Duplicate Integer Digits
Repeat every digit of an integer a chosen number of times. Runs entirely in your browser, so your data never leaves your device.
0 chars · 0 lines
Output
The result appears here as you type.
How to use Duplicate Integer Digits
- 1. Paste the integers. Enter one or more integers, one per line. Every digit within each integer is repeated the same number of times.
- 2. Set how many times to repeat each digit. Enter a value in Repeat each digit to control the duplication count. A value of 2 doubles every digit, so 12 becomes 1122, while a higher value repeats each digit further.
- 3. Copy the expanded integers. Copy the resulting numbers, now with every digit duplicated, and paste them wherever this digit-expanded form is needed, such as a puzzle or a formatting experiment.
When to use Duplicate Integer Digits
Duplicate Integer Digits repeats every digit of a number a chosen number of times, so 12 becomes 1122 when doubled. It operates at the digit level, unlike duplicating a whole number, and is mostly useful for puzzles, formatting tricks and pattern generation.
- Solving a digit-duplication puzzle. A puzzle defines a transformation where every digit of a number repeats a set number of times. Test candidate inputs here to see what the transformed value looks like.
- Generating a padded or stretched-looking code. A design mockup wants a numeric code to look visually longer or bolder by duplicating each digit, without changing the underlying sequence of values.
- Building test cases for a digit-processing function. You are writing code that expands or repeats individual digits of a number and want reference outputs for a handful of test integers to check your implementation.
- Exploring digit-level string transformations. A coding exercise on transforming a number's digit sequence uses digit duplication as one example operation among several to demonstrate on sample numbers.
Examples
Double every digit
Input
12 305
Output
1122 330055
The sign is kept
Input
-40
Output
-4400
About the Duplicate Integer Digits tool
Duplicate Integer Digits is a free online tool that works entirely inside your web browser. Repeat every digit of an integer a chosen number of times. 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 the Repeat each digit setting, and the result refreshes the moment you change it. 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 Integer Digits 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.