WebP is an open-standard raster image format developed by Google providing superior lossy and lossless compression with alpha transparency for web graphics.
WebP is an open-standard raster image format developed by Google in 2010. Engineered specifically for the web, WebP provides both lossy and lossless compression along with 8-bit alpha transparency (translucent backgrounds) and animation support. WebP images are typically 25% to 35% smaller than comparable JPEG files and 50% to 80% smaller than standard PNG files at equivalent visual quality.
Convert and optimize your web graphics in real time using our client-side Image Converter or reduce payload size with the Image Compressor.
| Specification | Details |
|---|---|
| Standard Developer | Google (Alliance for Open Media contributor) |
| MIME Media Type | image/webp |
| Standard File Extension | .webp |
| Container Architecture | Resource Interchange File Format (RIFF) |
| Lossy Codec | VP8 keyframe intra-prediction coding |
| Lossless Codec | VP8L (spatial transforms, color indexing, Huffman coding) |
| Color Space Support | 8-bit YCbCr 4:2:0 (Lossy) / 8-bit 32-bit ARGB (Lossless) |
| Alpha Transparency | Yes (8-bit alpha channel supported in both lossy and lossless) |
| Global Browser Support | ~98%+ (Universal across Chrome, Safari, Firefox, Edge, iOS, Android) |
WebP combines two distinct compression architectures depending on whether lossy or lossless mode is selected:
Lossy WebP adapts the keyframe compression mechanism from Google's VP8 video codec:
Lossless WebP uses a series of advanced reversible transforms to reduce entropy before encoding:
| Dimension | WebP | JPEG | PNG | AVIF |
|---|---|---|---|---|
| Compression Ratio | High (25–35% < JPEG) | Baseline (1.0x) | Low (Large bit depth) | Ultra High (50% < JPEG) |
| Lossless Mode | Yes (VP8L) | No | Yes (DEFLATE) | Yes (AV1 Lossless) |
| Alpha Channel | Yes (8-bit) | No | Yes (8-bit / 16-bit) | Yes (8/10/12-bit) |
| HDR / Wide Gamut | No (8-bit sRGB) | No (8-bit sRGB) | Partial (16-bit) | Yes (10/12-bit P3/Rec.2020) |
| Encoding Speed | Very Fast | Fast | Moderate | Slow / Resource-intensive |
| Decoding Speed | Fast | Fast | Fast | Moderate |
| Browser Support | 98%+ | 100% | 100% | ~95% |
<picture> ElementTo maximize web performance across all client devices, use the HTML5 <picture> element to negotiate modern formats while preserving graceful fallbacks:
<picture>
<!-- 1. Next-gen AVIF for maximum bandwidth savings on supporting browsers -->
<source srcset="hero.avif" type="image/avif" />
<!-- 2. Universal WebP modern default -->
<source srcset="hero.webp" type="image/webp" />
<!-- 3. Fallback JPEG for legacy email clients or older webviews -->
<img
src="hero.jpg"
alt="Developer Tooling Platform Dashboard"
width="1200"
height="675"
loading="lazy"
decoding="async"
/>
</picture>
Images represent the single largest contributor to web page weight. Converting PNG and JPEG graphics to WebP decreases byte transfer sizes by 50–80%, directly improving Largest Contentful Paint (LCP), reducing Time to Interactive (TTI), and boosting Google Core Web Vitals rankings.
Yes. Both lossy and lossless WebP formats fully support 8-bit alpha transparency channels. Unlike JPEG, which renders transparent backgrounds with black or white solid blocks, WebP allows smooth translucency and alpha feathering at a fraction of PNG file sizes.
Yes. WebP files can be decoded back into standard 32-bit RGBA pixel bitmaps and re-encoded into PNG or JPEG formats using our in-browser Image Converter.
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