Free online CSV to ICS converter

Source format: CSV

CSV (Comma-Separated Values) is a plain-text tabular format that stores data in rows and columns. It is widely used in spreadsheets, databases, CRM systems, and export tools because it is simple and easy to exchange between programs. For calendar conversion, a CSV file usually contains fields such as event title, start date, start time, end date, end time, location, and description.

Target format: ICS

ICS is the file extension for the iCalendar format, a standard used for calendar events and schedules. It is supported by many calendar applications, including Google Calendar, Microsoft Outlook, Apple Calendar, and many mobile calendar apps. ICS files are designed for sharing events, importing schedules, and syncing appointments across devices and platforms. Compared with CSV, ICS preserves calendar-specific details such as event times, time zones, recurrence rules, reminders, and attendee information.

How to convert CSV to ICS

The best method depends on how your CSV is structured. Because CSV is only a table format, the conversion works correctly only if the columns can be mapped to calendar fields.

1. Check the CSV columns. Make sure your file contains clear event data such as title, date, time, and optionally location or notes. If the CSV came from another calendar or scheduling system, confirm the column names and date format.
2. Choose a conversion tool. For simple one-time conversions, you can use the built-in converter on 101convert.com for free without installing any software. For local workflows, spreadsheet software or scripting tools may also help prepare the data before export.
3. Upload or open the CSV file. If using the online converter, select your .csv file and choose ICS as the output format.
4. Map the fields. Assign the CSV columns to calendar properties such as SUMMARY, DTSTART, DTEND, LOCATION, and DESCRIPTION. If the tool asks for date and time formats, match them exactly to the values in your CSV.
5. Convert and download. Start the conversion and save the resulting .ics file.
6. Import the ICS file into your calendar app. In most calendar programs, use File → Import or the app’s calendar import option, then select the generated .ics file.

If you need to prepare the CSV first, LibreOffice Calc or Microsoft Excel can help clean up dates, split columns, and ensure consistent formatting before conversion.

Quality, compatibility, and limitations

CSV to ICS conversion is only as accurate as the source data. The main limitation is that CSV does not define calendar semantics on its own, so the converter must infer which columns represent event fields. If dates are inconsistent, missing, or written in mixed formats, the resulting ICS file may import incorrectly or create events at the wrong time.

Pay special attention to time zones, because a CSV file often stores local times without timezone information. If your events span multiple regions or include all-day events, verify that the converter handles those cases correctly. Recurring events, reminders, and attendees are also not always representable in a simple CSV file unless the source includes extra columns and the converter supports them.

After conversion, test the .ics file by importing a small sample into your calendar app first. This helps confirm that titles, dates, and times appear correctly before importing a larger schedule.