Random String Generator Cryptographically Secure String Generation

Generate cryptographically secure random strings for passwords, API keys, tokens, and test data. Features customizable character sets, 5 preset templates, advanced security requirements, and bulk generation capabilities. Perfect for authentication systems, API development, and security-critical applications.

🔐 Cryptographically Secure

🎨 5 Preset Templates

⚙️ Advanced Requirements

Download DevUtilities 👀 See Features

DevUtilities Random String Generator Screenshot showing password generation with security options

Advanced Random String Generation Features

Everything you need for secure random string generation in professional development workflows.

🔐

Cryptographically Secure

Uses SecRandomCopyBytes for true cryptographic randomness with rejection sampling to eliminate bias. Safe for generating passwords, tokens, and security-critical identifiers.

🎨

5 Built-in Presets

Quick templates for common use cases: Strong Password (16 chars), API Key (32 chars), Hex String (64 chars), PIN Code (6 digits), and Readable Code (12 chars).

⚙️

Customizable Character Sets

Choose from uppercase letters, lowercase letters, numbers, symbols, or define your own custom character set for specialized requirements.

✅

Advanced Requirements

Enforce minimum requirements for uppercase letters, numbers, or special characters to meet strict password policies and security standards.

📊

Bulk Generation

Generate up to 20 random strings simultaneously for batch operations, test data creation, or provisioning multiple API keys at once.

📏

Flexible Length Control

Configure string length from 1 to 100 characters with an intuitive slider. Perfect for everything from short PINs to long API tokens.

📋

Easy Copy & Export

One-click copying for individual strings or bulk copy all generated strings at once. Seamlessly integrate with your development workflow.

Built-in Preset Templates

Quick-start templates optimized for common use cases

🔒

Strong Password

16-character password with mixed case letters, numbers, and symbols. Enforces at least one uppercase, one number, and one symbol for maximum security.

🔑

API Key

32-character alphanumeric string. Perfect for API authentication tokens and service identifiers.

🔢

Hex String

64-character hexadecimal string (0-9, A-F only). Ideal for hash-like identifiers, session tokens, and cryptographic key representations.

📱

PIN Code

6-digit numeric code for simple authentication. Numbers only (0-9) for easy manual entry on keypads and mobile devices.

👀

Readable Code

12-character alphanumeric code. Great for activation codes and invite codes users need to type.

🎯

Custom

Full control over character sets, length, quantity, and requirements. Define your own rules for specialized security requirements.

How to Generate Random Strings

Create secure random strings in just a few simple steps.

Choose a Preset

Select from 5 built-in presets (Strong Password, API Key, Hex String, PIN Code, Readable Code) or start with Custom settings.

Configure Options

Adjust length (1-100), quantity (1-20), character sets, and security requirements like enforcing uppercase, numbers, or symbols.

Generate Strings

Click Generate to create cryptographically secure random strings. Results appear instantly with statistics showing total characters.

Copy & Use

Copy individual strings or use "Copy All" for bulk operations. Strings are ready to use in your applications, APIs, or databases.

Perfect for These Development Tasks

🔐

Password Generation

Generate strong, secure passwords for user accounts, admin panels, and service credentials with enforced complexity requirements.

🔑

API Key Creation

Create unique API keys, access tokens, and service identifiers for authentication systems and third-party integrations.

🎫

Session Tokens

Generate session IDs, CSRF tokens, and temporary authentication tokens for web applications and mobile apps.

🧪

Test Data Generation

Create random test data for unit tests, integration tests, and database seeding with consistent character patterns.

🎟️

Activation Codes

Generate license keys, activation codes, invite codes, and promo codes for software licensing and marketing campaigns.

🆔

Unique Identifiers

Create unique IDs for database records, file names, temporary folders, and resource identifiers in distributed systems.

Frequently Asked Questions

How secure are the generated random strings?

Very secure! DevUtilities uses SecRandomCopyBytes, Apple's cryptographically secure random number generator, with rejection sampling to eliminate modulo bias. This is suitable for security-critical applications including password generation and cryptographic keys.

What's the difference between presets and custom mode?

Presets are optimized templates for common use cases (passwords, API keys, etc.) with pre-configured settings. Custom mode gives you full control over all parameters including character sets, length, and requirements.

What do the requirement options do?

Requirements enforce that generated strings must contain at least one character from specified sets (uppercase, number, symbol). This helps meet strict password policies and ensures strings have sufficient complexity for security.

Can I generate the same random string twice?

No, the tool generates truly random strings each time. With cryptographic randomness and large character sets, the probability of generating identical strings is astronomically small (virtually impossible for practical purposes).

What's the maximum string length and quantity?

You can generate strings from 1 to 100 characters in length, and create up to 20 strings at once. These limits ensure optimal performance while covering the vast majority of use cases.