Compress WebP Images Online — Smaller Files From an Already-Efficient Format
WebP is the most efficient image format most browsers support. Google developed it specifically to beat JPEG and PNG at their own jobs — smaller files for the same perceived quality, with transparency support that JPEG never had. So why would you need to compress a WebP further? Because "efficient format" and "efficiently exported" aren't the same thing.
The export quality problem
Design tools like Figma, Sketch, and Adobe XD export WebP files at 80–100% quality by default. A full-page export from Figma at 100% WebP quality can be 2–4MB. That's small by PNG standards, but it's still way more than you need for web display. Re-encoding that file at 75% quality typically drops it to 400–800KB with zero visible difference at normal screen sizes. The VP8 encoder inside your browser is the same codec used by Chrome's built-in WebP encoder, so you're compressing with a proper, standards-compliant implementation — not an approximation.
The quality slider maps directly to the VP8 quality parameter, which controls the trade-off between file size and reconstruction accuracy. At 75%, the encoder discards prediction residuals that contribute almost nothing to perceived image quality. At 60%, you'll see very slight softening in areas with fine texture. At 40% and below, artifacts become visible in photo content, though logos and flat-color graphics hold up better at lower settings because they have simpler frequency content.
Lossy WebP vs lossless WebP — what this tool does
WebP has two distinct modes. Lossless WebP works like a better PNG — perfect reproduction, no quality loss, but file sizes are similar to or larger than PNG for photographs. Lossy WebP uses VP8 block prediction and DCT-based residual encoding, similar in concept to JPEG but with a more modern transform that handles smooth gradients better and avoids the ringing artifacts JPEG produces near sharp edges.
This compressor uses lossy WebP output, which is the correct choice for photographs, product images, hero images, and most web graphics. If your original is a lossless WebP screenshot or icon, the output will be lossy — so you'll want to check the preview at your chosen quality setting before downloading. For screenshots with text, 85–90% quality preserves readability well. For photos, 70–80% is the practical sweet spot.
Transparency is preserved at any quality setting
Unlike JPEG, lossy WebP supports a full alpha channel. A transparent logo exported as WebP stays transparent after compression. The alpha channel data is encoded separately from the color data in the WebP container, and the browser's toBlob('image/webp') call preserves it correctly. You can compress a transparent WebP at 50% quality and the alpha channel remains intact — only the color quality is affected.
This makes WebP genuinely useful as a replacement for transparent PNGs. A 400×400 transparent logo PNG that's 180KB can often be re-exported as a lossy WebP at 85% quality and come out at 30–50KB with no visible difference. The tool runs 100% in-browser so your files stay on your device throughout. For converting between formats, the WebP to JPG converter handles that. For more general multi-format compression, the image compressor accepts WebP alongside JPG and PNG. If the file is still too large after compression, the image resizer lets you reduce dimensions.
When compressing WebP won't get you far
WebP files that were already exported at 70–80% quality from a well-optimized pipeline don't have much room left to shrink. If your input is a 95KB WebP and you're targeting 60KB, that's a 37% reduction — achievable. If your input is a 38KB WebP that came from a tool that already applied 75% quality, you're unlikely to get meaningfully smaller without visible degradation. The tool's fallback logic checks whether each output is actually smaller than the input and steps down through lower quality levels automatically, so you'll always get the best result available without overshooting.
Choosing between WebP and JPEG for your workflow
If you're compressing images specifically for a modern website and browser compatibility isn't a constraint, WebP is nearly always the better output format. At equivalent visual quality, lossy WebP files run 25–35% smaller than JPEG. That difference adds up across a site with dozens of product images or a blog with hundreds of posts. If your compressed WebP images need to be shared via email, opened in desktop apps, or used in older CMS platforms, JPEG is more universally supported. For that conversion, the WebP to JPG converter handles it cleanly. For adjusting dimensions separately from quality, use the image resizer before compressing to avoid paying twice for both resolution and encoding overhead.