Add Commas to Integers

Format integers with thousands separators instantly. Supports US standard commas, European dots, SI spaces, code underscores, and Indian Lakhs and Crores grouping.

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How to Use Add Commas to Integers

1
Enter Integers
Paste raw numbers (e.g. 1000000) or text containing numbers into the input area.
2
Select Delimiter Style
Pick your desired formatting standard: Comma (1,234,567), European Dot, Space, or Indian System.
3
Copy Formatted Numbers
Cleanly formatted numbers with thousands separators are generated instantly.

Key Features

Global Numbering Systems
Supports standard commas, European dots, SI spaces, Swiss apostrophes, and Indian Lakhs/Crores.
Arbitrary Precision
Powered by BigInt and string chunking to format numbers with hundreds of digits without truncation.
Multiline & Text Support
Formats columns of integers or finds and formats long number strings inside sentences.
Client-Side Privacy
Runs completely locally in your browser with zero network calls.

Common Use Cases

  • Formatting financial balances, accounting reports, and bank ledgers.
  • Preparing large numbers for readability in publications and presentations.
  • Formatting Indian currency values in standard Lakhs (1,00,000) and Crores (1,00,00,000).
  • Adding numeric underscores for code readability in Python, Rust, and JavaScript.

Frequently Asked Questions

In India and South Asia, numbers are grouped into the first 3 digits from the right, followed by groups of 2 digits (e.g., 10,00,000 for 10 Lakhs).

Yes! The formatter automatically strips existing periods, commas, or spaces before reapplying your chosen style.

Yes, negative integers are recognized and preserve their leading minus sign (e.g., -1,234,567).

Numbers to Words
Spell out numbers in English: 42 → "forty-two". Supports large numbers.
Words to Numbers
Convert English number words like "forty-two" to digits: 42.
Calculate Number Sum
Paste a list of numbers and instantly get their sum, average, min and max.
Enumerate Integers
Add sequential numbers to the start of each line in a list.
Reverse Integer Digits
Reverse the digit order of an integer: 12345 → 54321.