Experience the most versatile online protractor designed for precision. Whether you need to measure angles on an uploaded image, use your webcam for real-world objects, or overlay a transparent scale on your screen, our tool provides 100% accuracy. No downloads or installations required, just a fast, browser-based digital protractor for engineers, designers, and students needing instant degree measurements.
Tune the reference layer, active protractor, grid, snap behavior, and export-ready styling without leaving the canvas.
Helpful shortcuts: Ctrl/Cmd+Z, Ctrl/Cmd+Shift+Z, R, +, -, Delete, Space, G.
Keep a photo, screenshot, or diagram behind the protractor while everything stays local in the browser.
No image loaded yet. Drop a file onto the stage or paste directly from the clipboard.
Switch between multiple overlays, then adjust only the one you want to refine.
Use the visual scaffold when the photo edge is noisy or hard to align by eye.
Show either square lines or a dot matrix behind the tool.
Point 1 becomes the base ray, and each next point is measured against the ray created immediately before it.
Pick a ready-made palette or override the visible strokes on the selected protractor.
An Online Protractor Tool is a digital angle reader that sits right on top of your image, screenshot, or live camera view. Instead of estimating by eye, you place the vertex, rotate or resize the protractor, and let the canvas create measurement points that stay tied to the image.
If you want a deeper workflow breakdown, the Tutorial page and the photo measurement guide both show how to turn a rough visual angle into something you can trust a little more.
This version of the Online Protractor Tool focuses on the features people use most often: loading a background fast, lining the angle up clearly, auto-recording points, and exporting the result without switching tools halfway through the job.
Start measuring the moment a screenshot or photo is ready. The workspace accepts file uploads, drag-and-drop, and pasted clipboard images.
Need a live reference? Turn on the camera feed, place the vertex, and read the angle without leaving the browser tab.
Switch snapping on when you want stable 1, 5, 10, 15, or 30 degree movements instead of small shaky adjustments.
Click to create a point and the Measurements panel updates right away. You can focus, drag, or delete each point without a separate save action.
Download a PNG or PDF for visual proof, or export the measurement list as CSV, Excel, or JSON when you need something reusable.
The canvas and panels stack cleanly on small screens, so the Online Protractor Tool still feels workable on tablets and mobile devices.
The easiest workflow is simple: add your image, line it up, place the protractor, add the measurement points, and export the result when everything looks clean.
Upload a photo or diagram, drag in a file, or paste an image from your clipboard to start the workspace.
Rotate or flip the image, adjust brightness and contrast, and use the grid to line up the edge you want to measure.
Choose 180° or 360°, move the center into place, adjust the radius, and refine the rotation with Snap or quick angles.
Click to create points, drag the red rays until they match the target edges, and review the point cards in the Measurements panel.
Download PNG or PDF for sharing, or export CSV, Excel, or JSON if you want to reuse the measurement data elsewhere.
You stay on the image instead of guessing from memory. That is especially helpful when you need to discuss a corner with someone else.
The tool loads right in the browser, so you can move from screenshot to reading to export without a separate install.
Students can check geometry homework, while engineers and makers can validate slopes, joints, and layout details.
A screenshot plus auto-recorded points is easier to review than a message that only says the angle looked close enough.
Measurements happen in your own browser session, so you can work quickly on internal screenshots or rough site photos.
Yes. Upload a photo or paste a screenshot, move the vertex to the corner point, and drag the point or edge until the ray matches the second side of the angle.
Yes. Switch to 360-degree mode whenever the angle wraps past a semicircle and you need the larger reading.
Yes. The homepage tool includes a camera option so you can align the protractor directly on a live feed when browser permissions allow it.
You can download a PNG or PDF workspace export and send the measurement list out as CSV, Excel, or JSON.
Place the center carefully, use the grid when edges are hard to judge, and switch snap steps on if you want more repeatable point placement.
Check the Features page for workflow details, the Tutorial page for guided steps, and the Help page when you need support or system notes.