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Random String Generator

Build secure, customizable random strings for passwords, tokens, testing, or everyday tasks.

Generator Settings

Up to 256 characters.

Generate up to 50 strings at a time.

Character Sets

You can add 200 more custom characters.

Quick Toggles

Generated Strings

Press Generate to create random strings.

How to Use the Random String Generator

  1. Set the length between 1 and 256 characters.
  2. Pick uppercase, lowercase, digits, symbols, or add custom characters.
  3. Choose how many strings to generate and add prefixes or suffixes if needed. The Random String Generator keeps every variation aligned with your structure.
  4. Press “Generate Random Strings,” then copy or download the results. The Random String Generator is tuned for quick, repeatable output.

Each string is created in your browser with `crypto.getRandomValues`, so nothing ever leaves your device. The Random String Generator stays completely client-side.

Need random words or phrases? Visit Random Word Generator. Looking for single characters? Try the Random Letter Generatorinstead.

Working on codenames or character ideas? Pair this tool with the Random Name Generatorto keep the ideas flowing.

Common use cases

  • Secure passwordsCombine uppercase, lowercase, digits, and symbols, then tag each password with a helpful prefix. The Random String Generator keeps that mix consistent every time.
  • Development and testingGenerate throwaway API keys, JWT fragments, fixtures, or cache keys in seconds. The Random String Generator handles every batch without fuss.
  • Games and giveawaysBatch-create room codes, redemption codes, or invite links for quick sharing.
  • Automation scriptsDrop random seeds into CI/CD or QA scripts without pausing your workflow.

Practical tips

  • Longer strings are harder to guess—16+ characters is a solid baseline.
  • Use the custom character field when a system bans certain symbols.
  • Prefixes and suffixes help flag environments like `dev-`, `stg-`, or `-beta`.
  • Store fresh passwords in a manager or vault as soon as you generate them.

How It Works Under the Hood

Supported browsers rely on the Web Crypto API’s `crypto.getRandomValues`. That keeps the character pool even on every draw. When the API is missing we fall back to `Math.random` and call out the reduced security.

Your selected sets and custom characters are merged, deduplicated, and trimmed. The pool stays balanced, and everything runs on the client, so nothing is stored or transmitted. The Random String Generator never ships data to a server.

Frequently Asked Questions

Are the generated strings secure?

We rely on the Web Crypto API’s cryptographically secure generator. It is far harder to predict than common pseudo-random methods.

Choose a generous length and mix multiple character sets to satisfy most security policies.

Can I reproduce the exact same batch?

This tool does not support seed-based reproduction. Every run produces fresh strings.

For deterministic output, create a script with your own algorithm and a fixed seed.

Why do I see “Select at least one character set”?

The alert appears when every character set is disabled and the custom field is empty. With no pool to draw from the generator halts.

Enable at least one built-in set or add custom characters before generating strings.

Can I export the results in other formats?

You can copy everything or download a TXT file.

Paste the output into CSV, JSON, or your password manager as needed.

Combine TXT exports with batch runs to automate conversions.