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Works 100% offline — test in Airplane Mode

100% client-side Web Crypto & JavaScript. Zero server round-trips.

NETWORK ON

DEVELOPER UTILITY

License Key Generator & Validator

Generate cryptographic serial numbers and license keys (e.g. `XXXX-XXXX-XXXX-XXXX`) with Luhn/SHA-256 checksum validation for macOS and SaaS apps.

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License Key Generator & Validator

100% IN-BROWSER

PREFIX:

BATCH SIZE:

Generated Serial Keys (With Tamper Checksum) Format: XXXX-XXXX-XXXX-XXXX

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Capture JSON, cURL, API secrets, and tokens with instant regex search, on-device AI classification, and 1-click smart transforms.

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📊 Mac Clipboard Benchmark (2026) 🏆 7 Best Mac Clipboard Managers 🔒 State of Clipboard Privacy ⚡ Developer Clipboard Guide

Frequently Asked Questions

Is this tool free with no limits?

Yes. Unlike competitors that cap rows or require subscriptions, this tool runs entirely in your browser with unlimited operations and zero paywalls.

Is my input data uploaded to any remote server?

No. All computations execute locally in JavaScript memory. Verify by running in Airplane Mode.