Comparison
PNG vs. WebP: Lossless Clarity vs. Next-Gen Web Compression
PNG has long been the gold standard for alpha transparency and lossless graphics. Google designed WebP Lossless to directly replace PNG by leveraging advanced entropy coding (spatial prediction and color cache), shrinking assets significantly without quality loss.
PNG (Portable Network Graphics) vs WebP (Lossless & Lossy Alpha)
The Short Answer
WebP is typically 26% smaller than PNG in lossless mode while preserving pixel-perfect alpha transparency. Convert PNG to WebP for modern web apps, keeping PNG primarily for raw source assets and legacy print software.
Feature by Feature
| Feature | PNG (Portable Network Graphics) | WebP (Lossless & Lossy Alpha) | Better here |
|---|---|---|---|
| Lossless Compression | Deflate (LZ77 + Huffman) | Spatial Prediction + Color Transform (26% smaller) | WebP (Lossless & Lossy Alpha) |
| Alpha Transparency | Full 8-bit & 24-bit Alpha | Full 8-bit Alpha in Lossless & Lossy | Evenly matched |
| Animation Support | APNG (Limited support) | Animated WebP (Widely supported) | WebP (Lossless & Lossy Alpha) |
| Google Core Web Vitals | Often triggers "Serve images in next-gen formats" | Fully passes PageSpeed Audits | WebP (Lossless & Lossy Alpha) |
| Universal Compatibility | 100% (All platforms since 1996) | 97.4% (All modern browsers) | PNG (Portable Network Graphics) |
| Encoding Speed | Fast CPU encode | Slightly higher encode time, faster decode | PNG (Portable Network Graphics) |
Pros and Cons
PNG Advantages & Limitations
Strengths
- Universal desktop and legacy software support
- Unsurpassed vector/screenshot pixel fidelity
- Extensive editing tools ecosystem
Trade-offs
- High bandwidth consumption
- Significantly larger payloads slow mobile LCP
- No native lossy compression mode
WebP Advantages & Limitations
Strengths
- 26% smaller files than equivalent PNGs
- Supports both lossless and lossy compression with alpha
- Reduces bandwidth and hosting costs
Trade-offs
- Older legacy image editors may require conversion plugins
Related Reading
How to Compress JPG Images for Fast Web LoadingHow to Use PNG to JPG Converter Online: Step-by-Step GuideHow to Use PNG to WebP Converter Online: Step-by-Step GuideHow to Use WebP to PNG Converter Online: Step-by-Step GuideJPG vs. PNG: Which Image Format Should You Use?JPG vs. WebP: Next-Gen Image Optimization Benchmark
Tools for This Job
Frequently Asked Questions
No. When using WebP Lossless mode, pixels remain bit-for-bit identical to the source PNG file.
Yes. WebP includes full alpha channel transparency support in both its lossless and lossy compression modes.