PNG vs WebP: Which Should You Use?
PNG and WebP both support transparency. WebP lossless is usually smaller, but PNG wins on universal support. Learn which fits each job.
Compare lossless PNG against WebP for graphics and transparency, covering both WebP lossless and lossy modes. For most web graphics WebP saves size, while PNG stays the safe default for broad compatibility.
How it works
The short answer
Both formats support transparency and crisp edges, but WebP is usually 20 to 40 percent smaller than PNG for the same graphic. WebP also offers a lossy mode that shrinks photographic graphics further. PNG remains the safest choice where support is uncertain, such as email and legacy systems.
How PNG works
PNG is a lossless format that stores every pixel exactly, which keeps logos, icons and screenshots razor sharp. It compresses large areas of flat color very well, which is why simple graphics stay compact. Its downsides are larger files for photos and no animation.
How WebP handles graphics
WebP has a lossless mode that matches PNG quality and is usually smaller for the same graphic. It also has a lossy mode for images with gradients or photographic detail, where it shrinks files further while still supporting transparency.
File size comparison
For identical graphics, WebP lossless typically beats PNG by 20 to 40 percent. The gap grows for images with gradients, where PNG stores every intermediate shade but WebP encodes more efficiently. For photos with transparency, WebP lossy wins by the largest margin.
Transparency and quality
Both formats support full alpha transparency, so either can replace a PNG on a colored website background. WebP lossless keeps the same pixel exact quality as PNG, while WebP lossy trades a little detail for a much smaller file that is still transparent.
Compatibility
PNG works in every browser, editor and email client ever made. WebP works in all modern browsers but is still missing from some legacy tools. If you control the page, WebP is safe; if the file travels anywhere, PNG is the reliable default.
A practical rule
Use PNG for files that must open everywhere and for archival copies. Use WebP for graphics served on your own site to cut bytes. Convert PNG to WebP lossless on this site to keep the same quality in a smaller file.
Format comparison
| Format | Compression | Transparency | Browser support | Best for |
|---|---|---|---|---|
| PNG.png | Lossless (keeps every pixel) | Yes | All browsers and devices | Screenshots, logos, illustrations with sharp edges and transparency |
| WebP.webp | Lossy (discards some detail) | Yes | All modern browsers (2011+) | Web images that need both quality and small file size |
Frequently asked questions
Is WebP always smaller than PNG?
Usually yes, and WebP lossless keeps the same quality with a smaller file for most graphics. Simple flat graphics see the smallest gain.
Does WebP lossless match PNG quality?
Yes, WebP lossless stores every pixel exactly like PNG, so there is no visible quality difference, just a smaller file in most cases.
Can I keep transparency when converting PNG to WebP?
Yes, WebP preserves the alpha channel, so transparent areas stay transparent through conversion.
When should I stay with PNG?
Stay with PNG for email, legacy software and any place that must open the file without doubt. For your own web pages, WebP is the lighter choice.
Is PNG or WebP better for icons?
For simple flat icons both work, but WebP lossless is smaller. For crisp scalable icons, an SVG is better than either raster format.