PNG to WebP Converter
Convert PNG files to WebP instantly and privately. File Transmute runs entirely in your browser, so your PNG is never uploaded to any server.
Reviewed by Ismail Sab Ajnalkar · Updated July 2026
File converter
PNG is a lossless image format that supports transparency, making it best for logos, screenshots, and graphics with sharp edges. WebP is a modern image format that's roughly 25–35% smaller than JPG or PNG at similar quality, built for fast-loading websites. File Transmute turns your PNG into WebP right in your browser — no upload, no sign-up, and no daily limit. Because the conversion runs on your own device, even sensitive files stay private, and it keeps working offline once the page has loaded.
Best for
- Shrinking PNG images to speed up a website or app
- Cutting image weight while keeping a transparent background
- Getting a smaller file than PNG without switching to lossy JPG
Good to know
WebP is smaller than PNG at similar quality and keeps transparency, which makes it ideal for the web. The trade-off is compatibility: very old browsers and some legacy desktop apps don't read WebP — keep a PNG or JPG fallback where that matters.
How to convert PNG → WebP
Drop your PNG file into the converter above — it stays on your device.
Choose WebP as the output. File Transmute picks the smartest settings automatically.
Click Convert and download your WebP file instantly.