WebP vs PNG: Which Image Format Should You Use?
Software Developer · BSc Audio Technology
WebP vs PNG: Which Image Format Should You Use?
When comparing webp vs png, both formats support transparency and produce high-quality images — but they serve fundamentally different purposes. WebP prioritizes file size, delivering significantly smaller files for web delivery. PNG prioritizes lossless quality, preserving every pixel perfectly. Here's when to use each.
Quick Comparison
| Feature | WebP | PNG |
|---|---|---|
| Compression | Lossy and lossless | Lossless only |
| File size (photo) | 25–35% smaller than PNG | Larger |
| File size (graphic) | 25–50% smaller than PNG | Larger but pixel-perfect |
| Transparency | Yes | Yes |
| Animation | Yes | No (APNG is rare) |
| Browser support | All modern browsers | All browsers |
| Editor support | Growing but incomplete | Universal |
| Quality | Excellent (lossy mode loses tiny detail) | Perfect — no data loss ever |
When to Use WebP
WebP is the stronger choice whenever images are destined for the web. Its combination of lossy and lossless compression means you can tune the quality-to-size ratio for each use case.
- Website images where page speed matters — WebP loads noticeably faster than PNG equivalents.
- Photos and graphics served to browsers, since all modern browsers (Chrome, Firefox, Safari, Edge) support WebP natively.
- When you need the smallest file with acceptable visual quality, especially for mobile users on slower connections.
- Replacing JPG and PNG on web pages to improve Core Web Vitals scores like Largest Contentful Paint (LCP).
Ready to make the switch? Convert PNG to WebP with our free tool.
When to Use PNG
PNG remains essential for workflows that demand pixel-perfect accuracy or broad compatibility outside the browser.
- Editing and design work — PNG is lossless, so re-saving never introduces generation loss.
- When you need to open files in older software like Photoshop versions before 2022, older GIMP builds, or legacy publishing tools.
- Print preparation and archival storage, where pixel-perfect quality is non-negotiable.
- Screenshots and technical documentation, where sharp text edges and exact color reproduction matter.
- Embedding images in documents — Word, PowerPoint, and Google Docs handle PNG reliably.
Need to go the other direction? Convert WebP to PNG for maximum compatibility.
File Size Comparison
Real-world file sizes vary, but these examples illustrate the typical savings you can expect when switching between formats:
- Typical photo: PNG ~1.5 MB, WebP lossy ~400 KB, WebP lossless ~1.1 MB.
- Typical screenshot: PNG ~200 KB, WebP lossless ~150 KB.
- Logo with transparency: PNG ~15 KB, WebP ~10 KB.
The savings are most dramatic on photographic content, where WebP can cut file size by more than half. On simple graphics with flat colors and sharp edges, the gap narrows but WebP still comes out ahead.
The Verdict
The choice between WebP and PNG comes down to where and how the image will be used:
- Use WebP for web delivery — it is the better format for websites in every measurable way: smaller files, faster loads, and full browser support.
- Use PNG for editing, archival, print, and compatibility — its lossless compression and universal software support make it the safer choice outside the browser.
- For the best of both worlds, store your originals as PNG and serve web versions as WebP. This preserves quality in your master files while delivering optimal performance to visitors.
- If you want even better compression than WebP, consider AVIF — see how it compares to WebP.
Sources
- Google Developers — WebP — Official WebP documentation covering compression, features, and browser support
- Can I Use — WebP — Up-to-date browser compatibility data for the WebP image format
- W3C PNG Specification — Official W3C technical specification for the Portable Network Graphics format