Phone Number Formatter

What the Formatter Produces

This tool takes a phone number in almost any notation and returns it in three shapes, plus a validity verdict and a list of problems:

• National format — grouped the way people in that country normally write it.
• E.164 — the machine-readable form such as +14155552671.
• International display — the dial code followed by the grouped national number, such as +1 (415) 555-2671.

It also reports the detected country, dial code, the national number after the dial code is removed, and the digit count.

A phone number is not one string; it is a set of parts, and each audience wants a different arrangement. A local reader expects the national grouping and may include the trunk prefix. An international caller expects the country code and no trunk prefix. A machine expects E.164 with nothing but a plus, the dial code, and digits. The underlying number never changes, but dropping a separator or keeping a leading zero can turn a working string into one that an SMS gateway rejects. Converting between the three views by hand is where most mistakes creep in, which is the problem this page solves.

Auto-Detection vs Manual Country Selection

The behaviour depends entirely on whether the input starts with a plus sign.

If you type a leading +, the tool strips separators, compares the digits against every dial code, and takes the longest match. That is why +44... is read as the United Kingdom even though +4 is not itself a country code.

If there is no +, no guessing happens. You must choose a country from the dropdown, or the tool reports that it cannot determine one. This matters because the same digit string is valid in several countries — 612345678 is a normal French mobile and could look plausible elsewhere — so the page deliberately refuses to infer a country from a bare national number.

Country Rules at a Glance

The group patterns and accepted lengths are fixed per country:

Country	Code	National pattern	Accepted length
United States	+1	(XXX) XXX-XXXX	10
Canada	+1	(XXX) XXX-XXXX	10
China	+86	XXX XXXX XXXX	11
United Kingdom	+44	XXXX XXX XXX	10
Japan	+81	XX XXXX XXXX	10
South Korea	+82	XX XXXX XXXX	9–10
India	+91	XXXXX XXXXX	10
Germany	+49	XXX XXXXXXX	10–11
France	+33	X XX XX XX XX	9
Australia	+61	XX XXXX XXXX	9
Brazil	+55	XX XXXXX XXXX	10–11
Italy	+39	XXX XXX XXXX	9–10
Spain	+34	XXX XXX XXX	9
Mexico	+52	XX XXXX XXXX	10
Russia	+7	XXX XXX XX XX	10

Where the accepted length range is wider than the pattern, longer numbers pass validation but come back without grouping.

Worked Examples

US local number. Enter (415) 555-2671 and select United States. The result is national (415) 555-2671, E.164 +14155552671, and international +1 (415) 555-2671.

UK international number. Enter +442079460958. The plus triggers detection of +44, leaving the 10-digit national number 2079460958, grouped as 2079 460 958, with E.164 +442079460958 and international display +44 2079 460 958.

French mobile. Enter 612345678 and choose France. It is 9 digits, matching the French pattern, so it becomes 6 12 34 56 78 and E.164 +33612345678.

Limitations and False Positives

Validation here is a shape check, not a lookup. It confirms digit count and flags letters or stray symbols, but it cannot know whether a number is allocated, ported, or active. A number that passes can still be disconnected, and a real number can fail if it uses an uncommon valid format.

Two more limits are worth remembering. The trunk prefix problem affects countries that write a leading zero nationally, such as the UK, France, Germany, and Italy; you must remove it before the length check and E.164 conversion. And shared country codes collide: because the detector returns the first match of a given length, +1 always resolves to the United States and never Canada. Pick the country manually when you need the right label.

Cleaning a Phone List in Practice

When you paste a column of numbers from a spreadsheet, the most common fixes are mechanical. Strip everything that is not a digit or a leading plus, remove national trunk zeros, and then check lengths against the country rules above. Numbers that fail are usually one digit short, carrying an unexpected extension, or written with a domestic prefix such as 1- before a US area code. Decide once how you will represent each country, convert the whole column through that format, and spot-check the first and last rows. Keeping a single canonical E.164 form in storage and formatting only at display time prevents the same number appearing twice in a customer record.

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