Limits for iCloud Contacts, Calendars, Reminders, and Bookmarks
To help iCloud keep your Contacts, Calendars, Reminders, and Bookmarks up to date, keep your information within these limits.
Calendars and Reminders
Total number of calendars, events, and reminders: 50,000
Maximum combined number of calendars and reminder lists you can have: 100
Maximum size of all calendar and reminder data (not including attachments): 24 MB
Maximum size of all event attachments: 1 GB
Maximum size of a calendar event including attachments: 20 MB
Maximum number of attachments per event: 20
Maximum number of attendees you can invite to an event: 300
Maximum number of people with whom you can share a private calendar: 100
Maximum number of characters in a reminder title: 100
Contacts
Total number of contact cards: 50,000
Maximum size of a contact card: 256 KB
Maximum size of a contact photo: 224 KB
Maximum size of a contact group: 256 KB
Maximum size of all contact cards:
Card text: 48 MB
Card photos: 200 MB
Supported file types for a contact photo: JPEG, BMP, PNG, GIF
vCard import limits:
Total number of vCards: 50,000
Maximum size of a vCard: 256 KB (photo + text)
Maximum photo size for a vCard: 224 KB
Bookmarks
Total number of bookmarks: 25,000
Maximum size of a bookmark: 4 KB
Maximum size of all bookmarks: 24 MB
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