LicenseCrawler is a free and portable product key finder for Windows. It scans your system registry to retrieve license keys, serial numbers, and product registration codes for installed software. This is especially useful when reinstalling Windows, migrating to a new PC, or recovering lost software activation details.
Recover Product Keys with LicenseCrawler

What is LicenseCrawler?
A small utility that scans the Windows Registry for software license information and product serial keys. Many software programs store activation keys and registration data in the registry. This tool makes it easy to locate and export those keys—especially for software you've lost the packaging or digital license for.
Key Features
- Recover Software Keys: Automatically find product keys and serial numbers for software such as Windows, Microsoft Office, Nero, antivirus programs, and more.
- Scans the Windows Registry: Searches known registry locations to uncover embedded license data and activation info.
- Broad Compatibility: Supports a wide range of applications and Windows versions.
- Export Results: Save the retrieved license keys to a plain text file or other formats for safe backup and easy reference.
- Portable and Lightweight: No installation required. Just download and run—ideal for use from a USB stick or recovery toolkit.
- Freeware: Available at no cost for personal use (check the author’s site for full licensing terms).
Specifications
- Extracted Size: 76 KB
- Operating System: Compatible with Windows (XP, Vista, 7, 8, 10, 11)
- Developer: Martin Klinzmann
- Project Website: Project Page
- License: Freeware (personal use)
- Download: Download LicenseCrawler
When to Use LicenseCrawler
- Before Reinstalling Windows: Ensure you retain all software keys to avoid reactivation issues.
- System Migration: Moving to a new PC? Use it to gather your activation keys before transferring.
- Data Recovery: Recover lost product keys for old software no longer supported or without digital receipts.
- IT and Tech Support: Add this tool to your troubleshooting toolkit for quick audits and license recovery.
Final Thoughts on this Serial Key Finder
LicenseCrawler is an essential serial number lookup tool for Windows users who need to locate and back up software licenses and product keys. It's fast, portable, free, and doesn't require installation. Whether you're a casual user needing your Windows key or a technician assisting clients, this utility can save time, hassle, and the cost of re-purchasing software you already own.