Random String Generator
Generate random strings with custom character sets.
Random String Generator creates cryptographically random strings of any length directly in your browser. Toggle lowercase, uppercase, digit, and symbol character sets to build tokens, IDs, test data, or short codes without uploading anything.
How it works
Set a length and choose which character sets to include, then click Generate. The tool builds a combined charset from your selections and picks each character using crypto.getRandomValues with rejection sampling, avoiding bias toward any character.
Benefits
- Cryptographically secure randomness via Web Crypto
- Independent lowercase, uppercase, digit, and symbol toggles
- Supports lengths from 1 to 512 characters
- No server upload—strings stay in your browser
Use cases
- Generate API keys or tokens for local development
- Create random test fixtures and mock identifiers
- Produce short random codes for invites or coupons
- Build random slugs or filenames for prototypes
Best practices
- Use longer lengths (32+ characters) for anything security-sensitive
- Enable all character sets for maximum entropy per character
- Use Password Generator instead when generating actual login passwords
- Regenerate rather than reuse strings across unrelated resources
Common mistakes
- Disabling every character set, leaving nothing to generate from
- Using a very short length for something meant to be unguessable
- Assuming this tool tracks or validates uniqueness across generations
- Reusing the same generated string across multiple environments
Privacy
Strings are generated locally with crypto.getRandomValues. ToolHub does not receive, log, or store generated strings unless you separately enable on-device history.
Frequently asked questions
- How is this different from Password Generator?
- Random String Generator is a general-purpose tool for tokens, IDs, test data, and codes, while Password Generator is tailored to passwords with a strength meter and sensitive-tool defaults.
- Which character sets can I include?
- Toggle lowercase letters, uppercase letters, digits, and symbols independently. At least one character set must remain enabled to generate a string.
- How long can the generated string be?
- You can generate strings from 1 to 512 characters, which covers typical tokens, slugs, and test fixtures. Adjust the length field and click Generate.
- Is the randomness suitable for security tokens?
- Yes. Each character is selected using crypto.getRandomValues with rejection sampling, providing cryptographically secure randomness suitable for tokens and identifiers.
- Can I use this for passwords?
- You can, but consider using Password Generator instead—it includes a local strength estimate and defaults to sensitive-tool history settings for better password hygiene.
- Does this tool upload generated strings anywhere?
- No. All generation happens locally in your browser using the Web Crypto API. ToolHub never receives your generated strings.
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