Palindromize an Integer

The Palindromize an Integer tool takes each integer in your list and mirrors its digits to create a numeric palindrome. A palindrome reads the same forward and backward and with this tool, you can generate them automatically using different styles.

Whether you want symmetric numeric patterns, stylized sequences, or fun transformations, this tool makes it simple. It works instantly in your browser with live updates.

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 processed: 0
Options

Ignore non-integers
Maximize output

How to Use:

  • Paste integers (one per line) into the Input Integers box
  • Or use Choose File to import a .txt, .csv, or other plain-text file
  • Use the Mirror style dropdown to choose how the palindrome is formed:
    • Append reverse: 123 → 123321
    • Reflect tail: 123 → 12321
    • Append reversed: behaves like Reflect tail
  • Toggle Ignore non-integers to skip or include invalid input lines
  • Enable Maximize output to expand the output box
  • Click Palindromize or just start typing the output updates automatically
  • Use Copy Output or Export to File to save results
  • Click Clear All to reset the input and settings

What Palindromize an Integer can do:

This tool mirrors the digits of each number to form palindromes. Negative numbers are preserved, and output reflects the original line order. Choose from styles that mirror all digits, mirror excluding the last digit, or reflect tail-first for classic palindromes.

Example:

Input:

123
45
9

Mirror style: Reflect tail

Output:

12321
454
9

Common Use Cases:

Use this tool to generate symmetric number patterns, numeric puzzles, challenge codes, or visual effects. Great for educators, game devs, and anyone working with structured number lists or creative transformations.

Useful Tools & Suggestions:

After using Palindromize an Integer, try Check If an Integer Is a Palindrome to verify the result or test other numbers. And if you want a text-based version of the same idea, Create a Palindrome works with words and phrases instead of digits.

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