Why WebP replaced PNG on the web
WebP was designed for exactly this job: delivering images over a network. On the same photograph it is usually 25–35% smaller than JPEG, and against PNG the gap is far wider still, because WebP can compress with loss where PNG never can.
Crucially, it does this without giving up an alpha channel. Before WebP, keeping transparency meant accepting PNG's file sizes. Now every browser in current use — Chrome, Firefox, Safari, Edge, and their mobile versions — renders WebP natively, so that trade-off is gone.
Why convert PNG to WebP?
- Core Web Vitals. Images are usually the heaviest thing on a page. Cutting their weight directly improves Largest Contentful Paint, which Google uses as a ranking signal.
- Transparency kept. Unlike JPEG, WebP has a full alpha channel, so logos and cut-outs survive the conversion intact.
- Lower bandwidth bills. On an image-heavy site or CDN, a large reduction in bytes served shows up directly on the invoice.
- Faster on mobile networks. Smaller images matter most on the slow, high-latency connections where visitors are quickest to leave.
- Same visual result. At sensible quality settings the difference from the PNG original is invisible at normal viewing size.
How to convert PNG to WebP
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Add your images
Drag one or more PNG files onto the drop area at the top of this page, or press Choose PNG files to pick them from your device. Each file appears in the list with a preview, its original name, pixel dimensions and file size.
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Convert
Press Convert to WebP. Your browser decodes each image, draws it to an HTML5 canvas and re-encodes it. Files are handled one at a time so the page stays responsive.
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Download
Press Download WebP next to any finished image, or Download all as ZIP to grab everything at once. Filenames keep their original stem, with the extension changed.
Choosing a quality level
The quality slider controls lossy WebP encoding. 85% is a sound default for photographs and complex graphics. For logos, icons, screenshots of text and line art, push it to 95–100%, where WebP still beats PNG on size but keeps edges perfectly crisp — lossy compression is unkind to sharp boundaries.
Transparency is preserved throughout, so there is no background colour to choose. Semi-transparent pixels come through with their alpha values intact.
Keep your PNG originals. WebP is a delivery format; if you will edit the image again later, edit the lossless source and re-export.
Privacy: nothing is uploaded
Most online converters send your file to a server, process it there and hand back a download link. This one does not. The page is a static site with no backend and no upload endpoint — your images are read from disk by the browser, decoded by the browser and re-encoded by the browser. They stay on your device.
A practical consequence: the tool keeps working offline once the page has loaded, and it is safe for images you would not want to hand to a third party. If you would like to verify the claim yourself, open your browser's developer tools, switch to the Network tab and run a conversion — you will see no request carrying your image. Read the full privacy policy for details on advertising cookies.
Frequently asked questions
How do I convert PNG to WebP?
Add your PNG files to the drop area, set a quality level if you want something other than 85%, press Convert to WebP, and download the results.
Does WebP keep PNG transparency?
Yes. WebP supports a full alpha channel, so transparent and semi-transparent areas are preserved exactly as they were in the PNG.
How much smaller will the WebP be?
For photographs and rich graphics, commonly 60–90% smaller than the PNG. For simple flat-colour icons the saving is more modest, since PNG is already efficient on that kind of content.
Do all browsers support WebP?
Yes. Every browser in current use renders WebP, including Safari since version 14 and all current mobile browsers. Support has not been a practical concern for several years.
Is WebP conversion lossy or lossless?
This tool writes lossy WebP, controlled by the quality slider. Set it to 100% for the highest fidelity, which is still typically much smaller than the source PNG.
Can I convert a whole folder of PNGs at once?
You can select as many files as you like in one go and convert them in a single pass, then download them together as a ZIP archive.
Are my images uploaded to a server?
No. The encoding runs on your own device using your browser's canvas. This site has no backend and no upload endpoint.
Is there a limit on image size?
There is no fixed file-size limit, but conversion is bounded by your device's memory and your browser's maximum canvas size. Images wider or taller than 16,384 pixels may fail — mobile Safari is the strictest here. The tool tells you when an image exceeds what your browser can handle.
Can I use this converter on mobile?
Yes. The page is responsive and works in mobile Chrome, Safari, Firefox and Edge. Very large images may fail on phones because of tighter memory limits.