Phone Number Formatter
Format phone numbers to E.164, international, national, and RFC 3966 tel: formats for 45+ countries with auto country detection. 100% client-side.
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What is Phone Number Formatter?
A Phone Number Formatter that converts any phone number into the four standard formats: E.164 (+6621234567), international (+66 2 123 4567), national (02 123 4567), and RFC 3966 tel: links. It supports 45+ countries with dial codes, trunk prefixes, and national number length validation, and runs entirely in your browser.
Key Benefits
- Standardize messy numbers for CRM, spreadsheets, and databases
- Auto-detect the country from any +prefixed number
- Validate number length against per-country rules
- Generate click-to-call tel: links instantly
- No data leaves the browser — 100% client-side
Common Use Cases
- •Cleaning imported contact lists before loading them into a CRM
- •Normalizing user-entered phone numbers in forms
- •Generating tel: links for websites and email signatures
- •Validating phone number lengths for QA test data
How to Use the Phone Number Formatter
- Enter the phone number: Type or paste the number, e.g. +66 2 123 4567 or 081 234 5678.
- Choose the country: Keep Auto-detect for +prefixed numbers, or pick a country for national-format input.
- Review the formats: The tool shows E.164, international, national, and RFC 3966 tel: link with validity checks.
- Copy the format you need: Click the copy button next to each format to grab it for your CRM, database, or HTML.
Key Features
- E.164 (+6621234567), international, national, and RFC 3966 tel: output at once
- 45+ countries with dial codes, trunk prefixes, and NSN length validation
- Auto-detection from +dial prefixes using longest-match selection
- Handles 00 international prefix and national trunk zeros (e.g. Thai 0)
- One-click copy for every format
- 100% client-side — no phone number ever leaves the browser
Frequently Asked Questions
What is the E.164 format?
E.164 is the ITU-T international standard for phone numbers: a plus sign followed by the country code and subscriber number, up to 15 digits total, with no spaces or symbols — for example +6621234567.
What is an RFC 3966 tel: link?
RFC 3966 defines the tel: URI scheme used for click-to-call links. The number uses hyphens instead of spaces, e.g. tel:+66-2-123-4567, and can be used directly in href attributes.
Why does the national format keep the leading zero?
Many countries use a trunk prefix (0) that is dropped when dialing internationally. The national format restores it for local dialing — for example +66 2 123 4567 becomes 02 123 4567 in Thailand.
Does this tool validate whether a number is real?
No. It validates structure only: dial code, trunk prefix handling, and national number length per country. It cannot tell whether the number is actually assigned or reachable.