iCal validator: validate iCal / iCalendar (.ics) files

If you searched for “iCal validator”, you’re almost always trying to validate an iCalendar file — usually a file ending in .ics.

On CorrectICS, the “iCal validator” and “ICS validator” are the same thing:

• ICS validator (validate ICS)
• iCal / iCalendar validator

To validate and repair a real file, upload it to: /fix.

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What does an iCal validator check?

iCal / iCalendar validators typically check:

• required iCalendar structure and event blocks
• missing required fields (DTSTART, UID, VERSION, etc.)
• timezone correctness (TZID/VTIMEZONE) and DST behavior
• formatting issues that cause silent import failures

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If your problem is “wrong time” after import

Wrong-time imports usually mean your .ics contains a timezone mismatch.

Start here:

• Fix ICS timezone errors (events at the wrong time)

And for the deeper TZID/VTIMEZONE explanation:

• Fix ICS time zone errors (TZID/VTIMEZONE)

Fix your .ics file in seconds

Upload an iCalendar file and get a clean, import-ready version for Google Calendar, Outlook, Apple Calendar, and Teams.

Try the CorrectICS Autofix Tool Back to Help