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Number Formatter

by Adrian Ramon
Add thousands separators to numbers (12345678 → 12,345,678), using your Mac's number format or a style you choose.
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Unlisted Extension

This extension is published on Adrian Ramon's page but is not listed in the main directory index.

Readme

Number Formatter

Add thousands separators to numbers, in your Mac's number format or any of the common international styles.

Select 12345678.5 and click the button to get 12,345,678.5 (or 12.345.678,5, 12 345 678,5, 12’345’678.5, and so on, depending on the style you choose).

Styles

StyleExample
Same as my Mac (default)Follows System Settings › General › Language & Region › Number format
UK, US1,234,567.89
Germany, Italy1.234.567,89
France, Nordics1 234 567,89
SI, scientific1 234 567.89
Switzerland1’234’567.89
India (lakh)12,34,567.89

Space styles use a thin non-breaking space by default, so a number never splits across two lines. You can switch to a normal non-breaking space or an ordinary space in the options.

What it understands

  • Numbers that are already grouped in any of the styles above, so it also converts between them: 1.234.567,89 becomes 1,234,567.89.
  • Decimals are kept exactly as written, never rounded. Only the decimal mark changes to match the style.
  • Signs, currency symbols and units are left in place: -£1234567.50 becomes -£1,234,567.50.
  • Numbers inside longer text: "Revenue was 12345678 in 2025" becomes "Revenue was 12,345,678 in 2025".

How it decides what 1,234 means

A single comma or full stop followed by exactly three digits could be grouping or a decimal. If it already matches the style you chose, it is left alone. Otherwise it is read the way your Mac's number format reads it, so on a UK Mac 1,234 is one thousand two hundred and thirty-four, and 1.234 is one point two three four.

What it leaves alone inside text

Four-digit numbers on their own (usually years, such as 2025), numbers starting with 0 (phone numbers and codes), dates, times, ranges, version numbers, IP addresses, lists such as 1,2,3, and anything attached to letters, #, + or @. Select a number on its own to format it regardless.

Options

  • Number style: see the table above.
  • Space to use in space styles: thin non-breaking (default), non-breaking, or ordinary.
  • Leave four-digit numbers as 1234: follows the SI and many style guides, which group only numbers of five digits or more.
  • Plain click: replace the selection (default), copy the result, or show it in PopClip.
  • ⌥-click always replaces the selection, and ⇧-click always shows the result, as in Number to Words.

Privacy

Everything runs locally inside PopClip. No data is sent anywhere.

Author

Adrian Ramon.

Changelog

  • 1.0 (28 October 2026): first release.
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