Generate Custom Numbers
Create numbers of arbitrary length and properties. Runs entirely in your browser, so your data never leaves your device.
Output
The result appears here as you type.
How to use Generate Custom Numbers
- 1. Set how many numbers you need. Enter the count in How many numbers and set Digits per number to the length each one should have. The tool builds that many independent numbers of exactly that digit length.
- 2. Control the digit pool and leading zeros. Type the characters you want to draw from into Digit set (for example just 13579 for odd digits only), and toggle Allow leading zeros if a number like 0042 should be valid output.
- 3. Choose a separator. Set the Separator field to a comma, space or newline so the batch pastes cleanly into a spreadsheet column or a script argument list.
- 4. Copy the generated numbers. Copy the result straight from the output pane into your test fixture, seed script or spreadsheet.
When to use Generate Custom Numbers
Generate Custom Numbers builds a batch of numbers with an exact digit length and an exact set of allowed digits, which plain random number generators cannot guarantee. Use it whenever you need test data that looks like a specific ID or account format rather than an arbitrary integer.
- Mocking account or invoice numbers. A backend fixture needs one hundred fake account numbers that are always exactly eight digits. Setting Digits per number to 8 and allowing leading zeros produces IDs that match the real format for a QA seed script.
- Testing a form's digit restrictions. A registration form only accepts codes built from digits 2 through 9. Restricting Digit set to 23456789 generates values that exercise the validator without ever producing a rejected character.
- Building a lottery or bingo style card. A hobby project needs rows of six-digit numbers with no leading zero collisions. Turning off Allow leading zeros keeps every number visually full-width for a printed card layout.
Examples
Five 5-digit numbers
Output
48213, 90542, 17760, 33081, 62497
Numbers drawn from only the digits 1, 3 and 7
Output
731, 137, 313, 771, 133
About the Generate Custom Numbers tool
Generate Custom Numbers does its work locally, right in the browser. Create numbers of arbitrary length and properties. There is no upload step, no queue and no account, and your data never travels over the network.
It belongs to the Number Tools collection on EditSafely, a set of 194 small, focused Number utilities that share the same instant, private workspace.
You can shape the output with 5 settings, including How many numbers, Digits per number, Allow leading zeros and Digit set, and the result refreshes the moment you change one. 2 worked examples further down the page show exactly what the tool produces for real inputs.
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
Is Generate Custom Numbers free to use?
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?
Everything happens locally. Your browser downloads the tool's code once, then does all the processing itself; nothing you enter is transmitted, stored or logged. You can even go offline after the page loads and it will still work.
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?
No. The tool works in any modern browser on desktop, tablet or phone. There is no account to create, no extension to add and no software to install.
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.