Runs in your browser — nothing is uploaded
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How to use Online Protractor
Drag the two arm handles, use the sliders for exact values, or open a photo to measure an angle in a picture. Photos stay on your device.
- Drag the round handles at the end of each arm, or set exact directions with the sliders.
- Read the angle between the arms, its supplement and the reflex angle.
- Tap “Open photo” to place the protractor over a picture; move the centre by dragging the middle handle.
Questions
Is the on-screen protractor accurate?
Angles are calculated exactly from the arm positions, so accuracy depends on how precisely you place the arms. Zoom in on the photo for fine work.
Is my photo uploaded?
No. The photo is opened directly in your browser and never leaves your device.