Duplicate Integer Digits

Duplicate Integer Digits takes any list of integers and repeats each digit as many times as you want. Want to double everything? Triple it? You decide. For example, 123 becomes 112233 if you’re duplicating twice. You can keep negative signs, clean out non-digit characters, and even import files all without leaving your browser.

It updates live as you type or change settings, flashes the output so you know it worked, and includes quick options to copy, export, or reset. Perfect for formatting experiments, obfuscation, teaching, or just playing with numbers.

Paste your input above or import a file below.
No file chosen
Supported file types: .txt, .csv, .tsv, .log, .json, .xml, .md, .ini, .yaml, .yml, .html, .htm, .css
Total characters: 0
Options
Preserve sign
Remove non-digits
Maximize output

How to Use:

  • Paste your numbers into the Input Integers box.
  • Or click Choose File to import a .txt, .csv, or other plain-text file.
  • Set how many times to repeat each digit (e.g., 2 to double, 3 to triple).
  • Use the toggles:
    • Preserve sign: Keeps negative signs (-) in the output.
    • Remove non-digits: Strips letters, punctuation, etc.
    • Maximize output: Expands the output box if you’re working with long results.
  • The output updates live no button click needed.
  • Click Copy Output to copy it all.
  • Click Export to File to save the result.
  • Click Clear All to reset everything, including repeat count and file input.

What Duplicate Integer Digits can do:

  • Repeat every digit in your integers any number of times (1–10).
  • Retain minus signs or clean them out, depending on your goal.
  • Strip out any non-numeric characters if needed.
  • Accept large inputs via paste or file upload fully local and secure.
  • Instantly preview results with flashing border and output counter.
  • Easily export or copy the result for use in other tools.
  • All changes happen live no reloading, no uploading.

Example:

Input:

203
-547
9810

Repeat count: 2 Preserve sign: on Remove non-digits: off

Output:

220033
-554477
99881100

Common Use Cases:

Use Duplicate Integer Digits when you need to stylize, stretch, or obfuscate numeric data whether you’re generating fake input for testing, formatting digits for educational exercises, or just playing around. It’s also great for understanding how digit manipulation affects numeric structure.

Useful Tools & Suggestions:

After using Duplicate Integer Digits, try Shuffle Integer Digits to mix up the repeated digits and see how the number transforms. Or go with Make Integers Digits Fuzzy if you want to introduce a little randomness into those patterns.

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