Random Hex String Generator (256-bit)
Bulk generate cryptographically secure API keys, salts, tokens, and decode precise millisecond timestamps from UUIDv7.
🔒 Processed entirely in your browser — nothing you enter here is ever uploaded.
The result appears on this page after you run the tool. Nothing you enter is uploaded.
Result
About this tool
This page opens the secrets generator with the 256-bit hex salt type already selected — choose how many strings you need and copy them out.
Each value is 64 hexadecimal characters encoding 256 bits from the browser's CSPRNG — the usual shape for password salts, HMAC secrets, session keys and signing secrets, in an alphabet that is safe to paste into any config or shell.
The full tool also generates UUID v4, UUID v7 and Base64 tokens, exports to .env, JSON and YAML, and decodes UUID v7 timestamps — all locally in your browser, with no server involved.
Example. A requested API key is filled from crypto.getRandomValues, and a UUIDv7 is decoded to the millisecond timestamp stored in its first bits.
Limit. Millisecond extraction applies to UUIDv7 only; a version-4 UUID has no embedded time to decode.