Format phone numbers to international, national, and E.164 standards with country code detection.
Paste any phone number - spaced, hyphenated, parenthesized, or prefixed with a country code - and this tool returns it in three forms: E.164 (the +14155552671 style that most APIs require), international, and national. It identifies the country from the + prefix and applies that country's dialing conventions. The surprise most users hit: a number typed without a + prefix cannot be identified, so it is parsed under the tool's default country, and a UK number entered as 020 7946 0958 silently comes out as a US number. The digits stay in the browser; nothing is uploaded.
A concrete input and expected output from the current implementation.
Input
+1 (415) 555-2671
Expected output
E.164: +14155552671 International: +1 415 555 2671 National: (415) 555-2671
The +1 prefix selects the North American dialing plan, so the national form keeps the familiar (415) grouping while E.164 strips all punctuation and the international form groups digits with spaces.
A number starting with + is read against the standard country-code table, so +44 selects the UK dialing plan and +1 the North American one. Without the + prefix, the same digits mean different things in different countries, so the tool parses the number under a default country - taken from your locale or chosen in the interface - and shows which plan it applied. Check that label when the number came from somewhere unexpected.
E.164 is the ITU-T numbering standard: a + sign, the country code, and the national significant number, up to 15 digits with no spaces, hyphens, or parentheses. The leading zero used for national dialing (the trunk prefix, as in UK 020) is dropped because it only exists for calls made inside that country. Extensions have no place in E.164, so they are preserved only in the national and international forms.
Because the zero is a trunk prefix, not part of the international number: it signals national dialing inside the UK (020) or Germany (030) and disappears once the country code takes over, so 020 7946 0958 becomes +44 20 7946 0958. The zero never appears in E.164 output but does return in the national form. When in doubt, count digits - 15 is the ceiling.
The digits are identical, but the + carries meaning: it declares the number international and tells a dialer to use the international access prefix. 14155552671 dials fine within the North American plan but can misroute from other countries, while +1 415 555 2671 dials from anywhere. Prefer the + form in documents and code.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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