Replace Integer Digits

Replace Integer Digits takes any list of numbers and swaps out specific digits for whatever character you choose. Whether you’re obfuscating data, cleaning up formatting, or just experimenting, this tool makes it quick and visual. It works live in your browser no delays, no reloads.

You choose the digit to replace, what to replace it with, and how strict the tool should be about valid input. Then just paste your numbers and see it work instantly.

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 items: 0
Options
Ignore non-integers
Replace all matches
Maximize output

How to Use:

  • Paste or type integers into the Input Integers box one per line is ideal, but spaces and commas are fine too.
  • Use the fields in the Options box to set:
    • Digit to replace – Any digit from 0 to 9.
    • Replace with – Any character (letter, symbol, digit).
  • Use the toggle switches:
    • Ignore non-integers – Skips lines like “abc” or “1a2”.
    • Replace all matches – Replaces every occurrence, not just the first.
    • Maximize output – Expands the output box.
  • Output updates live as you type or change settings.
  • Click Copy Output to copy your transformed list.
  • Use Export to File to save the result.
  • Hit Clear All to reset everything instantly.
  • You can also import a text file under the input box if you want to work with saved data.

What Replace Integer Digits can do:

This tool helps you quickly modify numeric data without needing formulas or code. You can swap out digits with letters, symbols, or other numbers useful for testing, masking, formatting, or learning.

It’s especially handy if you want to anonymize numeric strings, visually differentiate values, or simulate digit-based encoding. And you stay in full control: decide what gets replaced, where, and how strictly the list is filtered.

Everything updates live. Nothing leaves your browser. No extra clicks required.

Example:

Input:

105
309
512
998

Options:

  • Replace digit: 1
  • Replace with: x
  • Replace all: On

Output:

x05
309
5x2
998

Common Use Cases:

Use it to quickly test obfuscation strategies, reformat numbers for regex or pattern tests, or clean sensitive digits from data samples. It’s also great for educational tasks where you need to highlight or replace specific digits in math exercises or logic puzzles.

Useful Tools & Suggestions:

After using Replace Integer Digits, try Delete Integer Digits if you want to remove specific digits instead of swapping them. Or go with Highlight Integers to quickly spot where the changes occurred across your input.

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