Convert PNG to WebP
Convert PNG images to WebP for dramatically smaller files that still support transparency — the best of both formats for web use. Runs entirely in your browser.
- Private — no upload
- No signup
- Free & unlimited
To convert PNG to WebP online, drop in your PNG and download it as WebP. Transparency is preserved and the file is typically 30–70% smaller, with nothing uploaded to a server.
How to convert a PNG to WebP
- Drop your PNG. Add a PNG image, or click to browse.
- Choose quality. Optionally resize or set a quality level — WebP output supports both.
- Download WebP. Download the smaller WebP file with transparency intact.
The conversion that costs you nothing
Most format conversions are a trade. This one rarely is: WebP keeps the transparency that made you choose PNG, and delivers a fraction of the file size.
Typical savings run from 30% on simple flat graphics to 70% or more on PNGs containing photographic content. For a site heavy with logos, icons, screenshots and product cut-outs, converting the lot is one of the largest page-speed wins available for the effort involved.
What you can expect to save
| PNG content | Typical saving as WebP |
|---|---|
| Photograph saved as PNG | 70–90% |
| Screenshot of an interface | 50–75% |
| Logo or icon with alpha | 30–60% |
| Flat two-colour graphic | 10–30% |
Lossy by default, and that is fine
WebP output here is lossy, which is what produces the large savings. For photographs and screenshots the difference is invisible at sensible quality settings.
For a logo made of two flat colours with hard edges, push the quality slider high — flat colour is exactly where lossy compression artefacts are easiest to spot, and a high-quality WebP is still comfortably smaller than the PNG.
Need to go back? WebP to PNG restores the format, though not the detail already discarded — so keep your PNG originals.
Why use ResizeMate
Private
Images are processed in your browser and never uploaded to a server.
Fast
No upload/download round-trip — results are instant on your device.
Free
No signup, no watermark, no limits.
Frequently asked questions
- Does WebP support transparency like PNG?
- Yes — WebP supports a full alpha channel, so transparent backgrounds survive the conversion.
- How much smaller will the WebP be?
- Typically 30–70% smaller, and more for PNGs holding photographic content.
- Is WebP safe to use on my website?
- Yes — every current browser supports it, and has for years.
- Are my images uploaded?
- No — conversion runs entirely in your browser.