Web Tools
Nonce Generator
Generate cryptographic nonces in hex, Base64, and Base64URL formats. Configurable byte length (1-128), batch generation up to 50, collision probability estimation, and presets for CSP nonces, CSRF tokens, OAuth state, session IDs, and AES keys. Runs entirely in your browser — your data never leaves your machine.
nonce token crypto security csp csrf random generator
Published June 1, 2026
All interactive tools run entirely in your browser. Your data never leaves your device.
How It Works
Generate random nonces using pseudo-random byte generation, then encode in your preferred format. Estimate collision probability using the Birthday problem approximation. All processing runs entirely client-side.
Features
- 3 output formats: hex, Base64 (standard), Base64URL (URL-safe, no padding)
- Configurable length: 1-128 bytes (8-1024 bits of entropy)
- Batch generation: generate up to 50 nonces at once
- 7 presets: CSP nonce, CSRF token, OAuth state, session ID, API key, AES-128 IV, AES-256 key
- Uppercase hex: optional uppercase output for hex format
- Custom prefix: add a prefix string to generated nonces
- Collision estimation: Birthday problem probability for 1M generations
- Copy support: copy individual nonces or all at once
- Private: runs entirely in the browser — no data transmitted
Use Cases
- Content Security Policy: generate nonces for inline script/style tags
- CSRF protection: create anti-forgery tokens
- OAuth flows: generate state parameters
- Session management: create session identifiers
- Encryption: generate initialization vectors and keys
- API security: create API keys and bearer tokens