WebP vs PNG: Which Image Format Should You Use?
If you work with images on the web, you have probably run into the WebP vs PNG question. Both formats support transparency. Both can produce sharp, high-quality images. But they handle compression very differently, and that difference matters a lot when page speed and bandwidth are on the line.
The short answer: use WebP for web images where file size matters, and PNG when you need universal compatibility or pixel-perfect lossless quality. Here is the full breakdown.
WebP vs PNG: Head-to-Head Comparison
| Feature | PNG | WebP |
|---|---|---|
| Compression | Lossless only | Lossy and lossless |
| File size (photo) | Large | ~26% smaller (lossless), ~70% smaller (lossy) |
| Transparency | Full alpha | Full alpha |
| Animation | No (APNG is non-standard) | Yes |
| Browser support | Universal (100%) | All modern browsers (97%+) |
| Color depth | Up to 48-bit | 8-bit |
| Best for | Screenshots, logos, graphics with text | Web photos, page speed optimization |
| Editing support | Universal | Most modern editors |
| Quality at low bitrate | N/A (lossless) | Good |
What Is PNG?
PNG (Portable Network Graphics) was introduced in 1996 as a patent-free replacement for GIF. It uses lossless compression, which means every pixel is preserved exactly as-is. No data is thrown away, no quality is lost, no matter how many times you save the file.
PNG supports full alpha transparency (not just on/off like GIF), making it the go-to format for logos, icons, screenshots, and graphics with text. It works in every browser, every image editor, and every operating system without exception.
The tradeoff is file size. Because PNG preserves every pixel, photo-quality images can be significantly larger than their lossy counterparts. A typical photograph saved as PNG might be 3-5x larger than the same image as JPG.
What Is WebP?
WebP was developed by Google in 2010 and released as an open format designed specifically for the web. Unlike PNG, WebP supports both lossy and lossless compression modes in a single format.
In lossy mode, WebP achieves files that are 25-34% smaller than JPG at equivalent visual quality. In lossless mode, WebP images are roughly 26% smaller than PNG. WebP also supports transparency and animation, making it a genuine all-in-one web format.
Browser support for WebP reached universal status when Safari added support in version 16 (2022). As of 2026, WebP and its newer competitor AVIF are supported in all modern browsers, covering over 97% of global web traffic.
When to Use PNG
PNG remains the right choice in several scenarios:
- Print and archival work. When you need a lossless format that every tool supports, PNG is the safe bet. No quality degradation, no compatibility surprises.
- Graphics with sharp text. Screenshots, diagrams, and UI mockups with text render crisply in PNG. Lossy compression can blur text edges.
- Logos and icons. Small, simple graphics with transparency are well-suited to PNG. The file size penalty is minimal for small images.
- Universal compatibility. If your images need to work in legacy email clients, old software, or systems you do not control, PNG is understood everywhere.
When to Use WebP
WebP is the better choice for most web-facing use cases:
- Website photographs. Lossy WebP produces visually identical photos at 25-34% smaller file sizes than JPG. That directly translates to faster page loads.
- Page speed optimization. If you are trying to hit Lighthouse performance targets, switching from PNG to WebP for non-critical images is one of the easiest wins.
- Modern web apps. Any project targeting current browsers can safely use WebP as the default image format.
- Images with transparency on the web. WebP supports alpha transparency with much smaller file sizes than PNG, making it ideal for product images, stickers, and overlays.
File Size: How Much Smaller Is WebP?
Google's own testing shows that WebP lossless images are 26% smaller than PNG. For lossy compression, WebP achieves 25-34% smaller files than JPG at equivalent SSIM quality index scores. In practice, the savings vary by image content:
- Photographs: WebP lossy saves 25-35% over JPG. WebP lossless saves 25-30% over PNG.
- Simple graphics: The gap narrows. For solid-color icons, PNG and WebP lossless are closer in size.
- Screenshots with text: WebP lossless typically saves 20-30% over PNG while keeping text perfectly sharp.
Browser Support in 2026
WebP is now supported in all modern browsers including Chrome, Firefox, Safari (16+), Edge, and Opera. Global browser support exceeds 97%. The only holdouts are Internet Explorer (end of life) and very old mobile browsers.
If you need to support legacy browsers, you can use the
The Verdict
For web images, WebP wins on file size with negligible quality trade-offs. For archival, print, or maximum compatibility, PNG remains the gold standard. Many teams use both: WebP for production web assets and PNG as the source/archival format.
Need to convert between the two? imageconvert.co handles it entirely in your browser with zero uploads and zero privacy risk.
Convert your PNG files to WebP now
Need to convert WebP back to PNG?