Number Formatter — Free Online Tool
Format any number using the Intl.NumberFormat API with full control over style (decimal, currency, percent, compact, scientific, engineering, unit), locale (12 built-in BCP 47 options), fraction digits, grouping separators, and sign display. Shows formatted output across 6 locales simultaneously for quick cross-regional comparison.
100% client-side. No uploads. Your data never leaves your browser.
How to use Number Formatter
- Enter a number in the input field.
- Select a style: decimal, currency, percent, compact, or scientific.
- Choose a locale from the dropdown.
- See the formatted value and compare across 6 locales.
Frequently Asked Questions
What is compact notation?
Compact notation abbreviates large numbers: 1,200,000 becomes 1.2M in en-US, or 120万 in ja-JP. Useful for dashboards and data visualizations.
What locales are supported?
12 built-in options: en-US, en-GB, de-DE, fr-FR, es-ES, ja-JP, zh-CN, ar-SA, hi-IN, pt-BR, ru-RU, ko-KR. You can also type any BCP 47 locale tag directly.
What is engineering notation?
Like scientific notation but the exponent is always a multiple of 3 (matching the SI prefix scale — thousands, millions, billions). 1,234,000 = 1.234E+6 in scientific, 1.234×10³×10³ in engineering.
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