WebP vs PNG:File Size vs Lossless Quality
WebP's size advantage versus PNG's lossless quality and universal compatibility — when to switch to WebP and when to stick with PNG.
For web images where smaller files and faster loading matter, use WebP — it supports lossy and lossless modes, transparency and typically delivers notably smaller files than PNG at equivalent quality. For maximum compatibility, archival-quality lossless output, or files that need to open in older software, use PNG. Both support transparency; the key difference is file size and compatibility.
WebP vs PNG at a Glance
| Dimension | WebP | PNG |
|---|---|---|
| File size | Generally smaller | Larger |
| Compression | Lossy or lossless (your choice) | Lossless only |
| Transparency | Supported | Supported |
| Compatibility | All major browsers; occasional issues with older apps | Universal across virtually all devices |
| Lossless fidelity ceiling | Excellent | Best-in-class |
| Best for | Web performance optimization | Universal / archival / legacy environments |
How to Choose
WebP's lossless mode preserves transparency while typically producing smaller files than PNG — making it an excellent choice for transparent UI graphics and interface elements on the web, reducing payload without sacrificing visual quality.
PNG still has its place
"Opens everywhere" and absolute lossless fidelity are PNG's strengths. For external distribution, files that need to be read by a wide range of legacy software, or assets requiring bit-perfect preservation, PNG remains the reliable, conservative choice.
Which to Use and When
Website transparent graphics
Use WebP — lossless, transparent and smaller.
External sharing / legacy software
Use PNG — the most universally compatible option.
Archiving / bit-perfect fidelity
Use PNG — the gold standard for lossless preservation.
For modern browsers where file size matters, use WebP (lossless mode supports transparency too). For the widest compatibility, legacy software support or archiving, use PNG. On the web, you can serve WebP with PNG as a fallback for the best of both worlds.
Convert & Learn More
WebP vs PNG FAQ
Lossless WebP is smaller in most cases, and it also supports transparency. Exceptionally simple flat-color graphics may be comparable or slightly favor PNG.
No. WebP supports alpha transparency — converting from a transparent PNG to WebP preserves the transparency.
All major modern browsers do. Very old environments or some desktop applications may not — PNG is the reliable fallback in those cases.