Help
Online Protractor Help and Support
Find the most useful support topics in one place, check the recommended browser setup, and review quick answers before you send a support request.
Support topicsSystem notesQuick answers
Browse Help Topics
Browse Help Topics
Use these shortcuts when you already know the kind of answer you need. The links below jump you directly to the most relevant setup, workflow, or policy page.
System Requirements
System Requirements
Online Protractor does not need a heavy setup, but a modern browser and a little screen space make the alignment process much easier.
Browser Support
- Chrome: Current desktop and mobile versions
- Firefox: Current desktop releases
- Safari: Recent macOS and iOS versions
- Edge: Current Chromium-based releases
Device Support
- Desktop: Best for detailed alignment and export review
- Tablet: Good for touch interaction and quick checks
- Mobile: Useful for quick reads, especially with the camera
Performance
- Memory: A modern browser with enough free memory for large images
- Connection: Only needed to load the site itself
- Camera: Optional browser permission when live capture is needed
Frequently Asked Questions
Frequently Asked Questions
These are the questions that usually come up first. If the answer is not here, the Contact page is the best next step.
Is Online Protractor free to use?
Yes. The core browser tool is available without sign-up, so you can upload, measure, and export without creating an account.
Do my uploaded images stay private?
The measurement workflow is designed to stay in your browser session. Review the Privacy Policy if you need a fuller explanation of data handling.
Can I use the tool on mobile?
Yes. The layout responds on mobile and tablet, although a larger screen is still easier when the angle sits on a tiny or crowded image.
Why does the reading change when I move the center slightly?
Because the vertex defines the angle. Even a small shift changes the direction of both sides, so place the center first and adjust the pointer second.
Where do I go if export or camera access fails?
Start with browser permissions and refresh the page. If the issue continues, open the Contact page and describe the browser, device, and step where it happened.