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Random Hex String Generator

Generate cryptographically strong random hex strings — ideal for IDs, tokens, and test fixtures

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Case:
Input
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Output

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What is Random Hex String Generator

Last reviewed:

Hexadecimal (base 16) uses digits 0-9 and letters A-F to represent bytes compactly, widely used for colors, hashes, and low-level binary data.

Random Hex String Generator mints random hex strings using the Web Crypto API. You pick the length, case (lowercase / uppercase), and batch count.

Great for API secrets, deterministic test IDs, CSRF nonces, and even 8-character color IDs.

Why use it

  • Mint secret tokens that fit hex-only fields.
  • Generate deterministic-looking IDs for tests.
  • Create 6-char hex IDs for colors or assets.
  • Produce CSRF nonces at scale.
  • Seed databases with unique hex keys.

Features

  • Web Crypto API backed
  • Configurable length & case
  • Up to 10,000 strings per batch
  • One string per line output
  • Random Hex String is handled entirely in-browser

How to use Random Hex String Generator

  1. Set length. Enter the desired hex length.
  2. Pick case. Lowercase or uppercase.
  3. Run. Copy the list of hex strings.

Example (before/after)

Input

16

Output (length=16, count=3)

9e2fb3a714c8d0e5
0c6a19f87b3e2d4a
f18d3b9c2a0e765d

Common errors

Odd length

Some systems expect even-length hex.

Fix: Use a multiple of 2 for byte-aligned output.

Case mismatch

Some APIs only accept one case.

Fix: Toggle uppercase/lowercase in the toolbar.

FAQ

Is it cryptographically secure?

Yes — it uses `crypto.getRandomValues`.

What's the maximum length?

1024 characters per hex string, up to 10,000 per batch.

Can I output uppercase?

Yes — switch via the toolbar.

Can I use these as tokens?

Yes — 32+ hex characters (128+ bits) is a common token length.

Is input uploaded?

No — hex tokens are drawn from your browser's crypto.getRandomValues so nothing leaves the page.

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