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Number Formatter

Format numbers with thousands separators, currency, percent, scientific notation and more. Batch-convert multiple lines, all in your browser.

Last updated: 2026/10/16 Developer Feedback & bug reports
Input (one number per line)
Result

How to Use

1

Enter Numbers

Type one number per line, or paste them in. Numbers that already contain commas can be pasted as-is.

2

Choose a Format

Pick a display format such as currency, percent, scientific, or kanji, then set decimal places, rounding, and grouping.

3

Copy the Result

The formatted output updates in real time. Use the copy button to copy everything at once.

About the Number Formatter

A web tool that formats numbers with thousands separators (commas), fixed decimal places, currency, percent, scientific notation, or Japanese kanji numerals. It can also strip separators to return raw numbers. Multiple lines are converted at once, and everything runs in your browser, so your data is never sent to a server.

Features

  • Versatile FormattingSeparators, currency, percent, scientific notation, and kanji, all powered by Intl.NumberFormat.
  • Batch ConversionPut one number per line to convert them all at once. Great for pasting columns from a spreadsheet.
  • Rounding & StrippingRound half up, ceil, or floor, or strip commas to extract plain numbers.
  • Privacy FirstAll processing happens in your browser. Your numbers are never sent to a server.

Use Cases

  • Format amounts and sales data with currency and commas
  • Convert numbers into kanji numerals for documents
  • Turn ratios into percentages instantly
  • Round decimals with half-up, ceil, or floor
  • Strip commas to reuse numbers in CSV or calculations

FAQ

Is the number formatter free to use?
Yes, it is completely free with no registration. Your numbers are never sent to a server; everything is processed in your browser.
How far does kanji conversion go?
It supports the units man (10^4), oku (10^8), cho (10^12), and kei (10^16). Decimal parts are converted digit by digit after a "ten" mark, and negatives are prefixed with "mainasu".
How is percent calculated?
The input value is multiplied by 100 and a % sign is added, so 0.25 becomes 25%. If you already have a percent value like 25, use the plain format and add % yourself.
Can I convert many numbers at once?
Yes. Put one number per line and every line is converted with the same settings. You can paste a spreadsheet column directly.
What does "strip separators" do?
It removes commas, currency symbols, and spaces to leave a plain number you can use in calculations or CSV, turning "1,234,567" back into "1234567".

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