Random Hexadecimal Number Generator

How to use

1. 1️⃣
   Choose your options above
2. 2️⃣
   Click Generate
3. 3️⃣
   Copy your result

Detailed instructions

1. Set the count field to how many hex numbers you need, for example 20 for a batch test dataset.
2. Choose a bit width from the selector — 8-bit for byte values, 16-bit for short integers, 32-bit for addresses, or Custom to enter your own digit length.
3. Select your preferred prefix (0x for source code, # for CSS colors, or none for raw output) and pick uppercase or lowercase casing.
4. Click Generate to produce the list of random hex numbers instantly.
5. Copy the output and paste it directly into your code, design tool, or test file.

Use Cases

• •Populating C struct fields with random 32-bit values for register map unit tests
• •Generating bulk 6-digit hex color codes with a # prefix for Figma palette exploration
• •Creating mock 8-bit byte sequences to seed a fuzzing corpus in a Rust test suite
• •Filling a Postman environment file with random 0x-prefixed 16-bit token placeholders
• •Producing lowercase hex seeds for SHA-1 placeholder data in a staging Postgres database

Tips

• →For CSS work, pair 6 custom digits with # prefix and uppercase — the output pastes directly into any stylesheet or Figma color field.
• →When testing C code, use 32-bit with 0x prefix and uppercase; the output matches the format most C compilers expect for integer literals.
• →Generate a batch of 8-bit values to simulate random byte arrays for testing serialization, parsing, or checksum logic.
• →Lowercase output is preferred in many Linux tools and Python scripts where hex strings are compared directly — check your target environment first.
• →For MAC address mock data, use custom digits set to 12 with no prefix, then manually insert colons every two characters in your editor.
• →If you need repeatable results for reproducible tests, save a generated list and commit it to your repo rather than regenerating each run.

FAQ