Random Hex Generator
Create cryptographically secure random hexadecimal numbers. Customize length (1-64 digits), generate up to 100 values at once, toggle case and prefix, and enforce unique values — all locally in your browser.
All hex numbers are generated locally in your browser using crypto‑grade randomness. No data is ever uploaded or stored.
Secure Random Hexadecimal Number Generator
A random hex generator creates numbers in base‑16 (hexadecimal) format using digits 0-9 and letters A-F. Hexadecimal is widely used in programming, cryptography, and system design because each digit represents exactly 4 bits of binary data, making it a compact way to handle binary information. Our hex number generator uses cryptographically secure pseudorandom number generation (CSPRNG) to ensure truly random output suitable for security‑sensitive applications like API keys, session IDs, and cryptographic test data.
Every hex digit is generated using your browser's built‑in Crypto.getRandomValues() — industry‑standard randomness for security.
Set any length from 1 to 64 digits. Common options: 2 digits (8‑bit), 4 digits (16‑bit), 8 digits (32‑bit), 16 digits (64‑bit), 32 digits (128‑bit), or 64 digits (256‑bit).
Generate between 1 and 100 random hex numbers in a single batch — ideal for test data, bulk identifiers, and memory simulation.
Choose between uppercase (A-F) or lowercase (a-f) letter formatting. Both are functionally identical but suit different style preferences.
Add the standard "0x" prefix for programming contexts (C, C++, JavaScript, Python, Solidity) or disable it for raw hex values.
Enable the unique option to guarantee no duplicates in your batch — essential for generating IDs, session tokens, and distinct addresses.
How to Use This Random Hex Generator
1. Set the number of hexadecimal digits (1‑64). For 32‑bit values, use 8 digits; for 64‑bit, use 16 digits.
2. Choose how many random hex numbers to generate (1‑100).
3. Select uppercase or lowercase letters for the hex characters.
4. Optionally check "Add 0x prefix" for programming‑style output (e.g., 0xABCD1234).
5. Check "Generate unique values" if you need all results to be distinct (no duplicates).
6. Click "Generate Random Hex" to produce your values instantly.
7. Copy the results to your clipboard with one click.
Why Use This Free Hex Generator?
- 100% free online hex generator — no signup, no watermarks, no usage limits.
- Cryptographically secure randomness — perfect for API tokens, nonces, and security testing.
- No uploads, no servers — everything runs locally in your browser. Your data never leaves your device.
- Flexible configuration — length, quantity, case, prefix, and unique options give you complete control.
- Works offline and on all devices — once loaded, the tool works without internet.
- Ideal for developers, testers, and security professionals — generate hex values for memory addresses, UUIDs, cryptographic test vectors, and more.
Hexadecimal Number Reference
Hexadecimal (base‑16) is the standard way to represent binary data in human‑readable form. Each hex digit corresponds to exactly 4 binary bits:
- 1 hex digit = 4 bits (0 to 15, 1 nibble)
- 2 hex digits = 8 bits (0 to 255, 1 byte)
- 4 hex digits = 16 bits (0 to 65,535)
- 8 hex digits = 32 bits (0 to 4,294,967,295) — common for 32‑bit integers and memory addresses
- 16 hex digits = 64 bits — common for 64‑bit integers, timestamps, and unique IDs
- 32 hex digits = 128 bits — used for UUIDs and cryptographic keys
- 64 hex digits = 256 bits — common for SHA‑256 hashes and modern encryption keys
Frequently Asked Questions
Learn how to use this tool correctly by reading our step-by-step tutorial.
