LightBox

Free online converter

PNG to WebP Converter

Drop a video or image
Choose file

MP4, MOV, WebM, GIF, JPG, PNG, WebP, HEIC, ZIP

Up to 100 MB free · 1 GB with Pro

HEIC, animated WebP input, PNG sequences and frame sequence export require Pro.

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.

Convert common formats free. Lifetime Pro adds more capacity and permanent hosting, with no subscription.

LimitFreeLifetime Pro
File size100 MB1 GB
Per day4 filesUnlimited
Files kept1 hourForever
Batch1 file20 files
QueueStandardPriority
was $54now $27

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Frequently asked questions

Yes. WebP supports a full alpha channel, so any transparency in your PNG is preserved exactly. Your logo, icon or cutout stays see-through — no white background fills in behind it and no rough edges appear around the subject.

Only if you want it to. Keep the quality slider high and the WebP stays visually true to your PNG at a smaller size. If you'd rather trade a little detail for an even lighter file, pull the quality down with the slider until it looks right to you.

Usually far smaller — especially for screenshots, illustrations and anything rich in color, which is exactly where PNG tends to be heaviest. Lower quality settings shrink it the most, but even at high quality WebP typically lands well under the size of the original PNG.

Yes. Every current major browser — Chrome, Firefox, Safari and Edge — renders WebP, which is why it has become a default choice for web images. For the rare very old browser, you can keep the original PNG around as a fallback.

A single PNG converts instantly with no account needed. If you have a folder of icons or screenshots to process, a one-time Pro upgrade unlocks batch conversion and a permanent library of your finished WebP files.

More conversions

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