calendr.events

Fix / calendar toolbox

UID Checker

Distinguish missing IDs, duplicates, revisions and recurrence overrides.

Processed in your browser

Opening your local workspace…

How it works.

  1. 01Open an ICS file.
  2. 02Inspect UID plus RECURRENCE-ID identities and revisions.
  3. 03Review exact/revision duplicates separately from legitimate overrides.

The important details.

A recurring master and its overrides legitimately share UID. Duplicate identity is not the same as duplicate UID.

A good question.

Should I regenerate every UID?

Usually not. UIDs identify updates. Changing them can create duplicate imports; use explicit repairs only when needed.

Keep going.

All tools →

Organize

Duplicate Finder / Remover

Separate exact copies, same-UID revisions and potential lookalikes.

Organize

Smart Merge + Deduplicate

Combine files with explicit exact-duplicate and revision handling.

Fix

Recurrence Validator

Check RRULE, exceptions and bounded occurrence behavior.

Your file stays in this browser tab. No account, no calendar upload, no calendar-content storage. Read our privacy approach.