Random Token & Secret Key Generator
Generate cryptographically secure random tokens in 5 formats - hex strings, Base64-encoded bytes, UUID v4 identifiers, Stripe-style API keys (sk-xxx), and numeric OTP codes. Each token includes entropy analysis and a security level rating. All randomness comes from your browser's crypto.getRandomValues() API - nothing is sent to any server. Copy tokens with one click, no signup required.
crypto.getRandomValues().Token Format
crypto.getRandomValues() API - a cryptographically secure pseudo-random number generator (CSPRNG). No tokens are logged, stored, or transmitted to any server. Generated tokens are displayed on-screen for you to copy and then discarded from memory when you close or refresh the page (your format preferences are persisted, but the actual tokens are not saved).Why Use Our Token Generator?
5 Token Formats
Generate hex strings (32-128 chars), Base64-encoded random bytes (16-64 bytes), RFC 4122 version 4 UUIDs, Stripe-style API keys (sk-xxx), and numeric OTP codes (4-10 digits). Each format is optimised for its specific use case with appropriate length options.
Cryptographically Secure Randomness
All tokens are generated using the browser's crypto.getRandomValues() API - a cryptographically secure pseudo-random number generator (CSPRNG). The same API used by browsers for encryption, TLS, and secure key generation.
Real-Time Security Analysis
Every generated token includes entropy bits calculation, a security level rating (Very Weak through Very Strong), and an entropy bar showing where the token sits on the scale from 0 to 256+ bits. Know immediately if your token meets cryptographic requirements.
One-Click Copy & Format Info
Copy any token to your clipboard with one click. Each format includes contextual notes explaining when to use it - hex for encryption keys, Base64 for tokens, UUIDs for database IDs, API keys for service auth, and OTPs for one-time codes.
Common Use Cases for Token Generator
API Key & Secret Generation
Developers generate API keys and secrets for web services, microservices, and third-party integrations. The API key format (sk-xxx) follows Stripe-like conventions, while Base64 and hex formats work for OAuth secrets, signing keys, and application tokens.
Database IDs & Identifiers
Developers generate UUID v4 identifiers for database primary keys, distributed system IDs, and event correlation. UUIDs are globally unique without coordination - perfect for distributed databases, event sourcing, and message queue identifiers.
Session Tokens & CSRF Tokens
Web applications use hex or Base64 tokens for session identifiers, CSRF protection, and state nonces. The 128+ bit entropy ensures these tokens are practically impossible to guess or brute force within any reasonable timeframe.
One-Time Passwords (OTP)
Implement two-factor authentication flows with cryptographically secure OTP codes. Generate 6 or 8-digit codes using crypto.getRandomValues() for reliable randomness - suitable for email verification, SMS OTPs, and authenticator app fallbacks.
Encryption Key Generation
Security engineers generate hex-encoded encryption keys for AES, HMAC, and other cryptographic algorithms. A 64-character hex string (256 bits) is suitable for AES-256, while 128-character hex strings (512 bits) provide extra margin for future-proofing.
Password Reset & Invite Tokens
Applications generate secure random tokens for password reset links, email verification, and team invite URLs. The high entropy prevents token guessing attacks, and the one-click copy makes it easy to paste tokens into emails or database records.
Understanding the Token Generator
What is a Random Token Generator?
A random token generator creates cryptographically secure random strings used for authentication, authorisation, encryption, and identification. Our token generatorsupports 5 formats - hex, Base64, UUID v4, API keys, and OTP codes - each suited to specific use cases. All randomness comes from the browser's crypto.getRandomValues() API, the same source used for TLS encryption and secure web communications.
How Our Token Generator Works
- Choose a Format: Select from 5 token formats using the format cards at the top. Each format has a description explaining what it is and when to use it. Your selection is saved to localStorage for future visits.
- Select Length: Choose from predefined length options for your selected format. Each option shows the number of characters and, for hex and Base64, the equivalent bit strength. Longer tokens provide more entropy and security.
- Generate & Review: Click "Generate" to create a new token using
crypto.getRandomValues(). The token is displayed in a monospace font with word-break for long strings. The security analysis panel shows entropy bits, security level, and an entropy bar chart. - Copy & Use: Click "Copy to Clipboard" to copy the token. Tokens are never saved - they are generated on demand and displayed only on screen. Refresh the page and a new token is generated automatically.
Understanding Entropy & Security
- Entropy (bits): A measure of how unpredictable a token is. Higher entropy means a token is harder to guess or brute force. Each bit doubles the number of possible values. 128 bits is the minimum recommended for cryptographic security; 256 bits is considered future-proof.
- Hex (Base 16): Uses characters 0-9 and a-f. Each character encodes 4 bits of entropy. A 64-character hex string = 256 bits. Commonly used for encryption keys, session IDs, and visual hashes.
- Base64 (URL-safe): Encodes binary data using A-Z, a-z, 0-9, - and _. More compact than hex - a 32-byte random token gives 256 bits of entropy in ~43 characters. Used for API secrets, JWTs, and compact tokens.
- UUID v4: 128-bit identifier with 6 bits reserved for version/variant, giving 122 bits of random entropy. Universally unique without central coordination. Best for database IDs and distributed systems, not cryptographic secrets.
- API Keys (sk-xxx): Alphanumeric tokens with a recognisable prefix. The random portion uses 62 characters (A-Z, a-z, 0-9). A 48-character key provides approximately 234 bits of entropy from the random portion.
- OTP Codes: Numeric codes using digits 0-9. A 6-digit code provides 20 bits of entropy (~1 million possibilities). Suitable for time-limited verification but not for long-term secrets.
Privacy & Security
This token generator runs entirely in your browser. All random values are generated using crypto.getRandomValues(), a cryptographically secure PRNG that is part of the Web Crypto API. No tokens are ever sent to any server, logged, stored in databases, or tracked. Your format and length preferences are saved to localStorage, but the generated tokens themselves are not persisted - they exist only in memory and are replaced when you generate a new token or close the page.
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Frequently Asked Questions About Token Generator
A random token generator creates cryptographically secure random strings used for authentication, API keys, encryption keys, database IDs, and one-time passwords. Our tool supports 5 formats - hex, Base64, UUID v4, API keys (sk-xxx), and numeric OTP codes - all generated using the browser's crypto.getRandomValues() API.
Yes. crypto.getRandomValues() is a cryptographically secure pseudo-random number generator (CSPRNG) provided by all modern browsers. It is the same source of randomness used for TLS encryption, HTTPS, and secure web communications. It is suitable for generating encryption keys, API secrets, and security tokens.
For encryption keys and session tokens, use Hex or Base64 with at least 256 bits of entropy (64 hex chars or 32 Base64 bytes). For database IDs and distributed identifiers, use UUID v4. For API keys, use the API key format with sk- prefix. For time-limited verification codes, use OTP (6-8 digits).
128 bits is the minimum recommended for cryptographic security. 256 bits is considered future-proof and should withstand brute-force attacks for the foreseeable future. UUID v4 provides 122 bits - sufficient for uniqueness but not recommended for security tokens. OTP codes (20 bits) are only suitable with rate limiting and expiration.
No. Generated tokens are displayed on-screen for you to copy and then exist only in browser memory. They are not saved to localStorage, not logged, not transmitted to any server, and not stored in any database. Your format and length preferences are saved to localStorage for convenience.
Yes. The token generator works entirely offline once the page is loaded. crypto.getRandomValues() is a browser API that does not require network access. All processing is done locally with no server requests.
UUID v4 contains 122 bits of random entropy with a fixed structure (version/variant bits). It is designed for uniqueness across distributed systems without coordination. Random hex or Base64 tokens can have higher entropy (256+ bits) and are better for security purposes like API secrets and encryption keys.
Yes. The Base64 output uses URL-safe characters: - replaces +, _ replaces /, and padding = characters are removed. This means the tokens can be used directly in URLs, query parameters, and HTTP headers without additional encoding.