How to connect Slack to Zapier for automated notifications

How to Connect Slack to Zapier for Automated Notifications

Slack is one of the most commonly used apps on Zapier, with over 40 triggers and actions available as of April 2026. The integration allows external events (form submissions, CRM updates, support tickets) to automatically post notifications in Slack channels.

Step 1: Create a New Zap

Log into Zapier and click "Create Zap." Decide the automation direction:

• Slack as trigger — Events in Slack start the workflow (new message, reaction added, new channel)
• Slack as action — Events from other apps send notifications to Slack

The most common pattern is using Slack as an action: something happens elsewhere, and Slack receives a notification.

Step 2: Authenticate the Slack Account

When adding a Slack trigger or action, Zapier prompts for authentication. Click "Sign in to Slack" and authorize the Zapier app in the Slack workspace. The authorizing user must have permission to install apps in the workspace. Once connected, the Slack account appears in the account dropdown for future Zaps.

Step 3: Choose the Trigger or Action

Common Slack Triggers

• New Message Posted to Channel — Fires when any message appears in a specified channel
• New Reaction Added — Fires when an emoji reaction is added to a message
• New Mention — Fires when the connected user is mentioned
• New Saved Message — Fires when a message is bookmarked

Common Slack Actions

• Send Channel Message — Post a message to a specified channel
• Send Direct Message — DM a specific user
• Set Channel Topic — Update a channel's topic
• Create Channel — Spin up a new channel with a given name
• Find User by Email — Look up a Slack user by email address

Step 4: Map Channels and Data Fields

Select the target channel from the dropdown (Zapier loads all channels the connected user can access). Use dynamic data from the trigger step to populate the message body. Slack messages support basic formatting: *bold*, _italic_, `code`, and <https://url|link text>.

Step 5: Test the Zap

Click "Test step" to send a sample message to the selected channel. Verify formatting, channel targeting, and data accuracy. Turn the Zap on when testing is complete.

Practical Example: CRM Deal Notification

1. Trigger: New Deal Created in HubSpot
2. Action: Send Channel Message to #sales-wins
3. Message template: "New deal: {Deal Name} | Value: {Amount} | Owner: {Deal Owner}"

This keeps the sales team informed of new pipeline activity without checking the CRM.

Tips

• Use Slack Block Kit formatting for richer messages (available via the "Send Channel Message" action's advanced options)
• Add a Filter step before the Slack action to send notifications only for high-value events
• Rate limit: Zapier sends Slack messages at approximately 1 per second; high-volume Zaps may experience minor delays