Random String Generator – Create Alphanumeric Strings, IDs & Tokens

Generate random alphanumeric strings for unique IDs, tokens, passwords, test data, and more. Customize length and character sets to create exactly what you need. Secure, fast, and entirely browser-based.

What Is a Random String Generator?

A random string generator creates sequences of characters—letters, numbers, and symbols—with no predictable pattern. These random strings serve as identifiers, tokens, passwords, and test data across software development, security, and everyday use cases.

Features

How to Use This Tool

Step 1: Set Length

Choose your desired string length. Common lengths:

• 8-12 characters for simple IDs
• 16-24 characters for tokens
• 32+ characters for high-security uses

Step 2: Select Character Types

Choose which characters to include:

• Uppercase Letters (A-Z)
• Lowercase Letters (a-z)
• Numbers (0-9)
• Special Symbols (!@#$%^&* etc.)

Step 3: Generate & Copy

Click Generate, then copy your random string. Generate again for a new result.

Common Use Cases

Software Development

• Database primary keys — Unique identifiers for records
• API keys — Access tokens for services
• Session tokens — User session identifiers
• CSRF tokens — Security tokens for forms
• Temporary file names — Unique naming

Testing & QA

• Test data generation — Random input for testing
• Mock IDs — Placeholder identifiers
• Load testing — Unique values for stress tests
• Data masking — Replace sensitive data

Security

• Password generation — Strong random passwords
• Secret keys — Encryption key generation
• Salt values — Password hashing salts
• Verification codes — Email/SMS verification

System Administration

• Temporary passwords — Initial user credentials
• Backup file naming — Unique backup identifiers
• Log correlation IDs — Track requests across systems
• Configuration secrets — Environment variables

Character Set Reference

Alphanumeric only: 62 possible characters per position

String Strength by Length

Frequently Asked Questions

How random are the strings?

We use the Web Crypto API (crypto.getRandomValues) when available, providing cryptographically secure random numbers suitable for security-sensitive applications.

Can I generate UUIDs?

For standard UUIDs, use our UUID Generator. This tool creates custom-format strings.

Is there a length limit?

Practical limits depend on your browser, but strings up to several thousand characters work fine. Most use cases need under 128 characters.

Are special characters included by default?

You can toggle special characters on or off. For passwords, include them; for IDs, often alphanumeric is preferred.

Can I exclude similar characters?

Some tools exclude ambiguous characters (0/O, 1/l/I). If needed, generate and manually replace problematic characters.

Are generated strings saved anywhere?

No. All generation happens locally in your browser. We never see or store your generated strings.

Best Practices

For IDs and Tokens

• Length: 16-32 characters
• Characters: Alphanumeric only (URL-safe)
• Format: Single case preferred (uppercase or lowercase)

For Passwords

• Length: 16+ characters
• Characters: All types (letters, numbers, symbols)
• Mixing: Maximum character variety

For Database Keys

• Length: Match your schema requirements
• Characters: Alphanumeric (database-safe)
• Consider: UUID format for standard compatibility

Pro Tips

1. Use longer than you think — Entropy matters; 16+ chars is safer
2. Match existing patterns — Match string format to system requirements
3. Avoid ambiguous chars — Remove 0/O/1/l/I if humans will type it
4. Document your format — Record character sets used for consistency
5. Rotate security strings — Regenerate API keys and tokens periodically

Related Tools

Explore more generator utilities:

• UUID Generator — Standard UUID format
• Password Generator — Strong passwords
• Random Number Generator — Random numbers
• Random Word Generator — Random words
• Hash Generator — MD5, SHA hashes

Generate random strings above with custom length and character sets. Perfect for IDs, tokens, passwords, and test data.