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What is ICS File Extension?

Understanding iCalendar Format


Overview – What is ICS File Extension

Many organizations use different applications for the continuation of their work which includes the usage of Calendar as well. These calendar files are known as ICS file, which is a widely used format for storage of calendars.

ICS file is supported by various calendar or email applications. This email programs includes Google Calendar, Microsoft and Apple iCal.

With the help of these mentioned files users can publish essential information from the calendars to the World Wide Web in a direct way.

Application Category

Calendar data exchange file

Introduced By

Apple Inc.

Specification

RFC 2445

More Facts about .ICS file Format

Full form of ICS file is “iCalendar”. It is a type of exchange calendar data file that can be accessed by different applications like Google Calendar, IBM Notes, Yahoo! Calendar, eM Client, etc.

Data Storage

The Calendar information, which is stored in ICS files consists of the information such as start time, end time, the title, and summary for the calendar event. Canceling and updating an event is also supported while using ICS file format.

Migration Support

Includes the option to migrate the file of ICS calendar to CSV for use in a spreadsheet program.

The specifications are defined in RFC 2445 for ICS file format.

Technical Specifications

MIME Type

Standard Identifier text/calendar

Official media type for iCalendar data transmission.

File Signature Details

Hexadecimal Signature 42 45 47 49 4E 3A

Standard "BEGIN:" header for calendar objects.

Default location of iCalendar file format is not defined.

Applications Supported

Google Calendar
Apple Calendar
MS Outlook (Partial)
Yahoo! Calendar
Mozilla Thunderbird
IBM Lotus Notes
eM Client
SeaMonkey
Evolution
How to Open and View ICS file

The ICS File can be opened using two methods:

Google iCalendar App or Desktop Application
Using a specialized free viewing tool
Tools that open ICS File Extension

SysTools ICS Viewer

Professional ICS Viewer


Official Tool View Tool

Freeware ICS Viewer

Free Viewer


Official Tool View Tool
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