What this tool does
API Key Generator creates demo tokens in hex, base64, UUID-style, or custom alphabets with prefixes and export formats.
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🔑 API Key Generator
Generate demo/test API keys and tokens with format, length, prefix, and export controls. Not for production secrets storage.
Why it is useful
It helps developers fill mock configs, docs, and test harnesses without inventing fake keys by hand.
How it works
The browser draws random bytes (or a seeded PRNG for reproducible fixtures) and encodes them in the selected format.
Security tip
Leave seed blank for cryptographic randomness. Never treat generated demo keys as production credentials storage.
Privacy note
Generation happens locally in your browser.
Important limitation
Do not use this as a vault. Rotate real production keys through your provider console.
Quick answers
Is seeded output secure?
No. Seeds are for tests only. Empty seed uses crypto.getRandomValues when available.
What does entropy mean here?
An estimate of bits based on alphabet size and length — approximate, not a formal security proof.
Common Use Cases
Fill a .env example file
Generate sk_ prefixed keys and export as .env lines for docs samples.
Mock Authorization headers
Use header output format for HTTP client fixtures.
Create reproducible fixtures
Set a seed so test suites get the same fake tokens every run.