.VCF File Extension Reference
VCF is the file extension for vCard, the universal plain-text format for contact information standardized by the IETF (vCard 4.0 in RFC 6350; vCard 3.0 in RFC 2426). Each contact is a block of human-readable text between BEGIN:VCARD and END:VCARD markers, with properties like FN (full name), TEL (phone), EMAIL, ADR (address), ORG, and PHOTO. A single .vcf file can contain one contact or hundreds — it is the format phones, email clients, and address books use to exchange contacts, and the format QR-code business cards encode. Because the content is plain text, you can preview it safely in any text editor before importing anything.
Quick Specification & Metadata
.VCF
Email & Comm
text/vcard
IETF (standards body); originally created by the Versit Consortium
N/A
Proprietary / Patent Licensed
Binary Header Data
1 KB – 5 MB
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What is a .VCF File? (Technical Definition & Architecture)
VCF is the file extension for vCard, the universal plain-text format for contact information standardized by the IETF (vCard 4.0 in RFC 6350; vCard 3.0 in RFC 2426). Each contact is a block of human-readable text between BEGIN:VCARD and END:VCARD markers, with properties like FN (full name), TEL (phone), EMAIL, ADR (address), ORG, and PHOTO. A single .vcf file can contain one contact or hundreds — it is the format phones, email clients, and address books use to exchange contacts, and the format QR-code business cards encode. Because the content is plain text, you can preview it safely in any text editor before importing anything.
Formatted byte alignment adhering to international format specifications.
Adheres to formal schema and protocol documentation.
Parsed and executed identically across Windows, macOS, and Linux kernels.
VCF Binary Structure & Header Specifications
The .VCF format organizes data into validated sequential or hierarchical byte structures. Inspecting the header offset reveals the magic byte sequence BEGIN:VCARD (Text marker).
- File Signature (Magic Bytes): BEGIN:VCARD (Text marker)
- MIME Content-Type: text/vcard
- Payload Structure: Optimized data stream with metadata headers and checksum records.
- Safety Classification: Medium Risk – A VCF is an address book — it can hold hundreds of people’s names, phone numbers, and emails. Uploading one to an untrusted online viewer hands all of that data to a stranger’s server. Preview and import VCF files locally, and treat unexpected ones like any unexpected attachment.
How to Open .VCF Files on Windows, Mac & Android
- 1Primary Application: Double-click or open directly with Google Contacts.
- 2Alternative Software: Open using Apple Contacts.
- 3File Association: Right-click the file, select Open with > Choose another app, and check Always use this app.
- 1Native macOS Application: Open with Google Contacts.
- 2Quick Look Preview: Highlight the file in Finder and tap the Spacebar.
- 3Set Default App: Press Cmd + I, expand Open with, select your application, and click Change All.
- 1Compatible Mobile Apps: Download a dedicated viewer for .vcf from the Google Play Store.
- 2Cloud Storage: Open through Google Drive, Dropbox, or OneDrive mobile apps.
- 3Online Browser Conversion: Use AnyFileX mobile browser tools to convert the file into universal PDF or image formats.
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.VCF MIME Types & HTTP Server Headers
When serving .vcf files over HTTP or configuring REST APIs, web servers must send the official IANA registered Content-Type headers:
| MIME Type Identifier | Standard Usage | File Extensions | Copy |
|---|---|---|---|
| text/vcard | Standard official MIME type for .vcf files | .vcf |
# Nginx mime.types
types {
text/vcard vcf;
}
# Apache .htaccess
AddType text/vcard .vcf.VCF Magic Bytes & Hex File Signatures
In digital forensics and file signature analysis, authentic .vcf files begin with a standardized magic byte sequence at byte offset 0x00 to verify file integrity and prevent extension spoofing:
Offset 0x00BEGIN:VCARD (TVCFEmail & Comm File Format.VCF vs .PDF (Detailed Format Comparison)
| Feature Metric | .VCF | Advantage | |
|---|---|---|---|
| Format Full Name | vCard Contact File | Portable Document Format | Tie / Equal |
| Category | Email & Comm | Documents | Tie / Equal |
| MIME Content-Type | text/vcard | application/pdf | Tie / Equal |
| Binary Header (Magic Bytes) | BEGIN:VCARD (Text marker) | 25 50 44 46 2D (%PDF-) | Tie / Equal |
| Typical Storage Footprint | 1 KB – 5 MB | 200 KB – 25 MB | Tie / Equal |
| Universal Native Support | High / OS Standard | High / OS Standard | Tie / Equal |
.VCF Compatibility Matrix
Supported natively or through Google Contacts
Supported natively or via Apple Contacts
Supported via open-source tools and command line utilities
Accessible through compatible mobile viewers or cloud previewers
Supported through dedicated mobile apps or cloud viewers
Accessible via web browser applications and Chrome extensions
Recommended Software for .VCF
Google Contacts
Google LLC
Apple Contacts
Apple Inc.
Mozilla Thunderbird
Mozilla Foundation
Common Errors & Troubleshooting .VCF Files
Security & Malware Risk Assessment
Can a .VCF file carry viruses or malware?
A VCF is an address book — it can hold hundreds of people’s names, phone numbers, and emails. Uploading one to an untrusted online viewer hands all of that data to a stranger’s server. Preview and import VCF files locally, and treat unexpected ones like any unexpected attachment.
May support scripting or automation macros
Safe to inspect with AnyFileX's browser sandbox
- •Verify file extension in OS File Explorer options ('Show known file extensions').
- •Verify magic bytes (BEGIN:VCARD (Text marker)) to ensure the file isn't a renamed executable.
- •Do not open .VCF attachments received unexpectedly via email or instant messenger.
Frequently Asked Questions
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