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Generate Custom Hex

Create a hex with specific properties (length, pattern, etc). Runs entirely in your browser, so your data never leaves your device.

Output

The result appears here as you type.

Options

How to use Generate Custom Hex

  1. 1. Write a Pattern. Start in the Pattern field, where x stands for a random digit and every other character passes through literally. A pattern like ffxx00 pins the first and last bytes while randomizing the middle.
  2. 2. Or just set a Length. If you leave the pattern empty, the Length field takes over and produces a fully random hex string of that many digits. Use this mode when you have no fixed structure to preserve.
  3. 3. Copy the generated value. The finished hex appears in the output pane. Copy it out, and regenerate as often as needed; the fixed characters stay put while each x is redrawn every run.

When to use Generate Custom Hex

Generate Custom Hex creates hexadecimal values that follow a template you control, mixing literal digits with randomized positions. Plain random generators cannot express constraints like a fixed vendor prefix or a constant trailing byte, and this tool exists precisely for those structured cases.

  • Mocking MAC addresses with a real vendor prefix. Your network simulator should emit devices from one manufacturer, so the first six hex digits must match a real OUI. A pattern with that prefix and x for the rest generates plausible addresses endlessly.
  • Generating themed color variations. A designer wants oranges only, meaning the red channel stays ff while green and blue vary. The pattern ffxx00 spits out candidate shades far faster than dragging a color picker.
  • Building IDs with an embedded type code. Your system encodes a record type in the third and fourth digits of every hex ID. Templating those two positions as literals produces valid-by-construction sample IDs for tests and demos.
  • Stress-testing validators with edge patterns. To probe a parser that special-cases leading zeros, generate batches from patterns like 00xxxxxx and compare against fully random ones from the length mode.

Examples

Pattern

Input

Output
ff3a00
About the Generate Custom Hex tool
Generate Custom Hex does its work locally, right in the browser. Create a hex with specific properties (length, pattern, etc). There is no upload step, no queue and no account, and your data never travels over the network.
It belongs to the Hex Tools collection on EditSafely, a set of 108 small, focused Hex utilities that share the same instant, private workspace.
You can shape the output with 2 settings, including Pattern (x = random digit) and Length (if no pattern), and the result refreshes the moment you change one. A worked example further down the page shows exactly what the tool produces for a real input.
Running locally also makes the tool fast and dependable: results appear as you type or drop a file, there is no server outage that can take it down mid-task, and confidential data can be processed without a second thought.
Frequently asked questions
Does Generate Custom Hex cost anything?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Does the generator send anything to a server?
No data leaves your device. The whole tool is JavaScript that runs inside your browser tab, so there is no upload, no server-side processing and no log of what you did. If you disconnect from the internet after the page loads, it keeps working.
How do I get a different result?
Run the generator again. Each run is computed fresh on your device, and any options you change are applied to the next result immediately.
Do I need to sign up or install anything?
Nothing to install and no account needed. Open the page in any up-to-date browser, including on a phone or tablet, and the tool is ready.
How do I use the result?
The output panel has a one-click copy button, and you can keep refining the input while you work; the result updates in place as you type.