A responsive on-screen ruler for measuring elements and images. Switch between pixels, centimetres, millimetres and inches, and calibrate for your display.
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A responsive on-screen ruler for measuring elements and images. Switch between pixels, centimetres, millimetres and inches, and calibrate for your display.
Whether you're a professional or just need a quick result, the Online Screen Ruler gives you a fast, reliable everyday tool that works instantly in your browser. There's no software to install and nothing to sign up for — open the page, get your result and move on. Because everything runs on your own device, it's private by default and available whenever you need it.
The Online Screen Ruler is part of TechToolsCenter — a free, privacy-first collection of 126+ online tools. Everything runs 100% in your browser, so your data stays private and results are instant.
Input
Output
Formats
It loads instantly and works entirely in your browser — no sign-up, no install.
Add your input or start the task. Everything updates live as you go.
Adjust the settings to fit what you need. Your work is saved locally in your browser.
Save or share the result. Nothing is ever uploaded to a server.
Tips
Common mistakes
Best practices
Input
Form fields — e.g. screen ruler
Output
Result, generated instantly in your browser
Pixels, centimetres, millimetres and inches, with a calibration option for accuracy.
It's free, private and works instantly — no sign-up required.
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