BrowserTools

PNG to WebP Converter

Shrink PNGs into modern WebP files

By Guga — BrowserTools maintainer, Tbilisi, Georgia Updated 2026-09-21
Free Private No uploads
What is PNG to WebP Converter?

WebP carries an alpha channel, so unlike JPG this conversion needs no background fill and no flattening — cut-out logos, screenshots with rounded corners, and PNGs with soft alpha edges come out intact. The encoder is the one your browser already ships, and its behaviour is well understood: below about 80% you start trading visible detail for bytes, around 85% most people cannot tell the difference, and at 100% you are close to but not guaranteed a bit-exact match, since Chrome's WebP path stays lossy. Where WebP genuinely wins is photographs and any PNG carrying real alpha; flat pixel art and line art often compress better as PNG, so check the reported sizes before you swap a site's assets wholesale.

Convert PNG images to WebP — typically 25–35% smaller at the same visual quality. Adjustable quality slider and batch conversion, all processed locally in your browser.

Private PNG to WebP Converter In Your Browser

PNG to WebP Converter is processed locally with client-side JavaScript. Your files never touch a server, and there is no queue to wait in.

Step-by-Step

How to use PNG to WebP Converter

1

Drop one or many PNG files into the Convert to WebP area; the picker allows .png only.

2

Set Output Quality, which spans 10–100% and opens at 85%.

3

Skim the WebP thumbnails — transparency is preserved, so no background fill control is offered here.

4

Hit Download, or take every result at once through Download all (N) as ZIP.

Key Capabilities
  • Accepts 50 PNG files per run, with a picker filtered to image/png and .png
  • Alpha transparency is carried through untouched — no background fill is applied
  • Quality is adjustable from 10% to 100% in 5% steps, starting at 85%
  • Original and converted byte sizes are printed on every result card, and multi-file runs download as a ZIP
Common Use Cases
  • A front-end developer replacing hero-image PNGs after noticing each one costs a few hundred kilobytes on mobile data.
  • A designer exporting a logo with a feathered alpha edge that must stay feathered after optimisation.
  • A marketer compressing a set of product shots for a landing page that already serves modern image formats.
Clear Answers

Frequently Asked Questions

Will WebP always be smaller than my PNG?
For photographs and images with alpha, usually by a wide margin. For flat illustrations, UI screenshots, and pixel art, PNG's DEFLATE can beat WebP — the tool shows both byte counts so you can check rather than assume.
What happens if I set quality to 100%?
The encode is very close to the original but is not mathematically lossless in Chrome; WebP's lossless mode is a separate mode this tool does not expose. If you need a guaranteed bit-exact copy, keep the PNG.
Is there a background colour option like the JPG converter has?
No, and it is deliberate. WebP supports transparency, so filling the background would destroy information rather than preserve it. The control is only shown for output formats that cannot represent an alpha channel.
Can I check that nothing is uploaded?
Yes, and it takes ten seconds. Open DevTools, go to the Network tab, and drop a PNG. No request appears, because the file is decoded and re-encoded entirely inside the tab.