Convert PNG to WebP — Free and In Your Browser
The single biggest size win available to a PNG on a web page.
Drop a file here
or click to choose a file
Runs on your device Your file is processed by your own browser and is never uploaded to a server.
Short answer
A PNG can be converted to WebP in a browser without uploading it. The saving is unusually large for this pair — a photographic PNG typically loses 70% or more of its weight — because a PNG stores every pixel losslessly while WebP can compress the same picture the way JPEG does, but with the transparency PNG was chosen for in the first place.
At a glance
| Accepts | PNG |
|---|---|
| Produces | WebP (lossy, transparency kept) |
| Processing | In your browser |
| Price | Free, no limits |
| Account | Not required |
PNG is the format people reach for when an image needs a transparent background, and then they are stuck with lossless compression they never wanted. A screenshot or a cut-out product photo saved as PNG can easily be several megabytes for something that would be a couple of hundred kilobytes as WebP.
WebP is the format that resolves that: lossy compression and an alpha channel in the same file. If the PNG is a flat graphic — an icon, a diagram, a logo with a handful of colours — the gain is smaller, because that is the case PNG is genuinely good at. The gain is largest on photographs and screenshots.
How to use it
- 1
Add the PNG
Drop in one PNG file. It is processed on your device.
- 2
Choose quality and width
Balanced suits most images; capping the width shrinks it further.
- 3
Download the WebP
Serve it from your site in place of the PNG.
Frequently asked questions
Does the transparency survive?
Yes. WebP has a full alpha channel, so a transparent PNG converts to a transparent WebP at a fraction of the size.
How much smaller will it be?
For a photograph or screenshot saved as PNG, usually 70-90% smaller. For a flat icon with few colours the difference is much less, and occasionally the PNG wins.
Is the conversion lossy?
Yes, at the quality settings offered here. That is where the saving comes from — a lossless WebP is possible in principle but gives up most of the advantage over PNG.
Do all browsers support WebP?
Every current version of Chrome, Firefox, Edge and Safari, plus Android and iOS. Support outside browsers is weaker, which is why converting back to PNG is sometimes needed.