Bū tools
Ruler
A real-size grid to measure on the screen.
What it does
A real-size grid (centimeters or inches) to measure a small object laid on the screen.
How
- Calibrate once: a browser can’t know the real size of its pixels. Put a bank card (or any card that size: 85.6 × 54 mm) in the frame and adjust until the edges match. It stays on this device. On iPhone and iPad, the size is estimated from the model (within a few %).
- Show the grid: it fills the screen, stays on, and doesn’t react to touch, so you can lay the object down and move it. The × closes it (or Esc).
- The numbers count the squares from the top left corner: one square is 1 cm (or 1 inch), with millimeters when the screen is big enough.
Good to know
Be careful with the screen: put the object down gently. Zooming the page (or changing the display size in the settings) changes the scale: calibrate again.
Free, no account, nothing is sent: it runs in your browser, even offline.
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