Format numbers with separators, decimals or scientific notation.
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How to use Number Formatter
Open the Number Formatter tool.
Paste or type your number into the input field.
The output updates as you type. Adjust the options if you need a different format.
Copy the result, or share the URL to hand the exact input to someone else.
About Number Formatter
Format a number every common way at once: grouped with thousands separators, plain fixed decimals, USD and EUR currency, percent, compact (1.2M) and scientific notation. A decimals slider controls precision and uses your locale's conventions.
What people use it for
Add thousands separators to a large number.
Format a value as currency or a percentage.
Get compact (1.2K / 3.4M) or scientific notation.
Frequently asked questions
Which formats are produced?
Grouped, plain, USD, EUR, percent, compact and scientific, all from one input, with adjustable decimals.
Is it locale-aware?
Yes, it uses the Intl number formatter, so separators follow your locale.
Is it private?
Every calculation happens on this page, in your own browser. Your input is never sent to a server and never logged, which also means the tool keeps working when you are offline.