Free Random String Generator

Need random strings that aren't passwords? Nonces, salts, test data, identifiers, and coupon codes all need controlled randomness. The Random String Generator lets you define exactly which characters are allowed — or type a fully custom charset — then generates batches of strings with cryptographic randomness, showing the entropy of each.

Private by design. This tool runs 100% in your browser — generated strings are never uploaded, stored, or transmitted anywhere.

How to Use the Random String Generator

  1. Set the length and how many strings you need.
  2. Pick character sets or type a custom charset.
  3. Click Generate strings.
  4. Copy all or download the list.

Features

Preset and fully custom charsets; hex-only mode; lengths 1–256; up to 50 per batch; entropy display; copy and download.

Benefits & Use Cases

Create test fixtures, generate coupon or invite codes, produce salts and nonces, or build randomized identifiers for prototypes.

Tips

For codes humans will type, use a custom charset without ambiguous characters. The tool already deduplicates your charset automatically.

Frequently Asked Questions

What can I use random strings for?

Salts, nonces, test data, coupon codes, request IDs, and anywhere you need unpredictable text that isn't a user password.

How does the custom charset work?

Type any characters and the tool draws only from those — perfect for 'ABCDEFGHJKLMNPQRSTUVWXYZ23456789'-style unambiguous code alphabets.

Are these cryptographically secure?

Yes. All strings use crypto.getRandomValues, the same source as the password tools — suitable for security-sensitive nonces and salts.

Why does it show entropy?

So you can sanity-check strength: a 16-character string from 64 symbols has 96 bits — plenty for a nonce, while a 6-character coupon code is guessable by design.

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