Why this tool is useful
Review a calendar export before migration or publication while keeping private event names, attendees, meeting locations and attachment addresses on this device.
Local File Tools · runs locally
Private iCalendar and ICS File Auditor
Inspect a saved iCalendar file for event totals, duplicate UIDs, missing titles or start times, invalid dates, reversed ranges, time zones, recurrences, alarms and attachments without opening any referenced resource.
Ready. Your working data stays in this browser.
Files and capture streams stay on this device. Processing uses browser APIs only; nothing is uploaded to YTSave, the media API or a proxy. No server copy is created, stored or left to delete. The file picker is cleared when processing starts, and disposable worker memory is destroyed after completion or cancellation. Preview and generated-output memory is released when you clear the tool or leave the page.
How it works
A bounded line parser unfolds RFC 5545 continuations, treats every property and alarm as inert text, validates common date forms and never follows URL or ATTACH values.
Practical example
Export an ICS file, identify repeated UIDs and events whose end precedes their start, then correct missing summaries or invalid time-zone references before importing it.
Validation
The calculation is deterministic and explains validation errors instead of silently changing invalid input.
Privacy boundary
Input and output remain in this tab. Copy and download happen through browser APIs without a server upload.
Result passport
Every run reports its tool mode, timestamp and input/output size so transformed data can be audited.