Tutorial
Measure angles in photos
Three clicks for a reading; longer rays and zoom for a tighter ±.
1. Load the photo
Choose a file, paste a screenshot, or try an example from the sidebar. The image stays in your browser — check the network panel and you will see no upload.
2. Place vertex → ray → ray
With the Angle tool active, click the corner first, then a point along each edge. A hint at the bottom of the canvas walks you through the steps until your first measurement is complete.
3. Refine and read ±
Drag handles or focus one and nudge with arrow keys. The ± figure next to each reading is calculated from your ray lengths and zoom — it shrinks when you zoom in or draw longer rays.