Connect Trello to Slack with the Trello app for Slack: type /trello login in any channel, select Link account, then allow access on both sides. The app creates cards, previews Trello links and saves messages to your Trello Inbox. For notifications about board activity in Slack, you'll also need the Slack Power-Up.
Two pieces, two jobs
There are two parts to this connection, and mixing them up is the reason most people think it isn't working. The Trello app for Slack works from the Slack side: it creates cards from Slack, previews Trello links posted in channels, and saves Slack messages into your Trello Inbox. The Slack Power-Up works from the board side, and it's what sends board activity into Slack as notifications.
If you only want to turn messages into cards, the app is enough. If you want a channel to hear about card moves and comments, you need both.
Linking the accounts
- Check the Trello app is in the Apps section in Slack. If it isn't there, your Slack admin has to add it first.
- In Slack, type /trello login in any channel and select Link account.
- Select Allow to let Trello access Slack, then Allow to let Slack access Trello.
- Invite the app to each channel where you want it, with /invite @Trello. It doesn't join channels on its own.
- For activity notifications, link the Workspaces in Trello's Workspace settings and add the Slack Power-Up to the board.
Each person links their own accounts, so a team rollout means everyone runs /trello login once. If you're bringing new people into the workspace at the same time, this guide on inviting someone to Slack covers that part.
Saving messages as cards
There are three quick ways to capture a Slack message, and all of them land in your Trello Inbox:
- Slack's Save for later.
- The :inbox_tray: emoji reaction on a message.
- The Create card from message shortcut.
An AI summary of saved messages is on by default, and you can switch it off in the app's Home tab. It isn't available if your Enterprise has AI turned off.
Link previews and who sees them
When someone posts a Trello link, the app can show a preview of the board or card to channel members, even if they don't have a Trello account. That only happens for Workspace-visible content in the linked Trello Workspace; private boards aren't unfurled. If previews get noisy, message any channel with /trello previews to switch them off.
Board visibility can leak messages
Here's the part worth a pause. Atlassian Trello Support's page on the Trello app for Slack points out two things. First, the app doesn't send board activity to Slack on its own; notifications need the separate Slack Power-Up and a Workspace link. Second, saving a Slack message to a board can show it to people who couldn't see it in Slack. A message from a private channel saved onto a board that the whole Workspace can see is now visible to the whole Workspace.
So before your team starts saving client messages to boards, check each board's visibility matches the channel it's coming from.
When linking fails
If you see 'Uh oh! There was an error adding Trello to Slack', revoke the Trello Slack App in your Trello account settings, then start again with /trello logout followed by /trello login. One more limit to note: Trello for Slack is currently only available in English.
If your team plans work on dates, the calendar view for Trello boards pairs well with Slack notifications, so deadlines show up where people are already talking.
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How Asana and Linear connect to Slack
Asana's Slack app turns Slack requests and action items into tasks and comments. Linear's Slack integration can create issues from Slack messages and sync comment threads between the two. If you're reviewing your chat tool as well, here's my list of other team chat apps.
My advice for a small team
Start with the app: everyone links their account, and you agree one capture habit, such as the :inbox_tray: reaction, so requests stop getting lost in threads. Add the Power-Up to one busy board and point it at one channel. Check board visibility before anyone saves a message from a private channel.
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Frequently asked questions
How do I link Trello and Slack accounts?
Type /trello login in Slack, select Link account and allow access on both sides.
Can I get Trello notifications in Slack?
Yes, with the Slack Power-Up and linked Workspaces.
How do I save a Slack message to Trello?
Use Save for later, the :inbox_tray: reaction, or Create card from message.
Why does the Trello bot not preview my link?
It has to be invited to the channel, and the card or board must be Workspace visible.
Does it work in other languages?
Trello says it's currently only available in English.
