Start free
ActionTrelloUpdated June 2026

How do I add a label to a Trello card?

Short answer: You can add label to card in Trello by hand from its own interface, but it won’t repeat itself. On TinyCommand, add the Trello Add Label to Card action to a workflow, map its 2 inputs from any upstream app, and it runs automatically every time the trigger fires. No code, and a free tier to start.

Add Label to Card in Trello — start free All 21 Trello actions
Add Label to Card in Trello — start free
Inputs

The fields this action accepts.

Every field can be mapped from an upstream trigger, AI step, table row, or hard-coded literal.

FieldTypeRequiredDescription
Card ID
cardId
stringRequiredCard ID
Label ID
labelId
stringRequiredLabel ID. Example: 5abbe4b7...
Sample request
{
  "cardId": "{{trigger.cardId}}",
  "labelId": "e.g. 5abbe4b7..."
}
Returns
[
  "label123",
  "label456"
]

Use these fields in downstream nodes for routing, logging, or error handling.

Triggered by

Apps that pair well as the trigger for Add Label to Card.

Any of these apps can fire this action as part of a workflow.

Gmail → Trello
1 Gmail triggers
Slack → Trello
13 Slack triggers
Google Sheets → Trello
2 Google Sheets triggers
HubSpot → Trello
18 HubSpot triggers
FAQ

Questions about Add Label to Card.

What does the Add Label to Card action do in Trello?
Adds a label to a Trello card by label ID. Use to tag cards based on their content (e.g. AI classification) or to auto-categorize new work.
What inputs does Add Label to Card require?
Required: Card ID, Label ID. Every input accepts a static value or a variable from any upstream node in your workflow.
Can I use dynamic inputs from earlier workflow nodes?
Yes. Any field on this action can pull values from upstream nodes, whether that's a form response, a trigger payload, an AI output, or a lookup result.
What happens if Trello returns an error?
The workflow pauses on the failed node, the error message is captured in the run log, and you can retry the run with one click. Auto-retry policies are configurable per workflow with exponential backoff up to 5 attempts.
Does Add Label to Card support batch operations?
Yes. Run Add Label to Card inside a Loop node to process arrays. TinyCommand handles Trello's rate limits automatically so you don't have to throttle manually.
More actions

Other Trello actions.

Action
Add Checklist Item
Adds an item to an existing Trello checklist on a card with optional pre-checked state. Used for templated work breakdowns or for capturing follow-ups from a meeting.
Action
Add Comment
Adds a comment to a Trello card with optional @mentions. Used for automation activity logs, AI summary notes, or status broadcasts.
Action
Add Member to Card
Assigns a member to a Trello card. Used for AI-driven routing or for auto-adding the on-call person to incoming bugs.
Action
Archive Card
Archives (closes) a Trello card. Hidden from the board but recoverable; the reversible alternative to Delete Card.
Action
Create Board
Creates a new Trello board with name, optional template, and default lists. Useful for templated project provisioning per customer.
Action
Create Card
Creates a new card on a Trello board list with name, description, due date, labels, members, and position. The standard write action for piping forms or tickets into Trello.
Add Label to Card in Trello — start free