Install from the Chrome Web Store

Enable Hover Mode from the popup and move your cursor over any element on the page. A floating tooltip appears next to your cursor showing:

• Typography — font family, size, weight, line height, letter spacing
• Colours — text, background and border colours with hex codes and RGB values
• Spacing — padding, margin, and gap values
• Box — border radius, border, and box shadow

Click any element to lock the tooltip in place. Once locked:

• The tooltip becomes fully interactive
• Click any row to copy the value to your clipboard
• Highlight box turns pink to show the element is locked
• Click the ✕ Unlock button or press Esc to resume hovering

Click Scan Page to extract a complete design report:

• All fonts used per element type (h1, h2, p, a, button, etc.)
• Complete colour palette sorted by usage frequency
• All images (both <img> tags and CSS background images)
• Design tokens (padding, margin, border radius, shadow, etc.)

After scanning, hover over any colour swatch or font name in the popup panel — matching elements are highlighted directly on the page with a dashed outline.

• Copy JSON — full structured data to clipboard
• Download Report — exports a Markdown .md file with everything organised

Screenshots available on the Chrome Web Store listing

Install Design Inspector — free, no account required.

1. Download the latest release zip
2. Unzip the file
3. Open Chrome and go to chrome://extensions
4. Enable Developer Mode (toggle in the top-right corner)
5. Click Load Unpacked
6. Select the extension folder from the unzipped download
7. Pin the Design Inspector icon to your toolbar

design-inspector/
├── extension/ # Chrome extension source
│ ├── manifest.json # Extension manifest (MV3)
│ ├── background.js # Service worker — message relay
│ ├── inspector.js # Content script — hover tooltip and highlights
│ ├── scanner.js # Content script — full page scan
│ ├── popup.html # Extension popup UI
│ ├── popup.js # Popup logic
│ └── icons/
│ ├── icon16.png
│ ├── icon48.png
│ └── icon128.png
├── docs/
│ └── PRIVACY_POLICY.md # Privacy policy (hosted via GitHub Pages)
├── assets/ # Screenshots, promo images for store listing
├── .github/
│ └── ISSUE_TEMPLATE/ # Bug report and feature request templates
├── CHANGELOG.md # Version history
├── CONTRIBUTING.md # How to contribute
├── LICENSE # MIT License
└── README.md # This file

• Google Chrome (or any Chromium-based browser)
• No build tools required — this is vanilla JS, HTML, and CSS

1. Clone the repo:

   git clone https://github.com/JoeMighty/design-inspector.git
   cd design-inspector

2. Load the extension/ folder in Chrome via Developer Mode (see Manual Installation above)

3. Make changes to files in extension/

4. Go to chrome://extensions and click the refresh icon on the extension card

Contributions are welcome! Please read <CONTRIBUTING.md> before opening a pull request.

Design Inspector does not collect, store, or transmit any user data. All processing happens locally in your browser. See the full Privacy Policy.

MIT © JoeMighty