How to convert PNG to WebP
Drop your PNG onto the box above, or click to select one. The tool shows the original size and dimensions, converts on your click, and shows the WebP size so you can see the saving before you download. Your image is decoded and re-encoded inside your browser tab, never uploaded.
When PNG to WebP is the right move
PNG is a heavy format for the web. It was designed for lossless storage, not for fast pages, and a hero image or product gallery saved as PNG can quietly add megabytes to a page. WebP was built by Google specifically to replace PNG and JPG on websites: it compresses the same image into a noticeably smaller file while keeping the alpha channel that made PNG indispensable for logos, overlays and product shots.
The practical effect is speed. Smaller images mean faster loading pages, better Core Web Vitals scores, less bandwidth for your visitors, and lower storage and CDN bills for you. For a site with many images, the conversion from PNG to WebP is one of the cheapest performance wins available, and it changes nothing about how the page looks.
How the conversion works
Your browser decodes the PNG into its full pixel grid, transparency included, then encodes that grid using the WebP format at high quality. WebP uses predictive compression: it guesses each pixel from its neighbors and stores only the difference, which is far more efficient than PNG methods on photographic content. Metadata from the PNG does not carry across, trimming a little extra weight from the file.
Quality tips for PNG to WebP
- Keep your PNG masters. WebP is for delivery, PNG is for the archive. If you ever need the image in print software or an older editor, the PNG is the one that will open.
- Compare at full size. Check the converted file at 100 percent zoom on text and edges. At the quality used here it should match the PNG, and checking once builds trust for the whole set.
- Convert the whole set, not one image. Mixed formats on a page look the same but load unevenly. Converting every PNG on the page gives the full speed benefit.
- Resize before converting. A 4000 pixel wide PNG shown at 800 pixels wastes more bytes than any format choice can save. Shrink dimensions first with the Image Resizer, then convert.
A worked example
A portfolio site loads twelve project screenshots as PNGs totaling 18 MB, and mobile visitors wait seconds for the gallery. The owner converts each screenshot here: the set comes back as WebP totaling just under 5 MB, visually identical, transparency and all. The gallery now appears almost instantly, and her PageSpeed score climbs out of the red.
Working with photos instead? The JPG to WebP converter does the same job for JPG files, and the Image Converter covers every direction.