Free PNG to WebP Converter
You have a PNG image that needs to be smaller for your website without losing visible quality. WebP is Google's modern image format that produces files 25 to 35% smaller than PNG at equivalent visual quality. You need a free PNG to WebP converter that handles this without uploading your images.
Drop your PNG below. OnlyFiles converts it to WebP entirely in your browser. Your image never leaves your device. No upload, no account, no watermark, no daily limit.
This free PNG to WebP converter is built for web developers, designers, and anyone who needs smaller image files for faster page loads.
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Why convert PNG to WebP with this free tool
WebP was developed by Google specifically for the web. It supports both lossy and lossless compression, and in both modes it produces smaller files than PNG and JPG at the same visual quality. Google's own testing shows WebP lossless images are 26% smaller than PNG.
For website owners, smaller images mean faster page loads. Faster page loads mean better user experience and higher search rankings. Google uses page speed as a ranking factor, and image optimization is one of the most impactful improvements you can make.
WebP also supports transparency, just like PNG. You do not lose alpha channel data when converting from PNG to WebP.
How the free PNG to WebP conversion works
The conversion uses the Canvas API in your browser. Your PNG image is loaded into a canvas element and exported in WebP format. The browser's native WebP encoder handles the compression.
If your PNG has a transparent background, the transparency is preserved in the WebP output. The Canvas API's WebP export uses a high quality setting that balances file size reduction with visual fidelity.
The process runs entirely in JavaScript. No server is contacted. No data leaves your device.
WebP browser support in 2026
WebP is supported by every major browser: Chrome, Firefox, Safari, Edge, and Opera. Safari added WebP support in version 14, released in 2020. As of 2026, there is no mainstream browser that does not support WebP.
The only scenario where WebP causes problems is in non-browser applications. Some older image editors, email clients, and desktop software do not open WebP files. For web use, WebP is universally supported. For document attachments and email, PNG or JPG may still be safer choices.
Common questions about free PNG to WebP conversion
How much smaller will the WebP file be?
WebP lossless images are typically 25 to 35% smaller than the same image in PNG. The exact reduction depends on image complexity. Simple graphics with solid colors see the largest reduction.
Does WebP preserve PNG transparency?
Yes. WebP supports alpha transparency. Transparent areas in your PNG remain transparent in the WebP output.
Should I use WebP for all my website images?
For new web projects, yes. WebP is supported by all modern browsers and produces smaller files than both PNG and JPG. Serve WebP as your primary format and keep PNG or JPG as a fallback only if you need to support very old software.