Chrome Screenshot Pro

A step-by-step guide and code reference for building a Chrome extension that captures full-page screenshots. Single HTML file with complete Manifest v3 implementation — background scripts, content scripts, and popup UI.

Table of Contents

• What's Inside
• Topics Covered
• Usage
• Who Is This For
• License

What's Inside

index.html — an interactive reference guide containing:

• Complete Manifest v3 configuration with required permissions
• Background script — tab capture API, screenshot triggering
• Content script — full-page scrolling screenshot logic (captures beyond viewport)
• Popup UI — extension popup design with capture controls
• Code samples ready to copy into your own extension project

Topics Covered

Topic	Description
Manifest v3 setup	Permissions, service workers, content script registration
Tab capture	chrome.tabs.captureVisibleTab() API usage
Scroll capture	Automated page scrolling + stitching for full-page screenshots
Popup design	HTML/CSS for the extension popup interface
File download	Saving captured images as PNG files

Usage

# Open the guide in your browser
open index.html

Browse through the sections, copy the code snippets, and use them as a starting point for your own Chrome screenshot extension.

Who Is This For

• Developers building their first Chrome extension
• Anyone who needs full-page screenshot functionality in a browser extension
• Reference for Manifest v3 migration (from v2)

License

MIT