Convert PNG to WebP
Drop a PNG file below and get a WebP back. The conversion happens on your own machine, so nothing is uploaded and there is no size or quantity limit beyond what your browser can hold in memory.
Drop images here
Ctrl/⌘ VPaste a screenshot or copied image
Accepts PNG
Lower means a smaller file. 75 is a good default for photos.
100% in your browser Files are never uploaded.
Why convert PNG to WebP?
For the same picture, WebP usually lands well under the size of the PNG original. That matters when you are trimming page weight or squeezing under an upload limit.
This one is almost always done on purpose rather than out of necessity: you are optimising a website and PNG is the heaviest thing on the page. WebP is the sensible modern replacement — it keeps transparency, it is supported by every browser people actually use, and it routinely cuts the file to a fraction of the PNG. Unlike most conversions on this site, this is one where you usually gain something and give up almost nothing.
Before you convert
Lossy or lossless changes everything about the result
WebP can do both. Lossless WebP typically saves 20 to 30 percent over PNG while remaining pixel-identical — the safe choice for logos, icons and line art where a single soft edge would be noticed. Lossy WebP can cut 70 percent or more, which is the right trade for photographs and large background images where nobody is inspecting individual pixels. Choosing wrong in either direction is the usual mistake: lossy on a crisp logo looks smeared, lossless on a photo wastes most of the benefit.
Browsers are fine with it; email and some platforms are not
Every current browser reads WebP, including Safari since version 14, so for anything displayed on a web page the compatibility question is settled. Outside the browser it is patchier: a number of email clients, some social platforms and plenty of desktop software still refuse it. Optimising a site is a good use of WebP; attaching one to an email to a client is asking for a confused reply.
Keep the PNG
If you go the lossy route, the WebP is a derivative, not a replacement. Formats keep moving — AVIF is already displacing WebP the way WebP displaced JPEG — and re-encoding from your lossless original will always beat re-encoding from a lossy copy. The PNG is your master; ship the WebP.
What carries over
- Transparency
- Pixel dimensions
- Every pixel, if you choose lossless
What does not
- Some detail, if you choose lossy
- Support in older desktop and email software
PNG vs WebP at a glance
| Property | PNG | WebP |
|---|---|---|
| Compression | Lossless | Lossy |
| Transparency | Yes | Yes |
| Typical file size | 300-500% of an equivalent JPEG | 65-75% of an equivalent JPEG |
| Compatibility | Opens everywhere, including decades-old software | Supported by all current browsers and most apps |
| Usually comes from | Screenshots, logos and graphics | Websites optimising page weight |
Frequently asked questions
Are my PNG files uploaded anywhere?
No. The decoder and encoder are WebAssembly modules that run inside this page. The network tab may show a codec downloading the first time you use a format, but no request contains your file. On supported browsers, a codec that has already been used is cached so the same conversion can work offline.
Is there a file size or quantity limit?
There is no limit imposed by us. The practical ceiling is your device’s memory, since the image has to be held uncompressed while converting. On a typical laptop, images up to around 100 megapixels convert without trouble.
Will converting to WebP lose quality?
WebP is a lossy format, so some data is discarded. At the default quality setting the difference is not visible at normal viewing sizes. If you need an exact copy of the pixels, choose PNG instead.
Does it work on a phone?
Yes. The same WebAssembly modules run on mobile browsers. Conversion is slower than on a desktop because phone CPUs are weaker, and very large images are more likely to hit memory limits.
My PNG is a screenshot — anything to watch for?
Screenshots are mostly flat colour and sharp text, which is what lossy formats handle worst. If the target is lossy, text edges can pick up faint halos. Use a high quality setting, or stay with PNG if the text has to remain crisp.
Is WebP safe to use on a website?
Yes. Every current browser supports it, which covers roughly 97% of visitors. The remaining gap is old software rather than old browsers — a few desktop image viewers and older CMS upload forms still refuse it.