Proton Calendar allows you to add the calendars of friends, family, colleagues, and organizations that do not use Proton Calendar so you can keep track of all their upcoming events in one convenient and secure app. To add an external calendar, simply subscribe to its public address link.
Regardless of your Proton subscription plan, you can subscribe to up to five external calendars and read their events. However, you will not be able to edit or delete the events on any external calendar you are subscribed to.
How to get an external calendar link
Most popular calendar apps allow you generate a shareable link similar to how Proton Calendar does. To subscribe to an external calendar, the owner of the calendar must share this link with you or make it public. The owner of the calendar might also be able to set different access and permission levels (i.e., they might decide that you will only be able to see the times when an even is taking place, not the event details themselves).
To change your permission level to a calendar, you must speak to the calendar owner and request a new link.
To request a link from someone who uses Google Calendar:
- On a computer, open Google Calendar. (You can only get the link you need from the Google Calendar for web, not the mobile Google Calendar apps.)
- In the top right, click the settings gear wheel icon → Settings.
- On the left side of the screen, click the name of the calendar you want to share.
- Scroll down to Integrate calendar and copy the link in the Secret address in iCal format field. This link can be added to Proton Calendar using the instructions below.
Outlook Calendar on the Web
To request a link from someone who uses Outlook Calendar Web (or Outlook.com):
- Open Outlook, go to Calendar view, click the settings gear wheel icon → View all Outlook settings.
- Select Calendar → Shared calendars.
- Under Publish a calendar, select the calendar you want to publish and how much detail you want to share.
- Click Publish.
- Copy the link in the ICS field. This link can be added to Proton Calendar using the instructions below.
If these instructions are not right, they might be using classic Outlook on the web. You can find those instructions here. Be sure they follow the instructions under Publish and share the ICS link.
To request a link from someone who uses Proton Calendar, send them the link to this Support article: How to share a Proton Calendar with a link.
Country and city public websites usually provide a calendar of holidays and other public events via a URL you can subscribe to or an ICS file you can import. Here is one example of a website that provides calendars that track each country’s official holidays: https://www.officeholidays.com/subscribe/
How to subscribe to an external calendar
- Once you have a calendar link, log in to Proton Calendar for web and click Settings → Go to Settings → Calendars → Subscribed calendars.
- Click on the Subscribe to calendar button. This will open a new window where you will need to paste the calendar URL and click Subscribe.
Proton Calendar will immediately create a new calendar, but it may take several minutes for all its events to show up.
You can change the name and description of an external calendar by clicking the Edit action button next to it on the Subscribed calendars page. (Note: You cannot edit a calendar until it is fully synchronized.)
External calendars that you subscribe allow you to view calendar events (depending on the permission level of the link) but you cannot edit or delete these events. You also cannot be set an external calendar as your default calendar, cannot share or export it, and cannot import events to it.
External calendars do not count toward your limit of personal calendars and are listed under Subscribed calendars.
Unsubscribe from a calendar
- Log in to Proton Calendar and click Settings → Go to Settings → Calendars → Subscribed calendars.
- On the Subscribed calendars page, click the action button next to the corresponding calendar and select Unsubscribe from the dropdown menu.
This will remove the calendar along with all its events.