Calendar (.ics) import failed or the file is not a valid iCalendar
Last reviewed 2026-09-19
An .ics file is plain text with strict structure: every BEGIN needs a matching END, events need dates in a specific format and each line has length and line-ending rules. Exports from scripts, older programs and text editors often break one of these, and calendars then refuse the whole file.
Messages you might see
- “Import failed / Could not import the calendar file”
- “The file is not a valid iCalendar file”
- “No events were found in the .ics file”
Why it happens
- Unbalanced BEGIN / END blocks or a missing calendar wrapper.
- Dates in a format other than the iCalendar one, or missing UIDs and timestamps.
- Wrong line endings or over-long lines that were not folded.
Try this first (free, no tool needed)
- Open the file in a text editor and check that it starts with BEGIN:VCALENDAR and ends with END:VCALENDAR.
- Try importing into a different calendar app to see whether it is the file or the app.
- If the file has thousands of events, split it and import in pieces to find the bad one.
If that didn't work
These tools run in your browser. Your file is read and repaired on your own device and is never uploaded.
Corrupted ICS Calendar Repair
Closes unbalanced blocks, removes stray END lines, adds a missing calendar wrapper, VERSION, PRODID, UIDs and timestamps, converts sloppy dates to the iCalendar format and writes standards-compliant line endings and folding.
Open Corrupted ICS Calendar RepairCommon questions
Will it change my events?
It repairs structure and formats. The event titles and times you wrote are kept.
Is my file uploaded anywhere?
No. The tool runs as a program inside your own browser, so the file is read and repaired on your device and never sent to a server.