Convert PNG to WebP
Re-encode a PNG as WebP and watch the file shrink — often by more than half — while transparency survives intact. The conversion runs on your own device, and the stamp shows exactly how many kilobytes you saved.
100% private — this tool runs in your browser. Your file is never uploaded to any server.
How it works
PNG stores every pixel losslessly, which is why screenshots and graphics saved as PNG grow so large. WebP encodes the same picture with modern compression, and this tool re-encodes on your device using your browser’s built-in encoder — the alpha channel is carried across, so transparent logos and cut-outs stay transparent. After converting, the stamp compares the WebP against your original byte-for-byte and reports the saving; if a particular image would come out larger (rare, but possible with tiny icons), you will see that honestly rather than a green stamp.
Step by step
Add your PNGs
Drop one or more PNG files, or tap to choose.
Pick a quality
Balanced suits the web; Highest for archival use.
Convert
Each file is re-encoded on your device.
Check the saving
The stamp shows old size, new size and percent saved — then download.
Frequently asked questions
Does converting PNG to WebP keep transparency?
Yes. WebP has a full alpha channel, and this tool copies it across, so transparent backgrounds, logos and cut-outs remain transparent. That is the main reason to pick WebP over JPG when shrinking a PNG.
How much smaller will my file get?
Screenshots and graphics typically shrink 40–80%; photographic PNGs often shrink more, because PNG is a poor fit for photos. The stamp on this page reports the exact before and after for your file rather than a promise.
Is WebP conversion here lossless?
No — browsers encode WebP lossily, which is what produces the large savings. At the Highest setting the differences are not visible at normal viewing size. If you need genuinely lossless output, keep the PNG.
Why did my WebP come out larger than the PNG?
It can happen with very small images or flat icons, where PNG is already near-optimal and WebP adds container overhead. The stamp will show the size increase honestly — in that case, keep the original.
Do all browsers support WebP now?
Every current browser — Chrome, Safari (14+), Firefox, Edge — displays WebP. The stragglers were old Safari and Internet Explorer, both long out of support. For a public website in 2026, WebP is safe to serve directly.
Can I convert several PNGs at once?
Yes — drop them together and each is converted and listed with its own saving and download button. There is no batch limit beyond your device’s memory.
Is my image uploaded during conversion?
No. The PNG is decoded and re-encoded by your own browser; nothing is transmitted. You can confirm it by watching the Network tab while converting — no upload request appears.
Should I use WebP or AVIF?
AVIF compresses slightly better but encodes far more slowly and support in tools is patchier. For web images today, WebP is the pragmatic choice; it is also what your browser can encode locally, which is why this tool can stay upload-free.