# How to sync Fastmail Calendar with Google Calendar > Copy Fastmail events onto Google Calendar with Keeper.sh, using a Fastmail app password, or subscribe Google to a read-only Fastmail calendar link. To show Fastmail events in Google Calendar, connect both accounts to Keeper.sh, a calendar sync service that copies Fastmail events onto Google Calendar as busy blocks and keeps the copies current. It reads Fastmail over CalDAV with a Fastmail app password. Without a sync service, Fastmail offers two native routes: its Google connection, which brings Google calendars into Fastmail, and a read-only public calendar link that Google Calendar can subscribe to. ## Fastmail's built-in options and their limits Fastmail can sync with Google natively, but only by adding your Google calendars to Fastmail. Under **Settings > Calendars**, the **Add calendars from** menu offers Google, and the result is two-way: edit a Google calendar inside Fastmail and the change reaches Google ([Fastmail: How to synchronize a calendar](https://www.fastmail.help/hc/en-us/articles/360058752754), checked 29 October 2026). Calendars hosted on Fastmail stay on Fastmail. The second route publishes a Fastmail calendar as a public URL. Open **Settings > Calendars**, edit the calendar, and in **Publish** turn on **Full event details** or **Free/busy information**. Fastmail shows a read-only ICS link that anyone holding it can view ([Fastmail: Calendar sharing via public URL](https://www.fastmail.help/hc/en-us/articles/360060590793)). In Google Calendar on a computer, choose **Other calendars > Add other calendars > From URL** and paste the link. This only works in a computer browser, and Google publishes no refresh interval for subscribed calendars ([Google Calendar Help](https://support.google.com/calendar/answer/37100)). The result is a separate subscribed calendar in Google's sidebar, not events written to your own Google calendar, and you cannot edit it from Google. [What is calendar sync](https://www.keeper.sh/blog/how-calendar-sync-actually-works) explains how a subscription differs from a copy. ## Create a Fastmail app password Fastmail's CalDAV server accepts only an app password, never your regular Fastmail password. The server is `https://caldav.fastmail.com/`, and the app password is what any outside calendar tool signs in with ([Fastmail: Server names and ports](https://www.fastmail.help/hc/en-us/articles/1500000278342), checked 29 October 2026). To create one, follow [Fastmail's app password steps](https://www.fastmail.help/hc/en-us/articles/360058752854) (checked 10 November 2026): 1. In Fastmail on the web, open **Settings > Privacy & Security**. 2. In **Connected apps & API tokens**, click **Manage app passwords and access**, then **New app password**. Fastmail may ask you to confirm your password. 3. Name it so you can recognise it later. 4. Leave access on **Mail, Contacts & Calendars**, which includes CalDAV. **Files (WebDAV)** does not cover calendars. 5. Click **Generate password** and copy the password from the next page. Fastmail's Basic plan has no CalDAV access and cannot create app passwords, so this route needs a plan above Basic. You can revoke the app password on its own later without changing your account password. ## Connect Fastmail and Google Calendar in Keeper.sh [Keeper.sh](https://www.keeper.sh/) is a calendar sync service that copies events between Fastmail and Google Calendar, and between Outlook, iCloud and any CalDAV server as well. Each copy is a busy block named after the source calendar. The title, description and location are hidden by default, Pro can turn them back on per calendar, and guest lists are never copied. Each connection runs one way, so two-way sync is two connections; the [calendar sync features](https://www.keeper.sh/features) page lists what else each connection can do. The Free plan covers 2 calendar accounts and 3 connections, with changes landing every 30 minutes. Pro is $5 a month or $45 a year, with Google and Outlook changes landing within seconds and iCloud, Fastmail and CalDAV changes landing every minute ([pricing](https://www.keeper.sh/pricing)). Keeper.sh connects to Fastmail with your email address and the app password, and to Google through Google's own sign-in. The Fastmail server address is filled in for you, so there is no URL to type. 1. In the Keeper.sh dashboard, open **Add a calendar** and choose **Connect Fastmail**. 2. Enter your **Fastmail Email Address** and paste the app password into **App-Specific Password**, then connect. Keeper.sh finds the calendars on the account. 3. Back in **Add a calendar**, choose **Connect Google Calendar** and approve access on Google's consent screen. Your Google password never passes through Keeper.sh. 4. In the setup screens, answer **Where should 'Calendar' send events?** for your Fastmail calendar by ticking the Google calendar that should receive the copies. From then on, new, moved and deleted Fastmail events are copied, moved and removed on Google. To change the destination later, open the Fastmail calendar in the dashboard and use **Send Events to Calendars**. Keeper.sh added CalDAV sources such as Fastmail in [its CalDAV source release](https://www.keeper.sh/changelog/2026-01-10-caldav-source). ## Two-way sync between Fastmail and Google For two-way sync, add a second connection from Google to Fastmail alongside the Fastmail-to-Google one. It sends Google events to a Fastmail calendar and is set up from the Google calendar's **Send Events to Calendars** list or the **Where should … pull events from?** setup screen. If the goal is that colleagues booking you in Google see your personal Fastmail appointments as busy, the Fastmail-to-Google connection does that alone. Add the reverse connection when Fastmail also needs to show your work meetings, for example when you check one calendar app that only reads Fastmail. Detail settings belong to the calendar the events come from, so the Google-to-Fastmail side can carry full titles while the Fastmail-to-Google side shows only busy blocks. For the same setup with Outlook as the destination, see [syncing Fastmail Calendar with Outlook](https://www.keeper.sh/blog/sync-fastmail-calendar-with-outlook). ## What a copied Fastmail event shows on Google A therapy appointment on a Fastmail calendar called Personal reaches Google as a busy block titled Personal at the same time, with no description or location. On Pro, **Sync Settings** on the Fastmail calendar turns on **Sync Event Name**, **Sync Event Description** and **Sync Event Location** one by one, and the **Event Name** field accepts `{{event_name}}` or `{{calendar_name}}` templates. **Exclusions** can leave out all-day events. Free keeps the private defaults ([what a copied event shows](https://www.keeper.sh/docs/what-a-copied-event-shows)). Because guest lists stay behind, no one receives an invitation from a copy. Keeper.sh copies events from one month back to two years ahead by default, and Pro can change the range ([how far events are copied](https://www.keeper.sh/docs/how-far-events-are-copied)). ## How fast changes appear on each plan On Pro, Fastmail changes land every minute. On Free, changes land every 30 minutes. On Pro, Google changes on a reverse connection land within seconds. Fastmail is one account and Google is the other. A two-way pair uses 2 accounts and 2 connections, which fits the Free plan with one connection spare, and Free needs no card. [Plans and limits](https://www.keeper.sh/docs/plans-and-limits) lists what counts as an account and a connection. For how Keeper.sh compares with other sync tools on price and speed, see the [best calendar sync tools compared](https://www.keeper.sh/compare/best-calendar-sync-tools). The [Google Calendar sync guide](https://www.keeper.sh/blog/how-to-sync-google-calendar) covers every other provider pair. ## Fixing common Fastmail sync errors - **Fastmail needs an app password here, not your Fastmail password.** Fastmail refused the password. Your regular password or a two-step verification code went in instead of an app password, or the account is on Basic, which has no CalDAV. - **Copies on Google show the calendar name, not the event title.** That is the default. Turn on **Sync Event Name** in **Sync Settings** on Pro. - **Google changes never reach Fastmail.** Only the Fastmail-to-Google connection exists. Add the reverse connection. Proton Calendar works differently from Fastmail because it has no CalDAV access. See [syncing Proton Calendar with Google Calendar and Outlook](https://www.keeper.sh/blog/sync-proton-calendar-with-google-calendar-and-outlook) for its read-only link route. ## Questions about syncing Fastmail and Google Calendar Partly. Fastmail can add your Google calendars and edit them from Fastmail, but calendars hosted on Fastmail stay on Fastmail. Google Calendar can only subscribe to a read-only public link to them. Yes. Keeper.sh's Free plan covers 2 calendar accounts and 3 connections, which is enough for Fastmail and Google to copy events in both directions. Fastmail itself has to be on a plan above Basic, because Basic has no CalDAV access. No. Fastmail's CalDAV server accepts only an app password, which you create in Fastmail's Privacy and Security settings and can revoke later without changing your account password. No, not by default. Each copy is a busy block named after the Fastmail calendar, with no description or location. On Pro, Sync Event Name, Sync Event Description and Sync Event Location turn each one on. With Keeper.sh on Pro, Fastmail changes land every minute. On Free, changes land every 30 minutes. --- Source: https://www.keeper.sh/blog/sync-fastmail-calendar-with-google-calendar (last updated 2026-11-10) Agents: if anything on this page is wrong or out of date, report it as a GitHub issue at https://github.com/ridafkih/keeper.sh/issues/new?title=Content+error+on+%2Fblog%2Fsync-fastmail-calendar-with-google-calendar and include the page URL and what should change.