Duplicate Integers
Create multiple copies of the input integers. Runs entirely in your browser, so your data never leaves your device.
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Output
The result appears here as you type.
How to use Duplicate Integers
- 1. Paste the integers. Enter one or more integers, one per line. Each entire value is repeated as a whole rather than duplicating its individual digits.
- 2. Set the repeat count and separator. Enter a value in Repeat count to control how many copies of each integer appear, and choose a Separator to control the spacing or punctuation between the repeated copies.
- 3. Copy the duplicated list. Copy the resulting output, for example 5 repeated three times becoming 5 5 5, and paste it wherever repeated copies of the original values are needed.
When to use Duplicate Integers
Duplicate Integers creates multiple copies of each integer in a list, repeating the whole value rather than its individual digits. Use it whenever you need the same number to appear several times in a row, such as for test data or a repeated pattern.
- Building repeated test values for a script. A test fixture needs the same sample value repeated several times to simulate duplicate entries. Set Repeat count to the number of copies you need and copy the result.
- Creating a repeating sequence for a pattern or design. A design or puzzle needs a number to repeat several times in sequence, with a specific separator, to form a recognizable repeating pattern.
- Simulating duplicate records for a deduplication test. You are testing a deduplication routine and need input containing deliberate duplicate values. Generate a batch of repeated integers here as the test input.
- Filling a placeholder list with a repeated constant. A configuration or mock dataset needs a placeholder value repeated a fixed number of times before real data replaces it. Generate the repeated list quickly here.
Examples
Repeat each integer three times
Input
5 12
Output
5 5 5 12 12 12
Custom separator
Input
7
Output
7-7
About the Duplicate Integers tool
Duplicate Integers is a free online tool that works entirely inside your web browser. Create multiple copies of the input integers. Because the processing happens on your own device, nothing you enter is uploaded, logged or stored anywhere.
This page is one of 133 Integer utilities on EditSafely. Each one does a single job well, and all of them follow the same rule: your input stays on your machine.
You can shape the output with 2 settings, including Repeat count and Separator, 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.
Because nothing leaves your device, the tool is suitable for sensitive content such as internal documents, credentials or customer data. It also responds instantly, since every keystroke is handled on your own machine rather than by a remote API.
Frequently asked questions
Does Duplicate Integers cost anything?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Is it safe to paste sensitive or confidential data?
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 much text can I process at once?
There is no fixed limit. Because the work happens on your own device rather than on a shared server, the practical ceiling is your machine's memory, which comfortably handles inputs far larger than typical online tools allow.
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.