CorrectICS

iCal / iCalendar Validator

If you’re seeing “invalid iCalendar” errors, events at the wrong time, or an import that silently fails, this tool helps you validate the underlying .ics file (also called iCal / iCalendar).

Validate an iCalendar (.ics) ICS validator landing page

Common iCalendar import problems

  • “Invalid ICS file” / “validation failed” errors
  • Wrong time / 1-hour-off events (timezone/DST)
  • Broken recurring events (RRULE)
  • Missing required properties or malformed lines
Need a fix, not just a diagnosis? Use the **ICS validator** to understand the problem, then follow the repair flow to download an import-ready version.