Number Formatter

Number Formatter is a free math & calculators tool that runs entirely in your browser — grouping, decimals, scientific. No upload, no account, no limits.

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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, never logged and never used for training — which also means the tool keeps working when you are offline.