What Is a WebP File? Why Images Save as WebP and What to Do
· 5 min read · Vision
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A WebP file is an image compressed in a format Google released in 2010 to make web pages load faster. If you're wondering what a WebP file is doing on your computer, the usual answer is that you right-clicked and saved an image from a website — most large sites now deliver WebP instead of JPEG or PNG. The format is excellent for the web and increasingly well supported elsewhere, but older programs and some upload forms still reject it.
What is a WebP file under the hood?
WebP grew out of a video codec: its lossy mode compresses images the way VP8 compresses a single video frame, which is why it beats JPEG on file size at similar quality. A separate lossless mode was added later, giving it a second life as a PNG alternative.
One format therefore covers several jobs:
- Lossy compression — smaller than JPEG at comparable visual quality.
- Lossless compression — smaller than PNG for the same pixels.
- Transparency — an alpha channel in both modes, which JPEG never had.
- Animation — animated WebP replaces GIF with far smaller files.
What it doesn't have: HDR or more than 8 bits per channel. For that, the web is moving to AVIF — a newer format we'll compare below.
Browser support is no longer a question. Every current browser renders WebP; Safari, the last big holdout, joined in 2020.
Where you'll run into WebP files
- Saving images from websites — the classic case. The site serves you WebP, so "Save image as…" gives you WebP.
- Exports from design and optimization tools — image CDNs and site builders convert uploads to WebP automatically.
- Screenshots and stickers from some apps — messaging sticker packs commonly use WebP.
- Your own website's build pipeline — most static site generators and CMS plugins emit WebP versions of every image.
How to open WebP files
Windows 11
Recent Windows 11 builds open WebP directly in Photos and Paint. If Photos complains on an older Windows 10 machine, install the free WebP Image Extensions from the Microsoft Store. Any browser on the machine will also display the file — drag it into a browser tab.
macOS
Preview and Quick Look have opened WebP since macOS Big Sur. To convert a single file without extra tools, open it in Preview and use File → Export.
iPhone, iPad and Android
Phones handle WebP natively — Photos on iOS and Google Photos on Android both display it. The friction appears when you try to send a WebP into an app or form that expects JPEG.
Everything else
Any browser is a WebP viewer. For editing, recent Photoshop versions open WebP natively; GIMP and Affinity Photo do too. If your editor refuses the file, convert it to PNG first and keep working.
WebP vs JPG, PNG and AVIF
| WebP | JPG | PNG | AVIF | |
|---|---|---|---|---|
| Compression | Lossy + lossless | Lossy | Lossless | Lossy + lossless |
| Transparency | Yes | No | Yes | Yes |
| Animation | Yes | No | No | Yes |
| HDR / >8-bit | No | No | No (8/16-bit, no HDR) | Yes |
| Browser support | All modern | All | All | All modern |
| Best for | Web images today | Universal sharing | Graphics, screenshots, print-ready lossless | Smallest web images, HDR |
The short version: on the web WebP beats JPG and PNG at their own jobs, AVIF beats WebP at the cost of slower encoding, and JPG remains what you send when you don't know what software the other side runs.
When should you convert WebP (and to what)?
- An upload form or old program rejects it → WebP to JPG. Compatibility problem solved.
- You need transparency preserved or plan to edit further → WebP to PNG for a lossless copy.
- It's an animated WebP you want to share anywhere → WebP to GIF.
- A mixed folder of saved images → the WebP converter handles batches.
Going the other direction is just as common: if you run a website, converting your JPGs and PNGs to WebP is one of the cheapest page-speed wins available.
Common problems and fixes
"I saved an image and it's WebP, but I wanted JPG." The site only offers WebP; your browser saved what was served. Convert the file afterwards — there's no reliable browser setting that forces JPEG downloads.
An upload form says "JPG or PNG only." Convert before uploading. Many government, job-application and marketplace forms have allowlists written years ago.
Photoshop or an older editor won't open it. Update the editor, or convert to PNG and edit that. Older Photoshop versions predate native WebP support.
Windows shows no thumbnail. Thumbnails need the same codec support as opening the file — install the Store extension on older Windows, or convert.
The animated WebP opens as a single frame. Many viewers show only the first frame. Browsers play the full animation; converting to GIF makes it portable to everything else.
FAQ
Why do images save as WebP now? Because the website serves WebP to cut bandwidth and load time, and your browser saves exactly the file it received. It isn't a browser setting you can change. If you need another format, converting the saved file takes seconds.
Is WebP better than JPG? For the web, yes: smaller files at the same quality, plus transparency and animation. For handing files to other people, JPG still wins, because every program from the last 25 years opens it. Serve WebP, share JPG.
Does converting WebP to JPG lose quality? Both are lossy formats, so re-encoding costs a little fidelity — usually invisible at high quality settings. If the WebP was lossless (graphics, screenshots), convert to PNG instead and lose nothing.
Can I email a WebP file? Yes, it attaches like any file — the question is whether the recipient's software opens it. Recent systems do; corporate machines with older software often don't. JPG is the safe choice for unknown recipients.
How is WebP different from HEIC? Both compress better than JPEG, but they live in different worlds: WebP is the web delivery format every browser renders, while HEIC is Apple's camera storage format that browsers mostly don't. Converting HEIC to WebP is a sensible path for publishing iPhone photos online.