Better
PNG remains the better choice for: archival/preservation (wider tool support), print workflows, 16-bit color depth requirements, desktop application icons, and situations where you need guaranteed compatibility with older software. For anything displayed in a web browser, WebP wins.
Frequently Asked Questions
Is WebP better than PNG?
For web use, yes. WebP lossless is 26% smaller. WebP also supports lossy+transparency which PNG cannot do. For non-web use, PNG has broader compatibility.
Does WebP support transparency?
Yes, WebP fully supports alpha transparency in both lossy and lossless modes — unlike PNG which only supports lossless transparency.
Do all browsers support WebP?
Yes. Chrome, Firefox, Safari (14+), and Edge all support WebP. Safari was the last holdout, adding support in September 2020. WebP is now safe to use universally.
Convert PNG to WebP Free
Convert your PNG images to WebP for 26% smaller files. Browser-based, free, no signup.