Chrome Extension

Run your scripts on any website.

Save JavaScript snippets with wildcard URL rules and run them on demand or automatically after page load — no server, no sign-in, just your code.

Add to Chrome — it's free Release Notes
Wildcard URL Matching Auto-Run on Load Run on Demand Edit Saved Scripts Works on Strict Sites No Sign-in
Site Script Launcher extension popup showing a script running on google.com with an alert dialog

Features

Everything you need to automate any page.

Write it once, run it anywhere your URL pattern matches — with full control over when scripts fire.

Per-site Script Rules

Each script gets its own URL pattern. Match a single path, an entire domain, or every site — as precise or as broad as you need.

Wildcard URL Matching

Use * to match anything: https://github.com/*, *://*.example.com/*, or just * for every page.

Run on Demand

Open the popup and click Run Enabled Scripts On Current Tab to instantly execute all matching scripts on the page you're viewing.

Auto-Run on Page Load

Enable auto-run and scripts fire automatically after each matching page loads — no clicks needed once configured.

Works on Strict Sites

Includes fallback execution logic for sites with strict Content Security Policies where standard script injection is blocked.

Stored Locally

All scripts are saved in chrome.storage.local — they stay in your browser, never sent to any server.

See it in action

Simple popup, powerful control.

Everything you need is one click away — add scripts, manage rules, and run code without leaving the page.

Add and manage scripts in seconds.

Give your script a name, enter a URL pattern, paste your JavaScript, and hit Add Script. It's saved instantly and ready to run.

  • Script name, URL pattern, and JavaScript code in one form
  • Edit or delete any saved script from the popup
  • Enable or disable individual scripts without deleting them
Site Script Launcher popup showing the Add Script form with name, URL pattern, and JavaScript fields

Run scripts on any page, instantly.

Navigate to a matching page, open the popup, and click run — your script executes immediately in the context of the current tab.

  • Scripts run in the active tab's page context
  • Auto-run fires scripts automatically after page load
  • Fallback logic handles Content Security Policy restrictions
Site Script Launcher running a script on google.com showing an alert dialog with 'Google was loaded'

How it works

Four steps to scripting any site.

1

Install the extension

Add Site Script Launcher to Chrome from the Web Store — free, no account needed.

2

Add a script

Open the popup, enter a name, set a URL pattern like https://github.com/*, and paste your JavaScript.

3

Visit a matching page

Navigate to any URL that matches your pattern. The extension detects the match automatically.

4

Run or auto-fire

Click Run Enabled Scripts from the popup, or enable auto-run to have scripts fire on every matching page load.

Privacy

Zero data collection. Full stop.

Site Script Launcher runs entirely in your browser. Your scripts and settings never leave your machine.

No ads

The extension is free and contains no advertising of any kind.

No tracking

No analytics, no telemetry, no usage data sent anywhere.

No servers

Your scripts stay in chrome.storage.local and go nowhere else.

No sign-in

Install and use immediately. No account, no email, no setup required.