What this converter does
Drop your PNG files, choose a quality, and download WebP versions of them. The encoding runs in your browser through the same WebP encoder Chrome ships with, so the images stay on your computer and the conversion finishes as fast as your machine can draw them.
Where the savings come from
A PNG stores every pixel exactly as it was. That is perfect for archiving and wasteful for a web page, where nobody is inspecting your hero image at 400% zoom. WebP looks for detail your eye skips and spends fewer bytes on it. Photographs and screenshots with soft gradients shrink the most. Flat illustrations with a handful of colors were already efficient as PNG, so expect a smaller win there.
Each output tells you its size next to the original, so you can see the trade instead of guessing at it.
Good reasons to switch
- Page speed. Images are usually the heaviest thing a page downloads, and WebP is the single easiest cut to make.
- Largest Contentful Paint. The hero image is often the element Core Web Vitals measures, so shrinking it moves the score directly.
- Transparency comes along. WebP keeps the alpha channel, so logos and cut-outs stay clean over any background.
- Support is settled. Every current browser reads WebP, including Safari since version 14.
When to stay on PNG
Keep the PNG for print work, for archives, and for anything you will edit repeatedly. Lossy formats lose a little more each time you re-encode them. Screenshots full of small text are also worth checking at High before you ship them, because sharp letters are where lossy compression shows first.
Frequently asked questions
Do my files get uploaded?
No. Your browser does the encoding. The tool works offline once the page has loaded.
Which quality should I choose?
Medium suits most website images. Move to High when the picture has crisp text or fine line work. Small file exists for the times a size budget beats appearance.
Will transparency survive?
Yes. Alpha channels convert as they are, so a transparent background stays transparent.
Can WebP be lossless?
The format supports it, but the browser encoder behind this tool writes lossy WebP. For a byte-perfect copy, keep your PNG.
How much smaller will my file be?
It depends on the picture. Photos often land well under half their PNG size; simple graphics with flat color save far less. The tool prints the before and after for each file rather than a promise.
Can I convert many files at once?
Drop the whole set. Convert once, then download the files one by one or grab the zip.