Convert PNG to WebP
Cut PNG file sizes substantially while keeping transparency — the standard move for faster web pages.
Drop your PNG files here
or click to browse · paste with Ctrl+V · files never leave your device
Nothing queued yet. Add as many files as you like — everything runs on your own device.
Nothing is uploaded
Conversion runs in your browser. Your files never touch a server, so there is no copy of them to leak.
No sign-up, no watermark
No account, no email, no daily limit, and nothing stamped across your image.
Batch and folders
Drop a hundred files at once and download the results as a single ZIP.
Works offline
Once this page has loaded you can disconnect entirely and it still works.
Converting PNG to WebP is a page-speed exercise. WebP holds full transparency exactly as PNG does, but compresses far better, so it is a straight replacement for PNG on the web with no visual trade-off in the cases that matter. Images are usually the largest thing a page downloads, so this shows up directly in Largest Contentful Paint and in Core Web Vitals.
Every browser still in meaningful use decodes WebP — Chrome, Edge, Firefox, Safari and every mobile browser. The remaining compatibility gap is outside the browser: desktop software, office applications and upload forms often still refuse it, which is why WebP belongs on your website and not in an email attachment.
The conversion runs in your browser, so you can process an entire image folder at once and download it as a ZIP without uploading anything.
How to convert PNG to WebP
- Add your PNG files. Drag them onto the box above, click to browse, or paste an image straight from your clipboard. You can add as many at once as you like.
- Adjust the settings if you need to. The defaults suit most images. Raise the quality slider if the image contains text or flat colour.
- Download the WebP file. Each file gets its own download button as soon as it finishes, and you can pull the whole batch down as a single ZIP.
What changes when you convert PNG to WebP
Every format conversion involves trade-offs, and vague tools hide them. Here is exactly what happens to your image in this particular conversion.
- Transparency is preserved: both PNG and WebP carry a full alpha channel.
- PNG is lossless and WebP is lossy, so this conversion discards some detail permanently. At the default quality the difference is invisible on photographs, but flat colour, screenshots and text will show faint halos — keep the quality high for those.
Lossy or lossless WebP?
The quality slider decides. At maximum quality the encoder writes lossless WebP, which reproduces the PNG exactly and is typically 20 to 30 percent smaller — the safe choice for logos, icons, diagrams and screenshots, where the saving is real and nothing is risked.
Below that, WebP is lossy, and for photographs that is where the large wins are: 60 to 80 percent smaller than the PNG with no visible difference at the default setting. Use it for photographic content and leave graphics with text at maximum.
The usual mistake is running flat-colour graphics through lossy WebP at a low setting, which produces the same halos around text that JPG does. If the image contains type, push the slider up.
Serving WebP without breaking anything
The safe pattern is to keep the PNG and offer WebP alongside it, letting the browser choose. In HTML that means a picture element with a WebP source and the PNG as the img fallback; on most hosting and CDN platforms it can be automatic.
Keep your PNG originals regardless. WebP is a delivery format — the version you serve — and the PNG remains your master copy for future edits and exports.
What happens to the file size
Measured, not estimated: two 1200 x 800 pixels references — a photograph and a flat-colour graphic — put through this converter.
| Reference image | As PNG | As WebP | Change |
|---|---|---|---|
| Photograph | 1.67 MB | 163 KB | -90% |
| Graphic with text | 40 KB | 8 KB | -79% |
Yours will differ: size depends more on what is in the picture than on the formats involved.
About PNG (Portable Network Graphics)
PNG is the lossless format of choice for screenshots, logos and any image that needs a transparent background.
Where you probably got it: Screenshots, logos, design exports, and graphics with transparency.
Strengths
- Completely lossless — pixels survive unlimited re-saves untouched
- Full 8-bit alpha transparency, including soft edges and drop shadows
- Perfect for text, screenshots, line art and flat colour
Limitations
- Much larger than JPG or WebP for photographs
- No animation (APNG exists but is patchily supported)
- No quality dial — you cannot trade detail for size
About WebP
WebP is Google’s web image format, offering roughly 25–35% smaller files than JPG at comparable quality.
Support: Excellent in browsers, poor outside them. This mismatch is why "save image" so often lands you a file nothing else will open.
Strengths
- Noticeably smaller than JPG and PNG at matching quality
- Does both lossy and lossless, and supports transparency in either mode
- Supported by every current browser
Limitations
- Older desktop software, printers and photo kiosks often reject it
- Many websites, job portals and government forms still refuse .webp uploads
- Windows Photo Viewer and older Office versions cannot open it
Is it safe to convert PNG online?
Here, yes — and you can check rather than trust. Open your browser’s developer tools, switch to the Network tab and convert a PNG file: no request carrying your image is made. Disconnect from the internet after this page has loaded and the converter still works, which would be impossible if a server were doing the conversion.
That is worth verifying wherever you convert, because most online converters do upload, and PNG files are so often screenshots of statements, invoices and internal dashboards, which people rarely think of as sensitive until they are on a stranger’s server. Once a file is on somebody else’s server you are relying on a privacy policy rather than on anything you can observe. We wrote up how to tell a safe converter from a risky one in more detail.
Frequently asked questions
Does PNG to WebP keep transparency?
Yes, fully. WebP stores an alpha channel in both its lossy and lossless modes, so transparent and semi-transparent areas come through exactly as they were. This is what makes it a genuine replacement for PNG rather than a compromise.
How much smaller will the WebP be?
Lossless WebP is typically 20 to 30 percent smaller than the PNG. Lossy WebP on a photograph is commonly 60 to 80 percent smaller with no visible difference. The measured comparison above shows both a photograph and a graphic put through this site’s own converter.
Is it safe to use WebP on my website?
Yes. Every current browser decodes it, including Safari on iOS and macOS. The pattern most sites use is a picture element offering WebP first with a PNG or JPG fallback, which costs nothing and covers anything unusual.
How do I convert PNG to WebP?
Drag your PNG file onto the box above, or click it to browse. The conversion starts immediately in your browser and the WebP download appears within a second or two for most images. You can drop in a whole folder of files at once and download them together as a ZIP.
Are my PNG files uploaded to a server?
No. The conversion happens locally in your browser, so your files are never transmitted anywhere — the tool even works with the network disconnected once the page has loaded. That is also why there is no file size or file count limit: nothing costs us anything per conversion. The practical ceiling is your own device's memory, which on a phone means very large images may fail.
Will converting PNG to WebP reduce the quality?
Slightly, by design. WebP is a lossy format, so it approximates the image to save space. At the default quality setting the loss is invisible on photographs; on screenshots and text you may see faint halos, so raise the quality slider or choose PNG instead.
What is the difference between PNG and WebP?
PNG is the lossless format of choice for screenshots, logos and any image that needs a transparent background. WebP is Google’s web image format, offering roughly 25–35% smaller files than JPG at comparable quality. In practice the choice comes down to compatibility: universal across browsers, operating systems and design software. Meanwhile excellent in browsers, poor outside them. This mismatch is why "save image" so often lands you a file nothing else will open.