Random String Generator
Generate random strings with configurable length and character sets using cryptographically secure randomness for testing, development and general-purpose data generation.
What is Random String Generator?
Generate random strings with a configurable length and character set. Choose uppercase letters, lowercase letters, numbers and symbols, then generate up to 100 strings at once for test data and other development tasks.
How to use
- Choose the string length, from 1 to 256 characters.
- Select the character sets to include.
- Choose how many strings to generate, from 1 to 100.
- Click Generate to create the random strings.
- Copy the complete result if needed.
Features
- Configurable string length from 1 to 256 characters
- Uppercase letters
- Lowercase letters
- Numbers
- Special characters
- Batch generation of 1 to 100 strings
- Cryptographically secure random generation
- Unbiased character selection
- One-click regeneration
- Copy all generated strings
Common Use Cases
- Generating test data
- Form testing
- Mock application data
- Development and prototyping
- Placeholder values
- Randomized test cases
Example
String length: 16 Number of strings: 3 Character sets: Lowercase, Uppercase, Numbers
K7mP2xQ9vR4nL8sT f3N6cH5jB1zX8wY2 q9W4rT7yU2iO6pA3
FAQ
Can I choose the length of the random strings?
Yes. You can configure each string to contain between 1 and 256 characters.
Which characters can be included?
You can independently enable lowercase letters, uppercase letters, numbers and special characters. At least one character set must be selected.
Can I generate multiple strings at once?
Yes. You can generate from 1 to 100 random strings in one operation.
Are generated strings cryptographically secure?
The generator uses crypto.getRandomValues() and rejection sampling to select characters without modulo bias. This provides a cryptographically strong source of randomness, although security also depends on how the generated strings are used.
Can I use the generated strings as passwords?
The generator uses cryptographically strong randomness, but it does not enforce password-specific requirements or evaluate password strength. For passwords, use a dedicated password generator with appropriate length and character policies.
What happens if I deselect every character set?
The generator displays an error asking you to select at least one character set before generating strings.
Missing a feature?
If this tool doesn't cover your use case or is missing functionality, please let me know through the Contact page.
New improvements and features are added based on user feedback.