Compress WebP images online.

What does this WebP compressor do?

This tool compresses WebP images using Google's libwebp encoder compiled to WebAssembly. WebP is Google's modern image format designed to replace JPEG, PNG, and GIF with a single format that offers superior compression across the board. A WebP image is typically 25-35% smaller than an equivalent JPEG and 26% smaller than PNG — all while supporting transparency and animation. Our compressor gives you fine-grained control over every encoding parameter.

Many tools save WebP with suboptimal settings — quality 90+ when 75 would be indistinguishable, or compression method 2 when method 6 would save another 15%. Our compressor lets you re-encode existing WebP images with optimal settings. For example, a WebP at quality 85, method 4 might be 180 KB. The same image at quality 75, method 6 drops to 120 KB — a 33% reduction — with minimal visible difference.

When to use WebP compression

WebP is ideal for modern websites that want the smallest possible images without sacrificing quality. It supports lossy and lossless compression, transparency (alpha channel), and animation — covering use cases that previously required separate JPEG, PNG, and GIF files. Use WebP for hero images, product photos, and artwork on production websites. It is particularly valuable for mobile visitors where bandwidth is limited.

If you need maximum compatibility with older browsers, our JPEG compressor or PNG compressor are safer choices. For the absolute best compression efficiency (50% smaller than WebP), consider AVIF, though its browser support is still growing.

Benefits of WebP compression

Superior compression: 25-35% smaller than JPEG at the same quality. Transparency support: Full alpha channel, unlike JPEG. Animation: Supports animated images like GIF but with much smaller file sizes. Fine-grained control: Adjust quality, method, alpha quality, and filtering. Browser support: Over 97% of global browsers support WebP. Lossless mode: Pixel-perfect compression for screenshots and graphics.

Supported formats

Our compressor accepts JPEG, PNG, WebP, AVIF, GIF, SVG, HEIC, and TIFF as input. Output is optimized WebP. All processing happens in your browser — no files are ever uploaded to a server.

Privacy and speed

All WebP compression runs locally via WebAssembly. Your images never touch a server. Processing is parallelized across all available CPU cores — even the slower method 6 settings benefit from batch parallelism. There are no file size limits and no registration required.

Tips for best WebP compression results

Quality 75-80 is the sweet spot for WebP — visually lossless but much smaller than the original. Use method 4 for a good balance of speed and compression density. For maximum compression (batch jobs, archival), use method 6 — it takes longer but squeezes out every byte. Enable alpha channel optimization for images with transparency. If you are converting from JPEG, save the original JPEG as a fallback for older browsers. Need to resize your images first? Use our image resizer.

WebP achieves its compression advantage through predictive coding — a fundamentally different approach from JPEG's discrete cosine transform (DCT). While JPEG processes 8x8 pixel blocks independently using frequency-domain math, WebP's VP8 encoder looks at neighboring pixels to predict what each block should contain, then stores only the difference between the prediction and the actual image. This prediction step is remarkably effective on smooth gradients and flat areas — precisely where JPEG tends to introduce blocking artifacts. The result is cleaner-looking images at lower bitrates, especially for modern web graphics with large uniform backgrounds, soft gradients, and text overlays where JPEG's 8x8 block boundaries become visible.

The bandwidth savings from switching to WebP are substantial at scale. Consider a site with 100,000 monthly visitors and 10 images per page averaging 150 KB as JPEGs. That is 150 GB of image data transferred per month. Converting those images to WebP at the same visual quality reduces each file to roughly 100 KB — a 33% savings — bringing the total down to 100 GB per month. At typical CDN bandwidth pricing of $0.08/GB, that translates to $4,000 in annual savings on data transfer alone, plus faster page loads that directly improve Core Web Vitals and search rankings. For high-traffic e-commerce and media sites, those numbers scale into the tens of thousands of dollars per year.

To serve WebP without breaking support for older browsers, pair it with the native <picture> element. The pattern is straightforward: list the WebP source first inside an <source> element with type="image/webp", then provide a JPEG or PNG fallback inside a standard <img> tag. Browsers that support WebP will load the first matching source and ignore the fallback; older browsers skip the unknown <source> and fall through to the <img>. This technique also works with srcset for responsive images, so you can combine format optimization with art direction and resolution switching — getting both modern compression and universal compatibility from a single markup pattern.

How to compress a WebP — step by step

1. Drop your image. Drag any image format onto the upload area. 2. Configure. Adjust quality, method, and mode (lossy/lossless). 3. Preview. Use the comparison slider to check quality around edges and gradients. 4. Download. Save individual files or everything as a ZIP.

Want to resize, crop, or rotate your images before compressing? Explore all our image tools.