png → webp
PNG to WebP, for anything going on a web page
If the destination is a website, WebP wins comfortably: much smaller than PNG, transparency preserved, and visually indistinguishable at sensible settings.
Processed on your own hardware · never transmitted, never stored
What happens when you drop a file in
The file stays put. Your browser opens it the same way an image viewer would. There is no transfer, which is why there is no upload bar to watch.
An encoder arrives once. The first job on this site pulls down a compiled build of FFmpeg, roughly 30 MB. It is kept afterwards, so every job after the first starts immediately.
Your own hardware does the job. The work happens in this tab, on your processor. A laptop from the last few years handles short clips in well under real time.
The result lands in Downloads. Assembled in memory and handed straight to your browser. Close the tab and every trace of it is gone.
Why the web converged on this
WebP outperforms both formats it displaced — meaningfully smaller than PNG for graphics, smaller than JPEG for photographs, at a quality difference most people cannot identify in a side-by-side test.
Crucially, and unlike JPEG, it keeps transparency. That is what allowed it to replace PNG outright rather than sit beside it, and it is why adoption happened so quickly.
The effect on loading time is not marginal. Images account for the bulk of what a typical page downloads, so cutting them substantially is the single most productive thing anyone can do about page speed.
Where it remains the wrong answer
For a file a person will download and open in their own software, WebP manufactures exactly the friction that sends people to the reverse converter. Use it for what appears on a page; stay with PNG or JPEG for anything handed to a human being.
Common questions
Does transparency survive?
Yes, WebP has an alpha channel and it comes through intact.
How much smaller?
For flat-colour graphics, frequently a quarter to a half of the PNG. For photographs it usually beats JPEG too.
Is support universal?
Among current browsers, yes. Very old versions lack it, which is why some sites still provide a fallback.
Is my file uploaded?
No, the conversion runs in your browser.