Convert PNG to WebP
This tool converts a PNG image to WebP, preserving transparency and original dimensions while typically producing a smaller file. Processing happens in your browser — your image is never uploaded anywhere.
- Free
- Unlimited
- No Uploads
- Works Offline
Why use a PNG to WebP converter?
WebP typically produces meaningfully smaller files than PNG at the same visual quality, which speeds up page loads. It's supported by all current browsers, so there's rarely a reason to keep serving PNG unless a specific tool still requires it.
How it works
Step 1
Upload
Pick a PNG file — or any JPEG or WebP. It stays on your device.
Step 2
Convert
The tool re-encodes it as WebP, keeping any transparency.
Step 3
Download
Save the WebP straight from your browser.
Frequently asked questions
- Does this upload my image to a server?
- No. The conversion happens locally in your browser using your device's own processing power. The image never leaves your computer or phone.
- What formats can I upload?
- You can upload PNG, JPEG, or WebP files — the output is always WebP.
- Does converting to WebP preserve transparency?
- Yes. WebP supports transparency, so any transparent areas in your PNG carry over to the output.
- How much smaller will the WebP be?
- It depends on the image, but WebP is typically 25–35% smaller than an equivalent PNG at the same visual quality.
- Does this resize my image?
- No. This tool only changes the file format — width and height stay exactly as they were in the original.
- Is PublishFit free to use?
- Yes. There's no account, no subscription, and no limit on how many images you can convert — PublishFit is free to use, on this tool and every other one on the site.
- Can I use this on my phone?
- Yes. PublishFit works in any modern mobile browser — tap to upload a photo from your camera roll or files, and the WebP downloads straight to your phone.
Where this helps
- Shrinking website graphics without losing transparency
- Speeding up page load for image-heavy sites
- Preparing logos and icons for the web
- Reducing email attachment size
Your files never leave your device
Every tool on this site processes images entirely in your browser. Nothing is uploaded, nothing is stored on our servers.Read our full privacy commitment.