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CSV to ICS Calendar Converter Online Free
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ICS Calendar File Format
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Transform your events spreadsheet into an iCalendar file for import to Google Calendar, Outlook, or Apple Calendar.
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How to Convert CSV → ICS
1
Prepare your CSV
Ensure your CSV has columns for Subject, Start Date, Start Time, End Date, End Time
2
Upload and Configure
Upload Calendar Events CSV CSV and choose ICS Calendar Events (.ics) format
3
Preview and Download
Review converted data, download Calendar-ready file
4
Import to your calendar
Open the .ics file, or import via Google Calendar (Settings → Import), Outlook (File → Import), or Apple Calendar (File → Import)
Output is in ICS Calendar File format — ready to import directly, no manual reformatting needed.
CSV → ICS Conversion Questions
What CSV columns does the tool recognize?
The tool recognizes Subject/Title, Start Date, Start Time, End Date, End Time, All Day Event, Location, Description, Category, Private, Status, Organizer, and Reminder columns. It also recognizes common aliases for each field.
Can I import the ICS file to Google Calendar?
Yes. In Google Calendar, click the gear icon, go to Settings, then Import & Export, and upload the ICS file. All events will be added to your selected calendar.
Does it support all-day events?
Yes. Events are marked as all-day if the All Day column is TRUE, or if no start time is provided. All-day events use DATE-only format per the ICS standard.
Why Convert CSV to ICS?
The Import Problem
Google Calendar, Outlook, and Apple Calendar use iCalendar ICS format for importing events. CSV spreadsheets cannot be directly imported without conversion to ICS first.
What This Tool Does
Upload your events CSV or Excel file. The tool maps your columns to iCalendar properties and generates an RFC 5545 compliant ICS file ready for import to any calendar app.
Smart Column Detection
Automatically recognizes common column names like Subject, Start Date, Start Time, End Date, Location, and Description from any spreadsheet source.
Your CSV → ICS Conversion is Secure
No Data Retention
Nothing is stored after conversion. Close the tab and your data is gone.
GDPR Compliant
Full EU data protection compliance. Your privacy rights are fully protected.
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Field Mapping
How Calendar Csv fields map to Calendar Ics
| Calendar Csv | Source Value | Calendar Ics | Target Value | Note | |
|---|---|---|---|---|---|
Subject |
Team Meeting |
→ | SUMMARY |
|
Event title |
All Day Event |
FALSE |
→ | DTSTART;VALUE=DATE |
|
Date-only format for all-day events |
Location |
Conference Room A |
→ | LOCATION |
|
Event location |
Description |
Weekly team sync meeting |
→ | DESCRIPTION |
|
Event description with escaped newlines |
Category |
Meeting |
→ | CATEGORIES |
|
Event category |
Private |
FALSE |
→ | CLASS |
|
PRIVATE or PUBLIC |
Status |
Confirmed |
→ | STATUS |
|
CONFIRMED, TENTATIVE, or CANCELLED |
Organizer |
jane@example.com |
→ | ORGANIZER |
|
Organizer mailto: URI |
Why Use the CSV → ICS Converter?
Universal Column Detection
Automatically recognizes event column names from any CSV or Excel source.
RFC 5545 Compliant Output
Generates standards-compliant iCalendar files compatible with all calendar apps.
All-Day Event Support
Detects all-day events from missing times or explicit All Day column values.
Time Zone Handling
Parses AM/PM and 24-hour time formats for correct event scheduling.
Reminder Generation
Adds VALARM reminders when your spreadsheet includes a Reminder column.
Browser-Based Privacy
Files process locally in your browser. Event data never leaves your computer.
Data Transformation
Each CSV row becomes one VEVENT in the ICS file
Input
Event Row
CSV row with event fields
Key columns:
Subject,
Start Date,
Start Time
1:1 — One input row creates one output row
Output
VEVENT Component
Dates
Build DTSTART/DTEND
Content
SUMMARY, LOCATION, DESCRIPTION
Metadata
CATEGORIES, CLASS, STATUS
Subject and Start Date required per event
Common ICS Calendar Events (.ics) Import Errors
Issues you might encounter when importing Calendar Events CSV data to ICS Calendar Events (.ics) - and how we solve them
Missing Event Title
Event has no Subject/Title
Subject: (empty)
Subject: Team Meeting
Add a title to every event
Events without titles are labeled 'Untitled Event'
Missing Start Date
Event has no start date
Start Date: (empty)
Start Date: 01/15/2025
Every event needs at least a start date
Events without dates are excluded from output
Invalid Date Format
Date cannot be parsed
Start Date: 13/32/2025
Start Date: 01/15/2025
Use MM/DD/YYYY, YYYY-MM-DD, or DD/MM/YYYY format
Invalid dates cause events to be excluded
Frequently Asked Questions
You can, but free scripts and AI often miss edge cases that break real-world data: missing SKUs, currency formatting quirks, tax calculation errors, or date format mismatches. We have battle-tested validators specifically designed for accounting software imports that catch these issues before they corrupt your books. Plus, you get instant browser-based conversion without installing Python or managing dependencies.
The tool recognizes Subject/Title, Start Date, Start Time, End Date, End Time, All Day Event, Location, Description, Category, Private, Status, Organizer, and Reminder columns. It also recognizes common aliases for each field.
Yes. In Google Calendar, click the gear icon, go to Settings, then Import & Export, and upload the ICS file. All events will be added to your selected calendar.
Yes. Events are marked as all-day if the All Day column is TRUE, or if no start time is provided. All-day events use DATE-only format per the ICS standard.
Events without end times default to a 1-hour duration. All-day events without an end date are treated as single-day events.
Yes. The tool accepts both CSV and Excel files (.xls, .xlsx, .xlsm) with the same column detection logic.
Open the ICS file directly in Outlook, or go to File, Open & Export, Import/Export, and select the ICS file. Outlook supports iCalendar import natively.
If your CSV has a Recurrence or RRULE column, the value is passed through to the ICS output. Otherwise, each row creates a single non-recurring event.
Calendar → Calendar Data Ecosystem
All available data flows from Calendar to Calendar
Calendar
Calendar Events CSV
Calendar events CSV with dates, times, locations, and descriptions
→
Calendar
ICS Calendar Events (.ics)
iCalendar (ICS) format compatible with Google Calendar, Outlook, and Apple Calendar
Subject → SUMMARY
Start Date + Start Time → DTSTART
End Date + End Time → DTEND
Calendar
ICS Calendar Events (.ics)
iCalendar (ICS) events file with VEVENT components including dates, times, and recurrence
→
Calendar
Calendar Events CSV
Calendar events in CSV format for spreadsheet editing or Google Calendar import
SUMMARY → Subject
DTSTART → Start Date + Start Time
DTEND → End Date + End Time
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