RulerOnline icon
RulerOnline icon

RulerOnline

A free online ruler that calibrates to your screen's exact pixel density using a bank card, so on-screen measurements match real life.

Measure online

Cost / License

  • Free
  • Proprietary

Platforms

  • Online
Calibrate as per your screen
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Features

Properties

  1.  Lightweight

Features

  1.  Dark Mode
  2.  No registration required
  3.  Unit converter

 Tags

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RulerOnline information

RulerOnline was added to AlternativeTo by webtools6 on and this page was last updated .
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What is RulerOnline?

RulerOnline is a free, no-login online ruler that measures real-world size directly on your screen. Most online rulers guess at your screen's pixel density and get the scale wrong — RulerOnline fixes this with a 10-second calibration step using a standard bank card (85.6mm wide under ISO/IEC 7810, the same size worldwide) or a sheet of A4 paper as a reference. Once calibrated, it remembers your screen for future visits.

Measure in millimeters, centimeters, or inches, with a dual-caliper "span" mode for measuring the distance between two points, full keyboard shortcut support, a measurement history log, and a printable ruler for offline use. Works in any modern browser, no installation or account required.