Screen Ruler

What is Screen Ruler?

Screen Ruler is a Chrome extension for inspecting and measuring web pages. It helps designers and developers check element dimensions, spacing, selectors, computed CSS, colors, screenshots, accessibility contrast issues, and SEO-related metadata directly in the browser.

The extension can be activated from its toolbar icon, the right-click context menu, or a keyboard shortcut. Once active, it overlays inspection tools on the page so users can hover or click elements to inspect layout and page metadata without leaving the site.

Key Features

• Measure element size and spacing: view pixel dimensions, margins, paddings, and distances between elements.
• Inspect element identity: reveal tag names, IDs, and class names on hover or selection.
• View computed CSS and copy it: inspect the current element’s computed styles in the side panel and copy the CSS to the clipboard.
• Use rulers and a color picker: place horizontal and vertical guides for precise measurement and sample colors from anywhere on the page.
• Capture selected content: take cropped screenshots of chosen elements with a keyboard shortcut.
• Review page quality signals: detect WCAG contrast issues, common SEO problems, meta tags, and social preview data for Facebook, X, and LinkedIn.

How to Use Screen Ruler

After installing the extension, turn it on from the toolbar icon, the context menu, or the shortcut Alt/Option + Shift + R. Hover over elements to inspect their size and metadata, or click an element to select it and compare it with nearby content.

From the side panel, you can view computed CSS and copy it, use parent/child selection shortcuts, inspect rulers and colors, and access tools for screenshots, meta tags, and page analysis. The extension also supports custom shortcuts through Chrome’s extensions settings.

Use Cases

• Checking spacing and alignment on a landing page or interface mockup before handing work to engineering.
• Identifying the exact CSS class, ID, and computed styles for an element during frontend debugging.
• Sampling a color from a design reference or live page to match a visual system.
• Capturing a cropped screenshot of a single component for documentation or bug reports.
• Reviewing a page for missing SEO metadata, multiple H1s, or contrast issues before publishing.

FAQ

Does Screen Ruler work on any website? The listing says it works on any web page.

How is the extension activated? It can be opened from the extension icon, the right-click context menu, or the keyboard shortcut Alt/Option + Shift + R.

Can I copy CSS from an element? Yes. The side panel includes a computed CSS view and a “Copy CSS” button.

Does it include more advanced tools beyond inspection? Yes. The listing also mentions screenshots, color picking, accessibility checks, SEO analysis, and social preview inspection. Some additional capabilities are part of the PRO tier.

Alternatives

• Browser developer tools: useful for direct inspection and debugging, especially when working inside Chrome’s built-in panels rather than an overlay extension.
• Other browser inspection extensions: similar tools may focus more narrowly on measurements, rulers, CSS inspection, or color picking.
• Design handoff and QA tools: these are better suited when teams need broader visual review workflows instead of in-browser element inspection.
• Accessibility and SEO auditing tools: these may provide deeper issue reporting if the main goal is audit workflows rather than live page inspection.