🔢 Number Formatter

How it works

• Locale formatting uses the browser's built-in Intl.NumberFormat API — no third-party library needed.
• Decimal: locale-aware thousands separators and decimal mark.
• Percent: multiplies the value by 100 and appends the locale's percent sign (e.g. 0.25 → 25%).
• Currency: formats as US dollars using the chosen locale's currency symbol placement and grouping rules.
• Scientific notation: Number.toExponential() — e.g. 1 234 567 → 1.2346e+6.
• SI prefix: scales the number to the nearest SI prefix (k, M, G, T …) for compact display.

All formatting runs locally in your browser using the JavaScript Intl API. No data is sent to any server.

• Decimal places range: 0 – 20 (browser limit for Intl.NumberFormat).
• Extremely large numbers beyond JavaScript's safe integer range (Number.MAX_SAFE_INTEGER ≈ 9 × 10¹⁵) lose precision — use BigInt tools for arbitrary precision.
• Locale support depends on your browser; uncommon locales may fall back to a default.
• Currency style is hardcoded to USD. Use another tool for multi-currency conversion.

• 1234567.89 in de-DE → 1.234.567,89
• 0.1575 as percent → 15.75%
• 1500000 with SI prefix → 1.50M
• 0.000000034 in scientific → 3.4000e-8
• 1234567 in hi-IN → 12,34,567