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 — Add / Remove Commas in Numbers

How to Use thousands-separator

Paste or enter your input into the text field.
Configure any options (format, delimiter, encoding, or mode) using the controls above the output.
The result updates instantly — no submit button required for most operations.
Click Copy or Download to take the output to your next step.

Add or remove thousands separators from numbers — comma, space, underscore, period. Completely free and browser-only: your data never leaves your device, no uploads involved.

How thousands-separator Works

thousands-separator is a browser-side numbers utility built for speed and simplicity. Paste your input and the result appears within milliseconds. The tool handles edge cases — empty inputs, special characters, large datasets — without crashing or producing silent incorrect output. If you need a related operation, check the Related Tools section below.

Accepts large inputs — no size limits imposed by this tool
Handles edge cases: empty fields, special characters, and Unicode
Copy-to-clipboard and file download for every output
Works on Chrome, Firefox, Safari, and Edge without any extensions

Frequently Asked Questions

What does thousands-separator do?

thousands-separator add or remove thousands separators from numbers — comma, space, underscore, period. Results appear immediately — no page reloads, no waiting for a server response.

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.

Explore the full suite of Numbers tools and 290+ other free utilities at Chunky Munster.

Thousands Separator online

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