Screen Ruler - Measure The Web

Screen Ruler is the perfect companion for web developers and designers wanting to validate the implementation of their websites. Once activated, it allows you to view the sizes, margins, paddings, tag names, IDs, and classes simply by hovering over any web content. You can also select an item to measure distances to others.

Usage

- Toggle the extension by clicking the icon, selecting from the right-click context menu, or using the shortcut `Alt/Option + Shift + R`.
- Hover over items on web pages to display their sizes, margins, paddings, tag names, IDs, and classes.
- Select an item by clicking on it directly; this will turn the highlight red. To deselect, click again, press Escape or select a different item.
- To select the parent, use `Alt/Option + Up`. Use `Alt/Option + Down` to reverse your selection.
- View the computed CSS of the currently selected item in the side panel. Click the "Copy CSS" button to copy the computed CSS to your clipboard.

Features

- Measure the pixel size of any element.
- Measure the pixel distance between any two elements.
- HTML tag names, class names and IDs.
- Parent/child selection shortcuts.
- Responsive selections resize with your browser window.
- Access from the context menu.
- Computed CSS inspect.
- Copy CSS to clipboard.
- Page rulers for precise measurements (horizontal and vertical guides with crosshair).
- Color picker tool to sample and copy colors from anywhere on the page.
- Element Screenshots: Capture cropped screenshots of selected items using `Ctrl/Cmd + Shift + S`.
- Works on any web page.
- Customize keyboard shortcuts by visiting `chrome://extensions/shortcuts`.

Screen Ruler PRO
A PRO tier is also available which unlocks additional features.

- Floating Inspector: See detailed properties when you hover, including position, size, rendered font, colors and more.
- Accessibility Issues: Automatically detect and highlight WCAG contrast failures in your selection with actionable recommendations.
- Responsive Mode: Test your designs across different device viewports with an interactive device emulator and custom dimensions.
- Box Shadow Visualization: Interactive breakdown of multi-layer box shadows with an exploded view.
- Animation Analysis: Visualize CSS animation timing curves and copy animation properties.
- Asset Extraction: Extract and download images, SVGs, and vector assets.
- Color Extraction: Extract and copy color palettes from selected content with hex, RGB, and HSL values.
- Layout Grid Overlay: Overlay a customizable layout grid for perfect design alignment.
- CSS Selector Search: Find and highlight items using CSS selectors.
- Typography: Analyze and extract all typography styles used in your selection.
- X-Ray Mode: Reveal the underlying structure of the page by outlining all content.

PRO requires a one-off payment for lifetime access.

Made For

- Developers: Spot layout issues or identify alignment problems. Whether you're tweaking margins and paddings, or just making sure everything lines up correctly, this tool becomes an indispensable addition to your development toolkit.
- Designers: Ensure your designs have been implemented with pixel-perfect accuracy. It acts as a bridge between design and development, allowing you to check if every component aligns exactly as you intended.

Installation

- Designed specifically for stability in Google Chrome 116+.
- Installable on any Chromium browser; however, for the best experience, make sure your browser supports all the required APIs (like Side Panel and Offscreen). If there are any issues with installation, update your browser to the latest version and try again.