Create valid manifest files with real-time validation and instant preview
Chrome Web Store will stop accepting Manifest V2 extensions. We recommend using Manifest V3 for new extensions.
Essential extension details
Maximum 45 characters
Use semantic versioning (e.g., 1.0.0)
Maximum 132 characters
Extension icon paths
Select required permissions
URLs your extension can access
Enter URL patterns (one per line)
Extension popup configuration
Background service worker configuration
Scripts injected into web pages
Real-time manifest output
{
"manifest_version": 3,
"name": "",
"version": "1.0.0",
"description": ""
}Manifest validation status
Download your manifest.json file