OwnFile

Convert PNG to WebP

Free, unlimited PNG to WebP conversion that runs inside your browser. Your files never leave your device. Every conversion runs locally in your browser.

No upload · No sign-up · No file limit

or drop them here

Processed on your device · never uploaded · no limit

This converter needs JavaScript, because the conversion runs on your device rather than on a server.

This is the conversion to reach for when a PNG is slowing down a web page. WebP supports lossless compression too, so you can keep pixel-for-pixel fidelity and still cut the file size meaningfully — and unlike JPG, transparency survives intact. It is the single most effective change most sites can make to their image weight.

How to convert PNG to WebP

  1. Select your PNG files. Click "Choose PNG files" or drag them onto the box above. You can select as many as you like at once.
  2. Wait for the conversion. Each file is converted to WebP on your own device. Nothing is uploaded, so it finishes as fast as your hardware allows.
  3. Download the results. Download files individually, or take them all at once as a single ZIP archive.

PNG vs WebP

  PNG WebP
Full name Portable Network Graphics Web Picture format
Introduced 1996 2010
Compression Lossless Lossy or lossless
Transparency Yes Yes
Animation No Yes
Extensions .png .webp

About PNG files

PNG was created in 1996 as a patent-free replacement for GIF, and it became the standard for anything that needs a transparent background or pixel-perfect fidelity. Its compression is lossless, so a PNG is an exact reproduction of the original — no artefacts, no generational loss when re-saved. That precision is why it is the format of choice for logos, screenshots, icons, and UI assets.

Where they come from: Screenshots, logos, design exports, and app icons.

Drawbacks of PNG

  • Much larger files than JPG for photographs
  • No animation (outside the rarely-supported APNG extension)

Why convert to WebP?

WebP was released by Google in 2010 to cut image weight on the web, and it does: it typically produces files 25–35% smaller than an equivalent-quality JPG. It supports both lossy and lossless modes, full transparency, and animation, making it the one format that covers everything JPG, PNG, and GIF do individually. Its weakness is not technical but social — plenty of desktop software still refuses to open it.

  • Substantially smaller than JPG at matching quality
  • Handles transparency and animation
  • Supported by every current browser

Support: All modern browsers. Poor support outside the browser.

Common questions

Are my files uploaded to a server?

No. The conversion runs entirely inside your browser using your own device’s processor. Your PNG file is never transmitted, never stored, and never seen by us — you can disconnect from the internet after the page loads and it will still work.

Is there a file size or daily limit?

There is no daily limit and no account required. Because your device does the work rather than our server, we have no per-conversion cost to recover. The practical ceiling is your device's available memory — very large files on older phones may fail, in which case convert them in smaller batches.

Can I convert several PNG files at once?

Yes. Select or drop as many PNG files as you like and they are converted one after another, then offered as individual downloads or a single ZIP.

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