CorrectICS

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.

Validate an iCalendar (.ics) Learn what we check

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 validator and then follow the repair flow to download an import-ready version.