WebP to PNG Chrome extension for downloads, clipboard copy, and Copy / Save as PNG workflows.
No converter website. No format check. No unnecessary interruption. Just keep working.
Install from Chrome Web Store · Test Lab · Privacy Policy · Issues & Support
I hate noticing WebP.
When I'm researching online, I often copy images directly into a PowerPoint slide. Normally that should take two seconds: find an image, copy it, paste it, keep working.
Then a WebP appears.
PowerPoint Web may respond with “Can't paste the picture”, breaking the flow. I have to save the image, convert it, find the converted file, insert it again, and then return to what I was actually trying to do.
Interestingly, the same image often works in Google Slides, which makes the interruption feel even more unnecessary.
NoWebP started from a simple goal:
make WebP something I don't have to think about.
It is not perfectly invisible yet. Chrome still owns some native image commands, and some edge cases intentionally fail safely rather than altering the image.
The goal stays simple:
no converter website, no format check, no unnecessary interruption. Just keep working.
Because NoWebP interacts directly with browser-native context menus, downloads, and the system clipboard, it cannot be tested within a static GitHub markdown page. Instead, a real, interactive test suite is published on GitHub Pages:
- Load NoWebP in Chrome (
chrome://extensions→ enable Developer mode → Load unpacked → chooseextension/). - Open the Test Lab in your browser.
- Try the samples: static WebP (lossy, lossless, alpha), real PNG, real JPEG, and animated WebP.
- Observe the result: each test card describes the exact user action and the on-page expected outcome.
| Image Format / Input | Automatic Behavior | Explicit Context Menu ("Copy image as PNG" / "Save image as PNG…") |
|---|---|---|
| Static WebP | Auto-downloads as .png; standalone tab ⌘C / Ctrl+C copies as PNG |
Converted to PNG (clipboard / single-dialog save) |
| Real PNG | Untouched | Raw PNG bytes passed through verbatim (no re-encode) |
| Real JPEG | Untouched | Converted to PNG (clipboard / single-dialog save) |
| Animated WebP | Untouched (preserves animation) | Untouched; shows top notice: "Animated WebP can't be copied or saved as a static PNG." |
| >80MP Large Images | Fail safe (untouched to protect memory) | Fail safe (untouched; toast notice shown) |
| Insecure (HTTP) Sources | Fail open (left untouched to Chrome) | Fail open (unaltered) |
- Chrome native "Copy Image": Chrome's built-in right-click
Copy Imageis part of the native browser shell and cannot be intercepted by extensions. To copy as PNG, use NoWebP's own "Copy image as PNG" entry. - Keyboard copy scope: Seamless keyboard copy (
⌘C/Ctrl+C→ PNG) is specifically supported when viewing a standalone static WebP in its own tab. - Animated WebP preservation: Animated WebP is intentionally never flattened into a single static frame.
- Memory safety guard: Images exceeding 80 Megapixels fail safe without conversion to protect browser stability.
Install directly from the official Chrome Web Store listing.
- Clone or download this repository.
- Open
chrome://extensionsin Chrome. - Enable Developer mode (top-right toggle).
- Click Load unpacked.
- Select this repository's
extension/folder (not the repository root).
NoWebP should now appear in your extensions list and is ready to use.
NoWebP operates entirely locally within your browser.
- No analytics, tracking, or telemetry
- No cloud conversion or remote code execution
- No persistent storage of image history or clipboard data
clipboardReadis never requested — NoWebP only writes PNG data upon your explicit or standalone copy action
Read the full Privacy Policy.
Thanks to tomkimberlin/Save-Image-As for useful prior art around context-menu image conversion during NoWebP's early research.
NoWebP was built independently and does not include code from that project.
This repository's Issues page is the support and contact channel for NoWebP. Please open an issue for bugs, questions, or compatibility reports.
No license has been assigned to this repository yet.