Free online converter
PNG to WebP Converter
PNG is the format you reach for when edges have to stay crisp and backgrounds have to stay clear — logos, icons, screenshots, UI exports, product cutouts. The catch is weight. Because PNG stores every pixel losslessly, one full-color screenshot or detailed illustration can balloon to several megabytes, and a page full of them quietly drags your load times down.
WebP keeps the same alpha transparency, just packed far tighter. Drop a PNG here and LightBox re-encodes it server-side with FFmpeg, holding onto every transparent pixel while cutting the file to a fraction of its original size. Want it even lighter? Pull the quality slider down until the size feels right.
No account, no install, no watermark. Pick your PNG, adjust quality or resize if you like, and download the WebP in seconds. Files are processed on our server and auto-deleted within about an hour.
Why convert with LightBox
Transparency comes through intact
WebP carries the same alpha channel as PNG, so logos, icons and cutouts keep their clean edges and see-through background. No white box behind the subject, no halo around it, no flattening — exactly what you exported, only lighter.
Dial in the quality you want
Keep the quality slider high to stay close to your original PNG at a smaller size, or pull it down for images that load far faster. You decide where quality meets size instead of accepting a fixed preset.
Free, private, nothing to sign up for
The converter is anonymous by default and never stamps a watermark. Your PNG is processed server-side and deleted within about an hour. Upgrade to Pro if you want a permanent library or batch conversion for a whole folder of assets.
Free forever. Pro when you need more.
Everything on this page stays free. Pro adds this — once, no subscription, ever:
- 1 GB uploads, no daily limit
- Batch convert + saved presets
- Permanent library, priority processing