Random String Generator

Generate random strings with custom lengths and character sets. Include letters, numbers and symbols and copy results instantly.

String length

Quantity

Lowercase letters (a–z) Uppercase letters (A–Z)

Digits (0–9) Symbols (!@#$…)

–

Strings are built locally from secure random values using the browser Web Crypto API.

How to Use

Set the length of each string, up to 256 characters.
Choose the character sets to include.
Set how many strings you need and press Generate strings.
Copy the result or generate again; change settings any time.

How It Works

Each character position is filled from the combined character set using crypto.getRandomValues() with unbiased sampling. Characters are drawn independently, which means the expected composition matches your selected mix but individual strings can deviate — a 6-character string with symbols enabled may legitimately contain none. That independence is what makes the output suitable as varied test data.

This page intentionally does not guarantee per-type inclusion; that behavior belongs to the password generator, where predictability matters more than variety. For security-sensitive identifiers, prefer the password generator and its entropy guidance. For non-security uses it is also a convenient random character generator for identifiers, slugs and test fixtures.

Examples

Test IDs: length 10, letters and digits, quantity 5 → values like aK4mZq91Lp.
URL-safe token (non-secret): lowercase, uppercase and digits, length 22.
Sample data: 20 strings of length 8 to populate fixture fields.
Symbol exercise: symbols and digits only, length 12, to test form validation.

Common Uses

Generating identifiers, slugs and placeholders for software testing.
Filling fixtures, seed data and database columns with varied values.
Creating random codes for games, worksheets and classroom activities.
Producing sample data for UI mockups and documentation.

Frequently Asked Questions

Is this the same as the password generator?

No. This tool creates configurable strings for identifiers, tests and placeholders. For credentials, use the Random Password Generator, which is designed for security and never logs or stores output.

What character sets can I combine?

Lowercase letters, uppercase letters, digits and symbols can be enabled in any combination. Each character is drawn from the combined set with crypto.getRandomValues(), so the mix you choose is exactly the mix you get on average.

Why is my string missing a symbol?

Characters are drawn independently, so a short string may contain no symbol even when symbols are enabled. If you need guaranteed inclusion of every selected type, use the password generator, which enforces it.

Can I generate many strings at once?

Yes, up to 50 per batch. Copy a single string or the whole newline-separated list. Nothing is saved after you leave the page.

Are random strings safe to use as IDs?

For non-security uses like test data, yes. If an identifier must be unguessable, generate at least 128 bits of randomness: 22 or more characters from the full set, or use the password generator.

Last updated: September 20, 2026

Random String Generator