Whispercode

Random String Generator
secure strings in seconds

Free online random string generator for developers. Create API keys, passwords, tokens, UUIDs with cryptographic security. Customizable and instant.

Quick Presets

1-256 characters

1-100 strings

Try: “generate 50 passwords”, “I need a hex token”, “20 API keys 40 characters”

Generated Strings

Configure your settings and click Generate to create secure random strings

What is a Random String Generator?

A random string generator creates cryptographically secure random strings for API keys, passwords, tokens, and session IDs. Our generator uses crypto.getRandomValues() for true randomness suitable for production use.

Unlike standard Math.random(), which is predictable, cryptographic random generation provides unpredictable strings that are safe for security-sensitive applications. Generate single strings or bulk quantities with customizable length, character sets, and export formats.

How It Works

Generate secure strings in 3 steps

1

Choose Configuration

Select length, character types, and presets for your strings

2

Generate Strings

Click generate to create secure random strings instantly

3

Copy or Export

Copy individual strings or download in bulk as TXT, JSON, CSV

Features

Powerful string generation features

Cryptographically Secure

Uses crypto.getRandomValues() for true random generation suitable for production

Multiple Presets

Quick presets for API keys, passwords, tokens, session IDs, PINs, and Base64

Bulk Generation

Generate up to 100 strings at once for testing, seeding, or mass creation

Custom Character Sets

Define your own character sets or use built-in lowercase, uppercase, numbers, symbols

Entropy Calculator

Real-time entropy calculation shows strength from weak to very strong

Export Options

Export as TXT, JSON, CSV, JavaScript, Python, or SQL INSERT statements

Use Cases

When to use a random string generator?

API Keys

Generate secure API keys for backend services, webhooks, and integrations. 32+ character alphanumeric strings are standard.

Testing Data

Create unique identifiers for automated tests, mock user IDs, session tokens, and test database records.

Passwords

Generate strong, random passwords for new accounts. Use 16+ characters with mixed case, numbers, and symbols.

Session IDs

Create unpredictable session identifiers for web applications. Essential for security and preventing session hijacking.

Tokens

Generate reset tokens, verification codes, invitation links, and one-time access codes.

Database Seeds

Create unique string IDs for database seeding scripts, test fixtures, and development environments.

Common Questions

Common questions about random string generators

How secure are the generated strings?

Our generator uses crypto.getRandomValues(), a cryptographically secure random number generator built into modern browsers. This provides true randomness suitable for production use in API keys, passwords, and security tokens. Unlike Math.random(), which is predictable, cryptographic generation ensures strings cannot be guessed even if an attacker knows previous outputs.

What's the difference between API Key and Password presets?

API Keys typically use alphanumeric characters (uppercase, lowercase, numbers) without special symbols, making them easier to copy-paste in URLs and configuration files. Passwords include special symbols (!@#$%^&*) for maximum security and typically use 16+ characters. Both provide strong entropy, but passwords prioritize maximum security while API keys prioritize compatibility and ease of use.

Should I exclude similar characters?

Enable the “exclude similar” option when strings will be manually typed or read aloud. This removes easily confused characters like 0/O (zero/letter O), 1/l/I (one/lowercase L/uppercase i) to prevent transcription errors. For strings that are only copied and pasted electronically, disable this option to maximize entropy and strength.

Can I generate strings in bulk?

Yes! Use the count slider to generate up to 100 strings at once. This is perfect for bulk test data creation, generating multiple API keys for different services, creating unique session IDs, or seeding databases with random identifiers. You can export all generated strings as TXT, JSON, CSV, JavaScript arrays, Python lists, or SQL INSERT statements.

What is string entropy?

Entropy measures unpredictability in bits, calculated as length × log₂(charset_size). Higher entropy means exponentially harder to guess or crack by brute force. A 64-bit entropy string would take millions of attempts to crack. 128-bit entropy (our “strong” rating) would take billions of years with current technology. 192+ bits is considered very strong and virtually uncrackable.

FAQ

Frequently asked questions

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