What number styles are supported?

Four styles are supported: Decimal (plain number), Currency (with currency symbol), Percent (the input value treated as a raw percentage, e.g., 75 → 75%), and Scientific (exponential notation like 1.23e+6).

How does the Currency style work?

When Currency style is selected, a currency dropdown appears. Choose a currency code (USD, EUR, GBP, JPY, KRW, CNY) and the Intl.NumberFormat API formats the number with the correct symbol and placement for the chosen locale. For example, 1234.5 in en-US with USD gives $1,234.50.

Why does the Percent style divide by 100?

The browser's Intl.NumberFormat percent style multiplies the input by 100 internally (0.75 → 75%). To keep the input intuitive (enter 75 to see 75%), this tool divides your input by 100 before passing it to the formatter.

What is the Grouping Separator toggle?

Most locales use a character to separate groups of thousands (e.g., 1,000,000 in en-US or 1.000.000 in de-DE). Turning off Use Grouping Separator removes these, useful when you want a plain number like 1000000.

Is this tool free and private?

Yes. Number formatting runs entirely in your browser using the built-in Intl.NumberFormat API — no data is sent to any server.

Number Formatter

Format numbers with locale-specific styles, currency, grouping separators, and decimal places using the Intl.NumberFormat API.

Number

Locale

Style

Decimal Places: 2

010

Use Grouping Separator

How to Use

Format numbers with locale-specific styles, currency, grouping separators, and decimal places using the Intl.NumberFormat API.

1Enter a number in the input field (e.g., 1234567.89).
2Select a locale from the dropdown to set the language and regional number style.
3Choose a formatting style: Decimal, Currency, Percent, or Scientific.
4If Currency is selected, pick a currency code (USD, EUR, GBP, etc.).
5Adjust decimal places with the slider and toggle the grouping separator, then copy the result.

Key Features

Supports 8 locales: en-US, en-GB, de-DE, ja-JP, zh-CN, ko-KR, fr-FR, es-ES
Four number styles: Decimal, Currency, Percent, Scientific (exponential)
Currency formatting with USD, EUR, GBP, JPY, KRW, CNY
Adjustable decimal places from 0 to 10
Toggle grouping separator on or off for cleaner output

Frequently Asked Questions

Learn More

Number Formatting Guide: Locale-Aware Numbers in JavaScript