Convert PNG to WebP
This is usually the conversion with nothing to give up. WebP keeps everything PNG is chosen for — transparency, hard edges holding up cleanly — while producing a meaningfully smaller file, which is why it's the right default for almost anything going on a web page.
Add a PNG here and it converts straight to WebP — the output is already set. WebP keeps transparency the way PNG does, but a photographic PNG typically shrinks 80–90%, and even flat graphics usually come out smaller. It's supported by every current browser. Nothing is uploaded.
- Nothing uploadedRuns on your device
- No limitsNo account, no watermark
- No upload waitStarts immediately
What stays, and what actually shrinks
Transparency carries over exactly. WebP has its own alpha channel, so a logo or icon with a transparent background converts without any visible change beyond the smaller file.
The size drop is largest on photographs stored as PNG, which is a wasteful combination to begin with — PNG has to store every pixel exactly even though a photograph doesn't need that. A screenshot or icon with few colours saves less, simply because PNG already compresses that kind of image efficiently.
- Best candidate: a photograph currently stored as PNG — the size drop is largest here
- Still worth doing on icons and screenshots, just for a smaller win
- Page-load time is a ranking factor, and an oversized PNG hero image is a common cause of it
Nothing is uploaded to convert it
The conversion runs on your own device. Your image is decoded and re-encoded in the browser tab and the result is written back — no copy of it, at any stage, is ever sent anywhere.
You can confirm it: open the Network tab before you start, or disconnect from the internet once the page has loaded and convert anyway. The only thing that needs a connection is the first load of the page itself.
Questions
- Does WebP keep transparency like PNG?
- Yes. WebP has its own alpha channel, so a transparent background converts across without change — this is not the same conversion as PNG to JPG, which loses it entirely.
- How much smaller will the file be?
- For a photograph stored as PNG, typically 80–90% smaller. Icons and flat graphics save less, because PNG is already efficient at compressing that kind of image, but WebP is rarely larger.
- Will every browser display it?
- Every current browser has supported WebP since 2020, Safari included. The remaining gap is older desktop software and some email clients, which is a reason to keep the PNG for those specific uses, not a reason to avoid WebP on the web.
- Is this a lossless conversion?
- WebP supports both. This tool uses lossy WebP by default because it produces the largest size saving with no visible difference at normal viewing sizes — exactly the trade a PNG-heavy web page benefits from.
- Is my image uploaded to convert it?
- No. The conversion runs entirely in your browser — check the Network tab while it runs, or disconnect after the page loads and it still works.
Converting a different way
Or use Convert Image directly if you'd rather choose the output format yourself.