What is a thousands separator?

A thousands separator is a character inserted every three digits in large numbers to improve readability. Different countries use different separators: the UK and US use commas (1,000,000), continental Europe uses periods or spaces (1.000.000 or 1 000 000).

What separator does Python use for large numbers?

Python (3.6+) supports underscores as digit separators in numeric literals: 1_000_000. This is purely syntactic and has no effect on the value.

Thousands Separator - Free Online Number Formatter Tool

How to Use thousands-separator

Type or paste a number (or a list of numbers, one per line) into the input field.
Adjust any available options shown - the output updates as you type.
The result updates instantly - no submit button required for most operations.
Click Copy or Download to take the output to your next step.

Thousands Separator allows you to add or remove formatting from large numbers instantly. Whether you need to insert a comma every three digits for financial reports or strip underscores from code literals, this online number formatter handles it all. It supports multiple grouping symbols, including space, period, and apostrophe, ensuring compatibility with international numbering standards.

Advanced Number Formatting Features

This digit grouping tool is built for speed and simplicity. Paste your dataset and the result appears within milliseconds. The utility is particularly useful for preparing data for spreadsheets, cleaning up log files, or formatting currency values for display. It handles edge cases like decimal points and negative signs without breaking the numeric structure.

Add or remove thousands separators (comma, space, underscore, period)
Customizable decimal separator for international locales
Bulk process multiple numbers at once
100% client-side - your numeric data stays in your browser

Frequently Asked Questions

What does thousands-separator do?

thousands-separator add or remove thousands separators from numbers - comma, space, underscore, period.

What input does thousands-separator accept?

Paste text directly into the input field, or type your data. Most operations handle Unicode, special characters, and multi-line inputs without issue.

How large an input can I process?

There is no hard limit imposed by this tool. Very large inputs (multi-MB text) process within your browser's available memory. For files larger than 50 MB, a command-line tool may be faster.

Can I download the output?

Yes - every output panel includes a Copy to Clipboard button and a Download as file option. Outputs are saved as plain text or the appropriate file format for the operation.

Whether you are cleaning up a ledger or formatting a long list of ID numbers, this free online thousands separator tool gives you clean, formatted results instantly.

Thousands Separator online

Add or remove thousands separators from numbers - comma, space, underscore, period - runs in your browser