PNG to WebP Converter

Convert PNGs to modern WebP for dramatically smaller web images — adjustable quality, bulk files, all on your device.

Drop PNG files here

or — multiple files welcome. Nothing is uploaded; conversion happens on your device.

Files are processed entirely in your browser — never uploaded, never stored. Large photos convert in about a second each; the first HEIC file loads a small decoder module.

Runs fully in your browser — images are never uploaded or stored.

Frequently asked questions

How much smaller is WebP than PNG?

For photos and screenshots, lossy WebP at 85% quality is typically 70–90% smaller than PNG. For graphics with few colors the gap narrows but WebP still usually wins. Transparency is preserved either way.

Should I use WebP on my website?

Yes — every modern browser supports it, and smaller images directly improve Core Web Vitals and conversion rates. Keep PNG originals as your editing masters and serve WebP.

Are my images uploaded to a server?

No. Conversion runs entirely in your browser using its built-in image engine — files never leave your device, which also makes it faster than upload-based converters and safe for private photos.

Embed this calculator

Free to embed on your site. The attribution link back to this page is required — please keep it visible. 

<iframe
  src="https://stopbyte.com/embed/png-to-webp"
  title="PNG to WebP Converter by StopByte"
  width="100%" height="640" style="border:1px solid #d9dde3;border-radius:12px"
  allow="clipboard-write" loading="lazy"></iframe>
<p>Calculator by <a href="https://stopbyte.com/tools/png-to-webp">StopByte PNG to WebP Converter</a></p>