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Lossless · Canvas API

WebP → PNG

Drop WebP images below. Conversion happens entirely on your device — no upload, no server, no tracking. Preserves transparency, zero quality loss.

By Keishin · Published · Updated

network out: 0 bytes

$ tips

  • Drag multiple WebP files at once — they convert one after another so your browser doesn't run out of memory.
  • Transparency is preserved. If your WebP has an alpha channel, the PNG will too.
  • To verify nothing is being uploaded, open DevTools → Network tab before dropping a file. The tab stays empty.
  • The page is fully offline-capable. Save it as a bookmark, disconnect from wifi, and it still converts.

How offline WebP to PNG conversion works

This page uses your browser's built-in Canvas and Image APIs — no external libraries, no WebAssembly, no server upload. When you drop a WebP file, the browser decodes it natively (all modern browsers support WebP decoding), draws it to an invisible canvas, and exports it as PNG. At no point does the file leave your device.

Why offline conversion matters

Most "free WebP converter" websites work by uploading your images to their servers. That's invisible to you — you drop a file, it converts, you download. But behind the scenes, your image lived on someone else's machine. This matters if your WebPs contain:

  • Screenshots with personal or financial information
  • Design mockups under NDA
  • Product photos for an unreleased launch
  • Medical or legal document scans
  • Anything you wouldn't email to a stranger

With offline conversion, the file is processed entirely inside the privacy sandbox of your browser tab. There is no upload endpoint on our side — the server serves the static HTML/CSS, and your browser does the rest.

How to verify it's really offline

You don't have to trust us. Verify it yourself:

  1. Open your browser's DevTools (right-click → Inspect, or F12).
  2. Switch to the Network tab and clear it.
  3. Drop a WebP file onto the converter above.
  4. Watch the Network tab — it stays empty during conversion. No XHR, no fetch, no WebSocket. Nothing.

Alternatively: load this page, then turn off your wifi or unplug your ethernet. The converter still works because everything it needs is already in your browser.

WebP vs PNG — what's the difference?

WebP is Google's modern image format (released 2010). It supports both lossy and lossless compression, transparency, and animation — and produces files 25–35% smaller than equivalent PNGs. It's widely supported in browsers, but many desktop applications, image editors, and content management systems still don't accept it.

PNG (Portable Network Graphics) is the lossless standard from 1996. It's supported by literally everything — every operating system, every browser, every image editor, every app. Files are larger than WebP, but compatibility is universal.

This converter lets you have both: keep your originals as WebP for efficient storage and web use, convert to PNG on demand when you need universal compatibility.

Does WebP to PNG increase file size?

Yes — usually. WebP's compression advantage means a typical 100 KB WebP will become a 130–400 KB PNG depending on image complexity and whether the original WebP was lossy or lossless. This is the tradeoff: you gain universal compatibility at the cost of larger files. If file size matters more than compatibility, keep the WebP.

Frequently asked questions

Is the WebP to PNG conversion really offline?

Yes. The converter is a static web page that uses your browser's built-in Canvas and Image APIs. Once the page loads, all conversion happens locally on your CPU — no WASM, no server roundtrip, no upload. Disconnect your wifi after the page loads and it still works.

Will I lose image quality converting WebP to PNG?

No. PNG is a lossless format, and our converter preserves every pixel from the original WebP. If your original WebP was created losslessly, the PNG output will be pixel-identical. For lossy WebPs, the PNG will faithfully reproduce the decoded image with no additional compression artifacts.

What's the difference between WebP and PNG?

WebP is Google's modern image format designed for the web — it produces files 25–35% smaller than PNG at similar quality. PNG is a lossless format from the 1990s, universally supported by every application and operating system. Convert WebP to PNG when you need maximum compatibility.

Does the converter preserve transparency?

Yes. If your WebP image has transparency (alpha channel), the resulting PNG will also have transparency. The converter preserves the full RGBA channels through the canvas pipeline.

Is there a file size limit?

No enforced limit, but your browser has practical memory constraints — typically 1–2 GB on a desktop. For typical web-sized WebP images (under 1 MB each), you can convert hundreds in one session without issues.

Does this work on mobile (iPhone, Android)?

Yes. The converter works in Safari on iPhone/iPad and Chrome/Firefox on Android. On mobile you may want to convert files in smaller batches since RAM is more limited than on desktop.

Are my images private when I use this converter?

Completely. Your files never leave your device. The conversion happens inside your browser tab using the Canvas API — there is no server upload step. We only collect anonymous, cookieless pageview analytics via Plausible. No file names, contents, or metadata are ever transmitted. See our privacy page for the full disclosure.

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