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): 1GB
Maximum size of a calendar event including attachments: 20MB
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: 1000
Contacts
Total number of contact cards: 50,000
Maximum size of a contact card: 256KB
Maximum size of a contact photo: 224KB
Maximum size of a contact group: 256KB
Maximum size of all contact cards:
Card text: 48MB
Card photos: 200MB
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: 256KB (photo + text)
Maximum photo size for a vCard: 224KB
Bookmarks
Total number of bookmarks: 25,000
Maximum size of a bookmark: 4KB
Maximum size of all bookmarks: 24MB
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