Add Commas to Numbers
Automatically add thousands separators to every number in your text. Supports US, UK, and European formats.
Number Format
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Everything You Need to Format Numbers
Any Number in Text
Finds and formats every number embedded in your text, regardless of context — sentences, tables, CSV data, code snippets.
US & European Formats
Choose between US/UK comma style (1,000,000.50) or European period style (1.000.000,50).
Decimal Support
Decimal portions are preserved correctly. 9999.99 becomes 9,999.99 in US format.
Real-Time Preview
Output updates instantly as you type — no button needed.
Copy Instantly
One click copies the entire formatted output to your clipboard.
100% Private
All processing is done in your browser. No text is ever uploaded or stored.
How to Add Commas to Numbers
Paste your text
Paste any content that contains unformatted numbers — articles, reports, data exports, spreadsheet pastes.
Choose format style
Pick US/UK (commas as thousands separator) or European (periods as separator).
See results instantly
Every number in the text is formatted with the correct separator as you type.
Copy and use
Click Copy and paste the formatted text wherever you need it.
Frequently Asked Questions
What numbers does it format?
Any standalone number in the text including integers and decimals. Numbers already containing commas or periods are processed based on the selected format.
Does it handle decimal numbers?
Yes. Decimals are preserved. 12345.67 becomes 12,345.67 in US format and 12.345,67 in European format.
What is European format?
European format uses a period as the thousands separator and a comma as the decimal point. For example: 1.000.000,50 instead of 1,000,000.50.
Can I use it on spreadsheet data?
Yes. Paste CSV or tab-separated data and all numbers in it will be formatted. The surrounding text and structure are preserved.
Will it change numbers already formatted?
Yes — it re-formats any number it finds. If your text already has commas in numbers, paste it after clearing previous formatting.
Is my text uploaded to a server?
No. All processing runs locally in your browser. Nothing is uploaded or stored.