What is a WebP file, and how do I open it?

WebP is the format the web moved to without most people noticing. Google published it in 2010, browsers adopted it quietly, and by now a large share of the images you see on a page arrive as .webp, and the site has no reason to tell you.

Which is fine until you save one. Then it lands in your downloads folder as a file your photo editor shrugs at and the upload form refuses.

Why sites serve it

A WebP is typically 25 to 35% smaller than the JPEG of the same picture at the same visible quality, and it supports transparency, which JPEG never has. For anyone paying for bandwidth or chasing a page-speed score, that is an easy decision. Browsers all read it, and visitors never notice.

The trouble starts the moment a file leaves the browser, because the rest of your computer has not kept up with it.

Where it stops working

• Upload forms. Job applications, marketplaces, printers and government portals check the extension, and a good many accept JPG and PNG only.
• Older software. Windows added WebP support to Photos in 2018 and Explorer thumbnails later still; anything predating that shows a blank icon.
• Design tools with old versions installed, and a number of phone galleries.
• Anywhere a colleague opens it, which is usually the moment you discover the problem.

Three ways out

1. Convert it. WebP to JPG suits photographs and anything heading for a form; WebP to PNG keeps transparency, which matters for logos and anything with cut-out edges. Each runs in the browser, and nothing is uploaded.

2. Copy and paste instead of saving. Right-click the image in Chrome or Edge, choose Copy image, then paste directly into your editor or document. The browser hands over a PNG on the clipboard, which sidesteps the download entirely. Useful for one image, tedious for forty.

3. Screenshot it. A last resort that loses resolution and picks up whatever the page was doing around the image, but it takes two seconds and needs nothing installed.

The catch nobody mentions

WebP can hold an animation, the way a GIF does, and plenty of sites now use it that way. Converting an animated WebP to JPG or PNG gives you one frame, because those formats hold one picture. The file will look like it worked and quietly be a still.

If the image moved on the page, expect a single frame back.

Going the other way

If you run a site, the conversion is worth making deliberately: JPG to WebP and PNG to WebP shrink page weight noticeably, and every browser in current use will display the result. Keep the originals, since re-encoding a WebP back to JPEG later compounds the losses from both.

If this keeps happening

There is no setting that makes a website serve you a JPEG. The format is chosen at the server, and the file arrives as WebP regardless of your machine. Converting on the way in is the only durable answer, which is why the batch route exists.