Random String Generator: Create Secure Random Strings

Random strings are everywhere in software development — API keys, session tokens, test data, temporary passwords, file names, and database seeds. Our generator uses the Web Crypto API for cryptographically secure randomness.

Character Set Options

Standard Sets

• Uppercase (A-Z) — 26 characters
• Lowercase (a-z) — 26 characters
• Numbers (0-9) — 10 characters
• Symbols (!@#$%…) — 26 special characters

Hex Mode

Generates hexadecimal strings using only 0-9 and a-f. Useful for:

• Color codes (#ff6b35)
• Hash-like values
• Binary data representation
• Memory addresses

Custom Characters

Define your own character set for specific requirements. For example:

• ABC123 — only these 6 characters
• 01 — binary-like strings
• ACGT — DNA sequence simulation

How to Use Our Random String Generator

1. Set length — how many characters per string (1-1000)
2. Set count — how many strings to generate (1-100)
3. Choose character sets — uppercase, lowercase, numbers, symbols, hex, or custom
4. Click Generate to create new random strings
5. Copy All to get every generated string

Security: Web Crypto API

Our generator uses crypto.getRandomValues(), the browser’s built-in cryptographically secure random number generator. This is the same randomness source used by:

• TLS/SSL key generation
• Password managers
• Cryptographic libraries

It’s significantly more secure than Math.random(), which is predictable and should never be used for security-sensitive random values.

Common Use Cases

Use Case	Suggested Config
API key	32 chars, alphanumeric
Session token	64 chars, alphanumeric
Temporary password	16 chars, all character sets
Test data ID	8 chars, alphanumeric
Hex color code	6 chars, hex mode
File name suffix	8 chars, lowercase + numbers

Frequently Asked Questions

Are these strings truly random? Yes. They use cryptographic randomness from your browser’s Web Crypto API, which is suitable for security-sensitive applications.

Can the same string be generated twice? With sufficient length, the probability is negligible. A 32-character alphanumeric string has 62^32 possible values — more than 10^57 combinations.

Does this work offline? Yes. Everything runs in your browser with no server communication. Your generated strings are never transmitted anywhere.

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Try our free Random String Generator to create secure random strings instantly.