.adr — Address Book
Various (VCF standard) · 1996
An ADR file is a digital contact card format used to store and share personal or business contact information like names, phone numbers, and addresses.
Key Features
- Stores comprehensive contact details (name, phone, email, address, etc.).
- Plain text format, easily editable with basic text editors.
- Standardized vCard (VCF) compatibility for cross-platform use.
- Can be imported/exported between various contact management applications and devices.
Best For
- Exchanging contact information between different apps and devices.
- Storing detailed contact profiles.
- Archiving your contact lists.
- Creating portable contact backups.
Less Ideal For
- Storing multimedia files like photos or videos.
- Complex data relationships beyond contact information.
- Rich text formatting or styling within contact entries.
- Securely encrypted contact storage without additional measures.
Common Use Cases
- Exporting contacts from an old phone or software.
- Sharing contact details with others.
- Creating backups of your contact list.
- Importing contacts into new devices or applications.
- Managing business contact information.
How to Open It
- Double-click the file; your operating system might automatically open it with a default contact application (like Windows Contacts or macOS Contacts).
- Open your preferred contact management software (e.g., Microsoft Outlook, Google Contacts, Apple Contacts) and use its import function, selecting the ADR/VCF file.
- Open the file in a plain text editor (like Notepad on Windows or TextEdit on macOS) to view the raw contact data.
What is a .adr file?
An ADR file, often associated with the .vcf (vCard) format, is a plain text file designed to store contact information. This includes details like names, phone numbers, email addresses, physical addresses, and sometimes even company affiliations or job titles. It's a standardized format, meaning contact information can be easily shared and imported across different applications and devices. Think of it as a digital business card that can hold more data than a physical one and can travel with you anywhere.
Programs That Open .adr Files
| Platform | Program | ||
|---|---|---|---|
| Windows | Microsoft Outlook | Paid | Official |
| Windows Contacts | Free | Official | |
| Notepad | Free | Official | |
| macOS | Apple Contacts | Free | Official |
| TextEdit | Free | Official | |
| Linux | Evolution | Free | |
| Thunderbird | Free | ||
| Android | Google Contacts | Free | Official |
| Contacts+ (Third-party apps) | Free | ||
| iOS | Apple Contacts | Free | Official |
| Web Browser | Google Contacts | Free | Official |
| Outlook.com Contacts | Free | Official |
How to Convert .adr Files
| Format | Method |
|---|---|
| .CSV | Export from contact manager, Online converters |
| .JSON | Programming scripts, Online converters |
Common Problems with .adr Files
Frequently Asked Questions
Often, there is no significant difference. '.adr' is sometimes used as an extension for files containing address book information, but they are almost always structured as '.vcf' (vCard) files, which is the industry standard.
Standard vCard (ADR) files are designed for text-based contact information. While some advanced implementations or proprietary versions might support embedding limited image data (like a small photo icon), it's not a primary or universally supported feature.
As a plain text file, an ADR file is not inherently secure. Anyone with access to the file can read its contents. For sensitive contact information, consider storing it within a secure application or encrypting the file itself.
Technical Details
ADR files are typically plain text files adhering to the vCard (VCF) standard, which is managed by the Internet Mail Consortium. Each piece of contact information is represented by a specific tag (e.g., N: for name, TEL: for telephone) on a new line. The format is human-readable and can be easily parsed by software.