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JPG (or JPEG) has been the dominant image format for web photos since 1992. WebP, released by Google in 2010, was built specifically for modern web performance. The two formats differ significantly in compression efficiency, image quality, transparency support, and browser compatibility. This guide breaks down every key difference so you can choose the right format for your project.
WebP wins decisively here. According to Google’s own benchmarks, lossy WebP images are 25–34% smaller than comparable JPGs at equivalent visual quality. For websites serving thousands of images—think e-commerce stores or news sites—switching to WebP can meaningfully cut bandwidth costs and improve Core Web Vitals scores.
JPG uses Discrete Cosine Transform (DCT) compression, which introduces blocky artifacts at low bitrates. WebP uses a more advanced predictive coding method derived from the VP8 video codec. The result: at the same file size, WebP generally delivers sharper edges, less banding, and better fine-detail retention—especially noticeable in text overlaid on photos.
JPG does not support transparency at all. Any transparent area is filled with a solid color (usually white). WebP supports alpha-channel transparency in both lossy and lossless modes, making it a capable replacement for PNG in many use cases—and typically producing smaller files than PNG.
JPG is universally supported across every browser, OS, and device ever made. WebP now enjoys support in Chrome, Firefox, Safari 14+, and Edge, covering over 97% of global web traffic. Only very old iOS versions and Internet Explorer lack support.
Choose JPG when you need maximum compatibility, are sending images via email, or are integrating with legacy systems. Choose WebP when building performance-focused websites, serving images to modern browsers, running an e-commerce site, or when you need both transparency and compression in a single format.
| Feature | JPG | WebP |
|---|---|---|
| Compression efficiency | Moderate | Excellent (25–34% smaller than JPG) |
| Lossy image quality | Good | Better at same file size |
| Lossless compression | No | Yes |
| Transparency (alpha) | No | Yes |
| Animation | No | Yes |
| Browser support | Universal | 97%+ (excludes old IE/iOS) |
| Best for | General use, email | Web, e-commerce |
For modern websites, WebP is the better choice—smaller files, better quality, and transparency support in one format. If you need universal compatibility or must integrate with legacy tools, JPG remains the safe default. Many production sites serve WebP with a JPG fallback to get the best of both worlds.
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