WebP images load faster without looking worse — which is exactly why most of the web has quietly switched to them. Drop a JPG or PNG into the converter below to see the size difference for yourself: everything happens locally in your browser, so nothing you upload here ever leaves your machine.
How to use the WebP converter #
- Drag an image onto the drop zone above, or click it to browse for a file.
- The converter encodes it to WebP immediately and shows both file sizes plus the size reduction in %.
- Drag the slider across the preview to compare the original against the WebP version at any point in the image.
- Adjust the compression quality slider to trade file size for image quality — watch the sizes update as you drag.
- Click Download WebP to save the result. The file keeps the original name, just with a
.webpextension.
Everything runs client-side using the
<canvas>element's built-in WebP encoder. No image is ever sent to a server, which also means there's no upload wait, no file size limit beyond what your browser can hold in memory, and nothing to clean up afterwards.
What is WebP? #
WebP is an image format developed by Google that supports both lossy and lossless compression, plus transparency and animation — covering what JPG, PNG and GIF each do separately. At equivalent visual quality, lossy WebP files are typically 25–35% smaller than a comparable JPG, and lossless WebP files are usually smaller than the same image saved as PNG.
Smaller image files mean faster page loads, less bandwidth for visitors on mobile data, and a better score on tools like Lighthouse and PageSpeed Insights — which is why WebP has become a default recommendation for web images over the last few years.
Lossy vs. lossless, and why there's a quality slider
WebP's lossy mode works like JPG: it discards some image detail to save space, and you choose how aggressively via a quality setting. Lower quality means a smaller file but more visible compression artifacts, especially around sharp edges and fine text. The quality slider in the tool above maps directly to that setting, so you can find the point where the file gets meaningfully smaller without the image looking noticeably worse — the compare slider makes that trade-off easy to see rather than guess at.
Browser support
Every current major browser — Chrome, Firefox, Safari, and Edge — can both display and encode WebP images, including this tool's in-browser conversion. If you're targeting very old browsers you may still want a fallback in a <picture> element, but for everyday use WebP is safe to rely on directly.
Where this comes in handy
Use this converter whenever you're publishing images to the web: photos for a blog post, product shots for a store, or screenshots for documentation. Converting to WebP before upload is one of the simplest ways to cut page weight without touching any code, and comparing the result here first means you're not shipping a compression setting you haven't actually looked at.