Screen Ruler
Measure anything on your screen with a calibrated on-screen ruler — set the reference width once, then measure freely.
Screen ruler
Viewport rulers in px / cm / in with a red cursor crosshair. Click Measure, then click two points on the page to get horizontal, vertical and diagonal distances (converted to the selected unit). Press Esc to cancel.
- cm/in assume the standard 96 CSS pixels-per-inch.
- The vertical ruler starts below the 40px corner block and labels true viewport-Y values.
- Rulers measure the browser viewport — scrollbars and OS scaling affect on-screen size.
About Screen Ruler
Measure anything on your screen with a calibrated on-screen ruler — set the reference width once, then measure freely.
Screen Ruler is designed to be open-and-go: everything runs in the page with clear on-screen controls, and results appear immediately without any setup.
How to Use Screen Ruler
- Open the tool and allow any permission it asks for (only if needed).
- Follow the on-screen controls to run the task.
- Review the result shown live on the page.
- Copy, save or share the output as required.
Key Features
- No installation or account — just open the page and use it.
- Clear, guided interface that works on desktop and mobile.
- Everything runs locally in your browser for privacy and speed.
Frequently Asked Questions
Do I need to install anything for Screen Ruler?
No. Screen Ruler runs entirely in your web browser — there is nothing to download, install or configure.
Is Screen Ruler free to use?
Yes. Screen Ruler is completely free with unlimited use — no account, download or payment required.
Is my data uploaded to a server?
No. Screen Ruler runs entirely in your browser. Your inputs are never sent to our servers or stored anywhere.
Does Screen Ruler work on mobile?
Yes. The interface is fully responsive and works in any modern browser on Android, iPhone, tablets and desktops.
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