Measure Angle
Find angles between lines
Runs in your browser. Files never leave your device.
How to use Measure Angle
- Open an image.
- Choose three points or two lines, then place the points on the image.
- Drag points to fine-tune, and copy the angles or download the annotated image.
About this tool
Measure any angle in a photo or drawing. Click three points (the end of one arm, the corner, the end of the other arm), or draw two separate lines to get the angle between them, even when they don’t meet in the picture.
- Works on your device. Nothing is uploaded.
- Free, with no sign-up and no watermark.
- No limits on file count or size beyond what your device can handle.
Questions and answers
Does it show reflex and supplementary angles?
Yes. For three points you also see the reflex angle (360° minus the angle), and for two lines the supplementary angle (180° minus the angle).
Is the angle affected by perspective?
Yes. Angles are measured in the flat picture, so photograph the subject straight on for a true value.
Is Measure Angle free?
Yes. Every tool on ImgImage is free to use, with no sign-up, no watermark and no limit on how many files you process.
Are my files uploaded anywhere?
No. Your files are processed by your own browser and never leave your device. Nothing you open here is sent to a server.
Does it work on my phone?
Yes. It works in any modern browser on phones, tablets and computers. Large files are processed faster on a computer.