PNG to WebP Converter — Free, No Upload
Convert PNG images to WebP in your browser — high quality, no upload, files never leave your device. No upload — runs 100% in your browser
or click to browse
How to use this tool
- Drop a PNG file onto the box above (or click to browse).
- The tool decodes and re-encodes it locally — usually under a second.
- Click Download to save the WebP.
About the two formats
PNG: PNG uses lossless DEFLATE compression and supports full alpha transparency. It is the standard for screenshots, logos and graphics with sharp edges, but photographs stored as PNG are much larger than JPEG.
WebP: WebP is Google's format: it supports both lossy and lossless modes plus alpha transparency, and typically files 25-35% smaller than JPEG at the same visual quality. All modern browsers display it, but some older desktop software cannot.
What happens in this conversion
WebP is lossy, so the output is re-compressed — at the 92% quality used here the difference is normally invisible, but avoid converting the same file back and forth repeatedly.
Why “no upload” matters
Most online converters send your file to a server, convert it there, and hand it back — which means a copy of your photo sits on somebody else’s machine, and you are trusting their deletion policy. This page does the same job with the roles reversed: the conversion engine is downloaded to your browser once, and your file stays on your device the whole time. It also makes the tool faster on repeat use, because nothing travels over the network except this page itself.
Frequently Asked Questions
Are my files uploaded to a server?
No. Everything on this page runs inside your browser using JavaScript and WebAssembly. Your file never leaves your device — you can even disconnect from the internet after the page loads and the tool still works.
Will quality be lost?
WebP is lossy, so the output is re-compressed — at the 92% quality used here the difference is normally invisible, but avoid converting the same file back and forth repeatedly. The encoder here runs at 92% quality, which is visually indistinguishable from the source for normal use.
Does it work on my phone?
Yes — the converter runs entirely in the browser, so any recent iPhone, Android, Windows or Mac device works. Nothing is installed.
Is there a file size limit?
No hard limit; the practical limit is your device memory, since the image is decoded locally. Files of 20-50 MB convert fine on modern hardware.