Why did the image download as WebP when the site showed a photo?

The site serves WebP because it loads faster. Your browser displays it as a normal photo, so nothing looks unusual until you save the file and hand it to other software.

Is a WebP file a virus?

No. It's an ordinary image format from Google, supported by every current browser. An unfamiliar extension is not a sign of anything harmful.

Can I email a WebP file?

You can attach it, but the recipient may not be able to open it — plenty of mail clients and phones won't preview it. Converting to JPG first avoids the problem.

Should I convert to JPG or PNG?

JPG for photographs and anything where file size matters. PNG if the image has transparency you need to keep, or contains sharp text and flat colour.

What about .avif files?

Same situation, newer format. AVIF compresses even better than WebP and is served by a growing number of sites, with the same compatibility gap outside the browser. Convert it the same way.

Will the converted file look worse?

Slightly, since the original was already lossy and JPG compresses it again. At high quality the difference is rarely visible. Converting to PNG avoids further loss but produces a much larger file.

WebP Files Won't Open? Why It Happens and How to Fix It

Updated August 30, 2026

You right-clicked an image, saved it, and now Word, Photoshop, or an upload form refuses to touch it. The file is almost certainly a WebP — or, increasingly, an AVIF. Neither is broken; they're just newer than the software you're trying to use.

The quick fix

Convert it. WebP to JPG or WebP to PNG will produce a file that opens anywhere — and if your file ends in .avif rather than .webp, AVIF to JPG does the same job. Pick JPG for photographs, PNG if the image has a transparent background you need to keep.

The rest of this explains why it happened, and how to stop collecting these files in the first place.

What WebP and AVIF actually are

Both are modern image formats built to make web pages load faster. WebP, from Google, typically produces files around 25–35% smaller than an equivalent JPG. AVIF is newer and compresses harder still. Sites serve them because smaller images mean faster pages, and every current browser displays them without complaint.

The catch is that a browser displaying a format is not the same as your computer supporting it. Save the image to your desktop and you leave the browser's world for software that may be years older — and that software often has no idea what a .webp file is.

Why the app you're using rejects it

Support outside the browser is patchy and version-dependent. Windows Photos handles WebP from Windows 10 version 1809 onward; macOS Preview from Big Sur (11). Older builds show nothing. Microsoft Office, many print services, government and job-application portals, and a good deal of desktop software simply don't list WebP or AVIF among accepted types.

Photoshop is the case that catches people out most. The usual advice — that only versions before CC 2015 need a plugin — doesn't match reality: current versions still trip over WebP in some setups, and on macOS the WebP plugin is routinely blocked by Gatekeeper with a warning that Apple cannot check it for malicious software. If Photoshop is refusing your file, converting it is faster than fighting the plugin.

Two things to check before you convert

Transparency. WebP and AVIF both support transparent backgrounds; JPG does not. Convert a transparent image to JPG and the see-through areas fill in, usually with white or black. If the image is a logo, sticker, or cutout, convert to PNG instead and the transparency survives intact.

Animation. WebP can hold an animation, much like a GIF. Converting one to a still format gives you a single frame, because JPG and PNG have no concept of motion. That's expected rather than a failure — but worth knowing before you wonder where the movement went.

Will converting lose quality?

A little, and it's unavoidable. WebP and AVIF files from websites are already lossy, so saving as JPG compresses an image that has been compressed once — a second generation. At a high quality setting the difference is rarely visible on screen, and converting to PNG avoids further loss entirely, at the cost of a considerably larger file.

One thing to expect: the JPG will usually be bigger than the WebP or AVIF it came from. That's the trade. You're spending file size to buy compatibility.

How to stop collecting these files

You can't control what format a website serves — that's the server's decision, made before the image reaches you. What you can do is convert after downloading, which takes seconds.

One trick worth knowing: some platforms let you request a different format by adding a parameter to the image URL, such as appending a format query to a Shopify image link. It works where the host supports it and nowhere else, so treat it as a bonus rather than a plan.

Common questions

Why did the image download as WebP when the site showed a photo?: The site serves WebP because it loads faster. Your browser displays it as a normal photo, so nothing looks unusual until you save the file and hand it to other software.
Is a WebP file a virus?: No. It's an ordinary image format from Google, supported by every current browser. An unfamiliar extension is not a sign of anything harmful.
Can I email a WebP file?: You can attach it, but the recipient may not be able to open it — plenty of mail clients and phones won't preview it. Converting to JPG first avoids the problem.
Should I convert to JPG or PNG?: JPG for photographs and anything where file size matters. PNG if the image has transparency you need to keep, or contains sharp text and flat colour.
What about .avif files?: Same situation, newer format. AVIF compresses even better than WebP and is served by a growing number of sites, with the same compatibility gap outside the browser. Convert it the same way.
Will the converted file look worse?: Slightly, since the original was already lossy and JPG compresses it again. At high quality the difference is rarely visible. Converting to PNG avoids further loss but produces a much larger file.