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Category File Converters

1 Upload CSV

2 Map Fields

3 Download VCF

Drag & Drop CSV File

or click to browse your computer

Privacy Notice: Processing is 100% Client-Side. Your data never leaves this browser.

Field Mapping

Match your CSV columns to vCard properties. We've auto-suggested matches based on your headers.

vCard Version:

CSV Header	Sample Data (Row 1)	Target vCard Field

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About

Converting contact lists from spreadsheets to mobile devices is a critical task for data migration, yet it remains fraught with technical pitfalls. The CSV to VCF Converter is an enterprise-grade utility designed to bridge the gap between tabular data (Excel, Google Sheets) and hierarchical contact standards (RFC 6350). Unlike server-based alternatives, this tool operates exclusively within your browser, ensuring that sensitive personal data - phone numbers, emails, and physical addresses - never traverses the network.

Accuracy in contact migration relies on precise field mapping and character encoding. A single misaligned delimiter or an unhandled UTF-8 byte sequence can render an entire address book importable but illegible. This tool implements strict adherence to vCard 3.0 and vCard 4.0 specifications, handling complex edge cases such as multi-line notes, quoted-printable encoding for legacy systems, and international character sets.

The system utilizes a Levenshtein distance algorithm (L) to intelligently predict column mappings, reducing the manual effort required to link headers like Cell_Num to the standard TEL;TYPE=CELL property. Whether migrating 50 or 5,000 contacts, this utility ensures data integrity from source to destination.

Formulas

The core of the auto-mapping feature relies on the Levenshtein Distance algorithm, which calculates the minimum number of single-character edits required to change one word into another. This allows the system to recognize that Phone_Cell is semantically close to Cell Phone.

{

lev(a, b) = |a| if |b| = 0lev(a, b) = |b| if |a| = 0lev(tail(a), tail(b)) if a[0] = b[0]

When generating the VCF file, strict line folding is applied to ensure compatibility with older devices. Lines longer than 75 octets are split and indented.

Folded Line = Line[0:75] + CRLF + SPACE + Line[75:...]

Reference Data

CSV Header Variation (Input)	Target vCard Property	vCard Syntax Example	Description
First Name, FName, Given Name	N (Name)	N:Doe;John;;;	Structured name field. Order: Family, Given, Middle, Prefix, Suffix.
Mobile, Cell, Handphone	TEL;TYPE=CELL	TEL;TYPE=CELL:+15550199	Mobile telephone number. Should ideally be E.164 formatted.
Email, E-mail, Mail Address	EMAIL	EMAIL;TYPE=INTERNET:[email protected]	Standard internet email address.
Organization, Company, Firm	ORG	ORG:Acme Corp;Dept of Science	The organization and optionally the department/unit.
Address, Street, City	ADR	ADR;TYPE=HOME:;;123 Main St;City;...	Structured address. Requires semicolon delimiters for parts.
Website, URL, Homepage	URL	URL:https://example.com	Associated website link.
Notes, Remarks, Description	NOTE	NOTE:Met at conference...	Free-form text. Newlines must be escaped as \n.
Birthday, DOB	BDAY	BDAY:1990-12-31	Date of birth in ISO 8601 format (YYYY-MM-DD).

Frequently Asked Questions

This is usually a character encoding issue. CSV files from Excel are often saved as Windows-1252 or ASCII, while mobile devices expect UTF-8. Our tool automatically attempts to detect UTF-8, but ensure your original CSV is saved with "UTF-8 encoding" for best results with international characters.

vCard 3.0 is the most widely supported format, compatible with almost all iOS (iPhone) and Android versions, as well as Outlook and Gmail. vCard 4.0 is the newer standard (RFC 6350) which handles modern fields better but may not be supported by older legacy dialer apps. We recommend 3.0 for maximum compatibility.

Yes. Since the processing happens entirely in your browser using JavaScript, the limit depends on your device's memory (RAM), not a server limit. Modern browsers can easily handle lists of 5,000 to 10,000 contacts. For extremely large lists, the "Preview" generation might take a few seconds.

The vCard address field (ADR) is structured (PO Box, Extended, Street, City, Region, Zip, Country). If your CSV has a single column for "Full Address", map it to the "Street Address" component, or ideally, split your CSV columns before uploading for a cleaner import.

Absolutely. This tool is built with a "Privacy-First" architecture. No file you upload is ever sent to a server. The conversion logic runs locally on your device, meaning your private contact list never leaves your control.