WebP vs JPG: Which is Better for Websites?

What Are WebP and JPG?

WebP and JPG (JPEG) are two of the most widely used image formats on the web today. JPG has been the de facto standard for photographs since the early 1990s, while WebP was introduced by Google in 2010 as a modern alternative designed specifically for web performance. Understanding the differences between these formats is crucial for anyone building websites, running online stores, or managing digital content.

JPG uses lossy compression, discarding some image data to achieve smaller file sizes. WebP supports both lossy and lossless compression, and even transparency — making it a more versatile choice in many scenarios.

File Size Comparison: WebP vs JPG

The most compelling reason to choose WebP over JPG is file size. According to Google's own studies and numerous independent benchmarks, WebP achieves 25–35% smaller file sizes than JPG at equivalent visual quality. For lossless compression, WebP files are about 26% smaller than PNG equivalents.

What does this mean in practice? If your website currently serves 1MB of JPG images, switching to WebP could reduce that to roughly 650–750KB — a significant improvement for page load times, especially on mobile networks. Faster loading directly impacts user experience, bounce rates, and search engine rankings.

Quality: Can You Tell the Difference?

At moderate compression levels (quality 70–85), most people cannot distinguish between WebP and JPG in blind tests. Both formats produce visually similar results for photographs. However, at very high compression levels (quality below 50), WebP tends to show fewer blocking artifacts than JPG, producing smoother gradients and better detail preservation.

For graphics with sharp edges, text overlays, or large areas of solid color, WebP's lossless mode outperforms JPG significantly, since JPG was never designed for such content.

Browser Support for WebP

As of 2026, WebP is supported by over 97% of browsers worldwide, including Chrome, Firefox, Safari (since version 14), Edge, and Opera. The only notable exception is some older versions of Internet Explorer, which has negligible market share. In practical terms, WebP is safe to use on production websites.

For the remaining 3% of users, a simple JPG fallback ensures no one sees a broken image. This can be implemented with the <picture> element:

<picture>
  <source srcset="image.webp" type="image/webp">
  <img src="image.jpg" alt="Description">
</picture>

When to Use Each Format

Use WebP When:

• You want the smallest possible file size for web delivery
• You need both lossy and lossless compression in one format
• Your images require transparency (replacing PNG)
• You're optimizing for Core Web Vitals and page speed

Use JPG When:

• You need maximum compatibility with very old systems
• Your workflow tools don't yet support WebP export
• You're working with print media that requires standard formats

How to Convert JPG to WebP

Converting your existing JPG images to WebP is straightforward. You can use online tools like Image Toolbox for quick, browser-based conversion — no software installation needed. Simply upload your JPG, select WebP as the target format, adjust the quality slider, and download the result. All processing happens locally in your browser, so your images never leave your device.

For batch conversion, tools like cwebp (Google's command-line encoder), Squoosh, or ImageMagick can process hundreds of files at once.

Frequently Asked Questions