Free random string generator for developers.
Generate secure random strings for test data, identifiers, temp codes, and more. Customize length and character sets to get exactly the format your app or script needs.
Flexible random strings, generated locally
Need an alphanumeric token, a numeric code, or a string with a very specific character set? This tool uses cryptographically secure randomness to generate strings directly in your browser—no servers, no logging.
- Choose from common presets: alphanumeric, numeric, letters, and more.
- Define your own custom character set when you need full control.
- Set string length and generate multiple values in one batch.
- Copy a single string or the whole list with one click.
Tip: For long-term secrets or API keys, use our API key generator instead. This tool is aimed at general-purpose random strings and developer utilities.
Generate random strings
Configure the character set and length, then generate a batch of random strings entirely in your browser.
Alphanumeric is a good default for most cases. Use custom to define your own allowed characters.
Entropy: 95.3 bits (High)
Strong uniqueness for most developer workflows.
For secrets that protect accounts or data, pair this tool with dedicated password and token generators rather than relying on arbitrary strings.
Character space & entropy
- Max length per string
- 32
- Preset character sets
- 1
- Entropy per char (alnum)
- 3 bits
- Strings generated (all time)
- 50K+
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How it works
A simple UI for flexible random strings.
Under the hood, this tool uses secure browser APIs to generate random numbers and map them to characters in your chosen pool. You control the pool and the length; we handle the randomness.
1. Pick a preset or custom set
Start with presets like alphanumeric or numeric codes, or define your own character set when you need very specific formatting.
2. Set length and batch size
Configure how long each string should be and how many strings you want per batch. Great for fixtures, seeds, and quick IDs.
3. Generate & copy
Generate a fresh batch, scan the results, and copy either individual strings or the whole list to drop into code, config, or tests.
Usage tips
When to use random strings vs. stronger secrets.
Random strings are useful everywhere—from test data to temporary codes. Just be clear on when you need simple randomness versus higher-assurance secrets.
Great for testing and IDs
Use random strings for test users, fixture data, one-off IDs, and anything that just needs to be unique and non-obvious.
Use dedicated tools for secrets
For API keys, encryption secrets, or long-term credentials, prefer your dedicated API key generator instead of arbitrary strings.
Mind your character rules
Some systems only accept certain characters. Use a custom set or presets that match the allowed character class for that system.
Keep logs and screenshots clean
Even if a string is "just test data," avoid reusing it as a real secret later—especially if it has already appeared in logs or screenshots.
FAQ
Random string generator questions, answered.
Learn how this tool works and how its randomness compares to other generators.
Are strings generated securely?
Yes. The generator uses window.crypto.getRandomValues to produce random numbers, which is suitable for most security-sensitive client-side use cases.
Is anything I generate stored or sent anywhere?
No. All generation happens in your browser. We don't send or log the strings you create.
How is this different from the API key generator?
The API key generator focuses on random bytes encoded as hex or Base64 for secrets. This random string tool focuses on flexible character sets and lengths for more general text use cases.
Can I use this for passwords?
You could, but you'll get a better experience from your password generator or passphrase generator, which are tuned specifically for credentials.
Random String Generator
Built for quick dev workflows
Generate IDs, test values, and throwaway codes without leaving your browser or writing one-off scripts.
Need structured identifiers instead? Try our UUID & ULID generator or API key generator.