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▶ Developer Tools for Random Data Generation // v2.13.1
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Random String Generator

Generate random strings, words, letters, and text with customizable options

Our random string generator helps you generate random strings with customizable lengths and formats. Generate-Random.org provides a free string generator that creates alphanumeric strings, words, letters, sentences, and more. This CSPRNG string generator uses cryptographically secure random generation for maximum security. Generate strings for API keys, secure passwords, test data, and unique identifiers. Support for multiple formats: alphanumeric, hexadecimal, Base64, UUID, and natural language text. No signup required, completely free.

Related Random Generators

PASSWORD GENERATOR →

Generate strong random passwords with customizable length and complexity. NIST 2024 compliant with CSPRNG security.

$ generate --type=password --length=16
API KEY GENERATOR →

Generate secure API keys and tokens with custom formats and entropy levels. Perfect for authentication systems.

$ generate --type=api-key --format=hex --length=32

What is a Random String Generator?

A Random String Generator creates sequences of characters based on specified rules and character sets. Our generator uses cryptographically secure random number generation (CSPRNG) to ensure true unpredictability for security-critical applications.

Random strings are essential for creating unique identifiers, test data, security tokens, and placeholder content. For numeric data, try our number generator.

String Generator Configuration Options

Alphanumeric Strings

Generate random strings containing letters (A-Z, a-z) and numbers (0-9). Most versatile option for general-purpose identifiers, tokens, and codes. Supports customizable character sets and length up to 256 characters.
Options:
  • Character set: Uppercase, lowercase, numbers (customizable combinations)
  • Length: 1-256 characters for flexible sizing
  • Exclude ambiguous: Remove confusing characters (i, l, 1, L, o, 0, O)
  • Use cases: User IDs, session tokens, verification codes, short URLs

Random Words

Generate random English words from a curated dictionary of 6,785 common words. Ideal for creating readable test data, sample usernames, project codenames, and memorable identifiers. Similar to our passphrase generator but with more formatting options.
Options:
  • Word count: Generate 1-100 random words from English dictionary
  • Separator: Space, hyphen, underscore, comma, or newline
  • Capitalization: None, first letter only, or ALL CAPS

Random Letters

Generate sequences of random alphabetic characters only (no numbers). Useful for creating test strings, character patterns, alphabetic codes, and non-numeric identifiers.
Options:
  • Length: 1-1000 letters
  • Case: Lowercase, UPPERCASE, or Mixed case
  • Include spaces: Add random spaces for word-like patterns

Random Sentences

Generate grammatically structured sentences using real English words. Each sentence starts with a capital letter and ends with a period. Perfect for UI mockups, content testing, and sample text generation. For longer content, see our Lorem Ipsum generator.
Options:
  • Sentence count: 1-20 complete sentences
  • Separator: Space or newline between sentences
  • Auto-capitalization: Proper sentence structure

Random Paragraphs

Generate multi-sentence paragraphs with natural-looking text structure. Each paragraph contains multiple sentences with proper formatting. Ideal for blog post mockups, article templates, and content placeholders.
Options:
  • Paragraph count: 1-10 full paragraphs
  • Words per paragraph: 20-200 words for density control
  • Natural structure: Auto-split into sentences with proper punctuation

Hexadecimal Strings

Generate cryptographically secure hexadecimal strings (0-9, a-f). Essential for color codes, hash values, cryptographic keys, memory addresses, and API tokens. Uses CSPRNG for unpredictability.
Options:
  • Length: 1-256 hexadecimal characters
  • Case: Lowercase or UPPERCASE
  • Use cases: Color codes (#ff5733), SHA hashes, Ethereum addresses

Base64 Encoded Strings

Generate Base64-encoded strings from random bytes. RFC 4648 compliant encoding supporting standard and URL-safe variants. Perfect for API keys, authentication tokens, encrypted data representation, and binary data encoding.
Options:
  • Byte count: 1-256 random bytes (output ~33% longer)
  • URL-safe: Replace +/ with -_ for URL compatibility
  • Use cases: JWT tokens, OAuth secrets, file encoding

UUID Strings (v4)

Generate RFC 4122 compliant UUID v4 strings using cryptographically secure random generation. Universally unique identifiers perfect for database primary keys, distributed systems, and unique record identification. For more UUID options, see our dedicated UUID generator.
Features:
  • Format: Standard 8-4-4-4-12 format (e.g., 550e8400-e29b-41d4-a716-446655440000)
  • Version: UUID v4 (random) with 122 bits of entropy
  • Use cases: Database IDs, distributed systems, unique identifiers

How to Generate Random Strings

[STEP 1] Choose String Type

Select from alphanumeric, words, letters, sentences, paragraphs, hex, Base64, or UUID.

[STEP 1] Configure Options

Set length, character sets, capitalization, and formatting options.

[STEP 1] Generate & Export

Click generate and export results in TXT, CSV, or JSON format.

Common Use Cases

  • _ Generate API keys and authentication tokens
  • _ Create unique user IDs and session identifiers
  • _ Generate test data for software development
  • _ Create placeholder content for UI mockups
  • _ Generate verification codes and random keys
  • _ Create memorable project names and codenames

Technical Implementation

Our string generator uses cryptographically secure pseudo-random number generators (CSPRNG) to ensure unpredictable output suitable for security-critical applications. All character selection maintains uniform distribution across available character sets.

// Cryptographic random string generation
string = Σ(random_choice(charset) for i in length)

// Uniform distribution ensures equal probability for all characters
P(char) = 1 / |charset| for all char ∈ charset

API Access for Developers

GET https://generate-random.org/api/v1/generate/strings
VIEW FULL API DOCUMENTATION →

Frequently Asked Questions

What string types can I generate? ▶
You can generate 7 different string types: Alphanumeric (A-Z, 0-9), Words (English dictionary), Letters (A-Z only), Sentences (structured text), Paragraphs (multi-sentence), Hexadecimal (0-9, a-f), Base64 (encoded bytes), and UUID v4 (unique identifiers).
Are these strings cryptographically secure? ▶
Yes, all strings are generated using cryptographically secure pseudo-random number generators (CSPRNG) that meet security standards. This makes them suitable for authentication tokens, API keys, and other security-critical applications.
What's the difference between alphanumeric and hexadecimal? ▶
Alphanumeric uses all letters (A-Z) and numbers (0-9) for 62 possible characters. Hexadecimal uses only 0-9 and a-f for 16 characters, making it ideal for color codes, hash values, and low-level computing applications. Alphanumeric provides more entropy per character.
Can I generate multiple strings at once? ▶
Yes, you can generate multiple strings in one operation. The count option allows bulk generation for batch processing, test data creation, or generating multiple unique identifiers simultaneously. Export to CSV or JSON for easy integration.
What's the maximum string length? ▶
Maximum length varies by type: Alphanumeric/Hex/Base64 up to 256 characters, Letters up to 1000 characters, Words up to 100 words, Sentences up to 20, Paragraphs up to 10. For longer content needs, use our Lorem Ipsum generator.