Central Tools

Random String Generator

Generate random alphanumeric strings for API keys, tokens, and unique identifiers.

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How to use Random String Generator

1

Set the desired length (1-128 characters).

2

Choose character types to include.

3

Click 'Generate Random String'.

Why use this tool?

Customizable

Control length and character types.

Instant

Generate strings in milliseconds.

Versatile

Perfect for tokens, IDs, and test data.

Free Random String Generator - Create Secure Random Text

Generate cryptographically secure random strings for API keys, access tokens, voucher codes, and unique identifiers. Customize length and character sets (uppercase, lowercase, numbers, symbols). Perfect for developers building authentication systems, generating promo codes, or creating test data. All strings generated locally—no server interaction.

Quick How-To Guide

  1. 1Set the desired string length (4 to 256 characters)
  2. 2Select character types: uppercase, lowercase, numbers, and/or symbols
  3. 3Choose quantity (1 for single string, up to 1000 for bulk)
  4. 4Enable "Exclude Ambiguous" to avoid confusing characters (optional)
  5. 5Click "Generate" and copy your random strings

Why use our tool?

Cryptographically secure—uses Web Crypto API for unpredictable random strings
Fully customizable—set length (4-256 characters) and choose character types
Bulk generation—create up to 1000 random strings simultaneously
Multiple character sets—uppercase, lowercase, numbers, symbols, or custom characters
Avoid ambiguous characters—option to exclude confusing characters (0/O, 1/l/I)
Instant generation—create thousands of strings in seconds

Frequently Asked Questions

Find answers to common questions about using our tool, its features, and how it handles your data privacy.

Random strings serve many purposes: API keys and access tokens for authentication, session IDs for web applications, voucher/promo codes for marketing, password reset tokens, temporary file names, database record IDs, test data generation, CAPTCHA challenges, and nonce values for cryptographic operations. They provide unpredictability and uniqueness where needed.
Yes, when generated with sufficient length and character variety. For API keys, use at least 32 characters with all character types. For session tokens, 24-32 characters is standard. For high-security applications, use 40+ characters. Our tool uses the Web Crypto API which is cryptographically secure. However, token security also depends on secure transmission (HTTPS), storage, and expiration policies.
This option removes characters that look similar and are easily confused: 0 (zero) vs O (letter), 1 (one) vs l (lowercase L) vs I (uppercase i). This is crucial for voucher codes or keys that users manually type. For example, a promo code "IL0O1" could be misread as "ILO01" or "IL001". Excluding ambiguous characters improves usability.
With sufficient length, the probability is negligible. A 16-character string with 62 characters (A-Z, a-z, 0-9) has 62^16 = 4.7×10^28 possible combinations. Even generating millions of strings, duplicates are virtually impossible. For absolute guarantee of uniqueness, combine random strings with timestamps or use UUIDs instead.
Voucher codes: 8-12 characters. Session IDs: 16-24 characters. API keys: 32-40 characters. Password reset tokens: 32+ characters (+ expiration). Temporary file names: 8-16 characters. The higher the security requirement, the longer the string. Balance security with usability—6-character codes are user-friendly but less secure.
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