Random String Generator

Generate random strings for tokens, coupon codes, test data and identifiers using a cryptographically secure generator.

FreeNo sign-upRuns in your browserMobile-friendly

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What does the Random String Generator do?

Choose a length, quantity and character set — letters and digits, hex, URL-safe Base64 alphabet, lowercase, uppercase, digits, everything including symbols, or your own custom characters (great for coupon codes that avoid confusing characters). Add an optional prefix such as key_.

The tool shows how many bits of randomness each string has. For secret tokens, aim for at least 128 bits — for example 32 hex characters or 22 URL-safe characters.

How to use the Random String Generator

  1. Set the length and how many strings you need.
  2. Choose a character set or enter custom characters.
  3. Optionally add a prefix.
  4. Copy or download the list.

Examples

API key

32 characters from hex → 128 bits, like 9f3c1a7e….

Coupon codes

Custom set ABCDEFGHJKMNPQRSTUVWXYZ23456789 with length 8 avoids 0/O and 1/I confusion.

Common use cases

  • API keys and session tokens (for development)
  • Coupon and voucher codes
  • Test data and fixtures
  • Unique file names

Features and benefits

  • Private by design — your data is processed on your device and never uploaded.
  • Free with no account, no watermark and no usage limits.
  • Works on phones, tablets and desktops in any modern browser.

Limitations to know

  • Generated values are not stored — save them immediately.
  • For production secrets, generate them on the server that uses them.

Frequently asked questions

How random are the strings?

They use crypto.getRandomValues() with unbiased selection.

How long should a token be?

At least 128 bits of entropy for secrets.

Can I avoid confusing characters?

Yes, use a custom set without 0, O, 1, I and l.

Embed this tool on your website

Add the free Random String Generator to your blog or website. Paste the code into your page’s HTML; the tool runs in your visitors’ browsers and stays up to date automatically. Please keep the credit line below the tool.

Free to use on any website. The tool runs inside an iframe served from viptools.pk; nothing your visitors type is sent to your site or ours. Preview the embedded version.

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