FreeNo uploadNo sign-upBatch
PNG to WebP Converter
Cut image weight for faster pages while keeping transparency. No upload, no limits.
Drop PNG files here
batch and mixed formats welcome
- Private by design. Converted inside your browser.
- Instant. No upload queue, no waiting.
- Unlimited. Convert hundreds of files, download as ZIP.
How to convert PNG to WebP
Add your PNG files
Drop them on the converter, click Choose files or paste from the clipboard. You can add as many as you like.
Adjust the settings
Set the WebP quality. 80–90% is a good balance for most web graphics; check the size shown next to each file.
Download your WebP files
Each file converts automatically. Save files one by one or all at once as a ZIP.
Why convert PNG to WebP?
Large PNGs are a common reason pages load slowly and score poorly in PageSpeed Insights. WebP keeps transparency like PNG but stores images far more efficiently.
Converting site images from PNG to WebP is one of the simplest speed improvements you can make, and WebP is supported by every current browser.
PNG vs WebP
| PNGPortable Network Graphics | WebPWebP image | |
|---|---|---|
| Type | Raster graphic | Raster image for the web |
| Compression | Lossless | Lossy or lossless |
| Transparency | Full alpha channel | Supported |
| Animation | APNG only, limited support | Supported |
| Support | Every browser and editor | All modern browsers; patchy in older desktop apps |
| Best for | Screenshots, logos, UI, images with text or transparency | Website images where page speed matters |
Frequently asked questions
How much smaller is WebP than PNG?
Typically 25–80% smaller, depending on the image. Photos saved as PNG shrink the most; tiny icons shrink the least.
Does WebP keep transparency?
Yes. WebP supports a full alpha channel, so transparent backgrounds stay transparent.
Is WebP supported by all browsers?
Yes. Chrome, Edge, Firefox, Safari and Opera all display WebP. The remaining gaps are mostly in older desktop software, not browsers.
Will WebP improve my PageSpeed score?
Lighter images reduce page weight and often improve Largest Contentful Paint. The exact effect depends on the rest of your page.
Are my files uploaded to a server?
No. formatmath converts files with code that runs inside your browser. Your files are never uploaded, stored or seen by us.
Is it free?
Yes. There is no watermark and no daily limit. An account is optional and only keeps a history of your conversions.