Check If an Integer Is Symmetric

The Check If an Integer Is Symmetric tool quickly tells you whether each number in your list is a palindrome. Just drop in a list of integers and it’ll instantly let you know which ones are symmetric that is, they read the same backward and forward.

You can paste numbers in manually or load them from a file. Each number is processed on its own line, so you can run batches all at once. Want to hide anything that isn’t symmetric? Flip the toggle. Need to ignore messy input like words or broken lines? That’s covered too.

The tool updates instantly in your browser. It doesn’t store or send anything anywhere, so it’s totally private and fast.

Paste your input above or import a file below.
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Supported file types: .txt, .csv, .tsv, .log, .json, .xml, .md, .ini, .yaml, .yml, .html, .htm, .css
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Options
Ignore non-integers
Only show symmetric
Maximize output

How to Use:

  • Input your integers line-by-line or use Choose File to import a text file
  • Toggle Ignore non-integers to skip lines that contain anything that’s not a valid number
  • Enable Only show symmetric to display only the palindromes (like 121 or 12321)
  • Toggle Maximize output to stretch the output textarea vertically for easier viewing
  • Click Check to process and update results
  • Use Copy Output or Export to File to save your results locally
  • Use Clear All to reset input, output, and settings

What Check If an Integer Is Symmetric can do:

This tool helps you identify numeric palindromes fast. Use it to clean data, validate patterns, or just explore interesting numbers. Turn on “Only show symmetric” to get a filtered list. Flip on “Ignore non-integers” for a clean scan. It works on any number of inputs and handles negatives correctly by ignoring the minus sign during comparison.

Example:

Before:

121
12321
123
888
101
22

After:

121 → Yes
12321 → Yes
123 → No
888 → Yes
101 → Yes
22 → Yes

Common Use Cases:

This tool is popular among programmers working with number puzzles, students exploring number properties, and data analysts validating pattern-based rules. Teachers use it to demonstrate symmetry in math class. Writers and game designers sometimes even use it to filter out palindromic numbers for puzzles or procedural generation. It’s also handy when reviewing user input, logs, or datasets that require symmetric number detection especially when paired with filters that skip bad input or clean results.

Useful Tools & Suggestions:

If you’re using Check If an Integer Is Symmetric, try Generate Symmetric Integers to quickly create more test cases. Or run Palindromize an Integer to force any number into a symmetric form and see how close it was to begin with.

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