Generate random strings for tokens, IDs, and unique identifiers.
A random string generator creates unique, unpredictable character sequences for security tokens, API keys, session identifiers, database IDs, and other applications requiring random data. Whether you need alphanumeric strings, numeric-only sequences, or combinations with special characters, this tool provides customizable random string generation with full control over length and character types.
Random strings are sequences of characters selected randomly from a specified character set. Key characteristics of generated random strings include:
API Tokens & Keys: Generate unique API authentication tokens that change for each user session, preventing unauthorized access.
Session IDs: Web applications use random session identifiers to track individual user sessions securely.
Database Keys: Generate unique primary keys or identifiers for database records that don't follow sequential patterns.
Password Reset Tokens: Create temporary tokens sent via email for secure password reset processes.
Verification Codes: Generate codes for email verification, two-factor authentication, and account confirmation.
File Names: Create unique file names that avoid collisions when storing files.
Coupon Codes: Generate promotional codes with low collision probability for marketing campaigns.
Invite Codes: Create shareable invite tokens with specific length and character restrictions.
| Application | String Type | Length | Security Level |
|---|---|---|---|
| API Token | Alphanumeric | 32-64 chars | High |
| Session ID | Alphanumeric | 20-40 chars | High |
| Reset Token | Alphanumeric | 32-48 chars | Very High |
| 2FA Code | Numeric | 6-8 digits | Medium |
| Coupon Code | Uppercase + Numbers | 8-12 chars | Low-Medium |
| Invite Link | Alphanumeric | 16-24 chars | High |
Uppercase Only (A-Z): 26 possible characters. Useful for more readable tokens where lowercase isn't needed.
Lowercase Only (a-z): 26 possible characters. Creates readable strings but lower total combinations.
Numbers Only (0-9): 10 possible characters. Best for numeric IDs or codes, smaller entropy.
Uppercase + Lowercase (A-Za-z): 52 possible characters. Good balance of entropy and readability.
Alphanumeric (A-Za-z0-9): 62 possible characters. Recommended for most applications, high entropy.
With Symbols (!@#$%^&*): 90+ possible characters. Maximum entropy but less readable and URL-unfriendly.
For security-sensitive tokens (API keys, session IDs), use at least 32 characters. For less critical purposes, 12-16 characters usually suffices. The longer the string and more character types used, the lower collision risk.
Mathematically possible but extremely unlikely with sufficient length and proper randomness. A 32-character alphanumeric string has 62^32 possible combinations - more than the number of atoms in the universe. Collisions become concern only with millions of strings.
Symbols increase entropy significantly, but they can cause problems in URLs, databases, and some systems. For maximum compatibility, stick with alphanumeric (A-Za-z0-9). For critical security applications with no compatibility concerns, symbols provide additional security.
Random string generators create arbitrary sequences, while password generators create human-memorable combinations. Passwords need pronounceability and remembrance; tokens need pure randomness and can be any length.