Convert PNG to WebP (Free, No Upload)
Convert PNG images to modern, smaller WebP. Everything runs on your device; files are never uploaded.
Drop PNG images here
Each file is converted to WebP instantly.
Files are processed on your device. Nothing is uploaded.
The web-publishing format, by the numbers
WebP was designed by Google specifically to make web pages lighter, and for PNG sources it’s usually the single biggest size win available. PNG’s lossless storage is the right choice while you’re editing, but it’s heavy to ship: a 1.5 MB PNG screenshot becomes a 200-400 KB WebP that looks the same, and unlike a JPG conversion, your transparency comes along for the ride.
| PNG | JPG | WebP | |
|---|---|---|---|
| Transparency | Yes | No (flattened) | Yes |
| Compression | Lossless, large | Lossy, small | Lossy, 25 – 35% smaller than JPG |
| Best at | Editing, logos, masters | Universal compatibility | Web pages, modern apps |
| Weak spot | File size | Sharp text edges, no alpha | Old software, picky forms |
The conversion happens in your browser: the PNG is decoded, drawn to a canvas, and re-encoded as WebP at 0.92 quality with the browser’s own encoder. Nothing uploads, nothing is watermarked, and the only size limit is your device’s memory.
Why this beats PNG to JPG for the web
Both conversions shrink the file, so the choice comes down to two questions. Does the image have transparency? And where is it going?
Transparency is the decisive one. A product photo with a cut-out background, a logo overlay, a UI element with rounded corners: convert any of these to JPG and the transparent areas turn solid white, which looks broken on a dark page. WebP keeps the alpha channel, so it’s the only small-file option for transparent images short of staying with PNG.
For destination, WebP wins anywhere a browser does the displaying: your own website, a blog, a web app, an online store. Pages serve faster, image CDN bills drop, and Core Web Vitals improve, which is why most large sites already serve WebP. Where it loses is the long tail of older software. Some government and enterprise upload forms still answer “invalid file type”, and a few aging desktop programs open it as gibberish. When that happens, PNG to JPG is the compatibility play, and WebP to PNG gets you back out of WebP if a file you already converted hits one of those walls.
A practical publishing workflow
For images headed to a website, do the steps in this order. Crop and edit while the file is still PNG, so no lossy step happens mid-edit. Then bring the dimensions down with the image resizer; serving a 3000-pixel image into an 800-pixel slot wastes more bytes than any format choice can save. Convert to WebP last, as the final step out the door, so the image is only lossy-encoded once.
Screenshots for documentation deserve a special mention: they’re the perfect WebP customer. PNG screenshots are bulky, JPG fuzzes the text, and WebP handles sharp letter edges well at a fraction of the PNG’s size. If yours come out of this tool still larger than you’d like, the image compressor accepts WebP input and lets you pick a lower quality setting yourself.
Frequently asked questions
Does WebP keep my PNG's transparency?
Yes. WebP has a full alpha channel, so transparent and semi-transparent areas survive the conversion intact. This is the big advantage over converting to JPG, which flattens everything onto a white background.
How much smaller will the WebP be?
It depends on the content. A PNG screenshot often shrinks 60-85%. Compared with JPG at the same visual quality, WebP runs 25-35% smaller, so it usually beats both formats for anything headed to the web.
Is the conversion lossy?
Yes, the output is lossy WebP encoded at 0.92 quality, a high setting that's visually indistinguishable at normal viewing sizes. If you need every pixel bit-exact, keep the PNG; that's what lossless formats are for.
Will everyone be able to open a WebP file?
Every modern browser displays it, and so do current Windows, macOS, and phone photo viewers. The holdouts are older desktop software and some strict upload forms. If a form rejects WebP, convert to JPG instead; that one works everywhere.
Can I get the PNG back later?
You can convert WebP back to PNG anytime, and transparency survives the round trip. What won't come back is the small amount of detail the lossy encoding discarded, so keep the original PNG if it's a master copy.