Browser-local calendar diagnostics

ICS Doctor Lite

Inspect common structure, time zone, and recurrence risks without uploading or changing your calendar file.

Open automated tests

Step 1

Open or paste one calendar

Maximum 2 MB · 500 VEVENTs
Private by design: this static page reads the file in your browser. It does not upload, save, track, or modify the source.

Paste calendar text below.

Ready. Your input stays in this browser tab.