Using Custom Fields
Custom Fields are a powerful customization tool for your boards, allowing you to add new field types and custom data to your Trello cards, making them more specific to your workflow.
Custom Fields is a built-in feature of Trello, and available on Trello Standard and above.
Creating a custom field
From the right-side Board Menu, or the "Add to Card" section of the card back, you can click on Custom Fields, followed by + New Field:
Type will specify the type of input that can be entered for the field—this can be set to "Checkbox," "Date," "Dropdown," "Number," or "Text". If you select "Dropdown," you'll have the option to enter the choices for that dropdown. Name is the name of the field. A field name can be up to 25 characters in length.
Once enabled, the field will show on both the front and back of the card:
Using Custom Fields
Once you've set up some custom fields, you can enter values for those fields by clicking on the field on the back of the card:
Clicking on the Custom Field button, and then the entry in the list, will edit the custom field entry itself, and change the name of it. Press Enter or click the back arrow to save the name of your Custom Field:
Once a field is created, you cannot change its type.
Editing and deleting custom fields
You can delete/edit custom fields from the card back. Open the card and click the "Custom Fields" button on the right-hand side. Then, select the custom field you'd like to edit. A pop-up window will appear, and you'll be able to edit the fields or click on the "Delete Field" link at the bottom.
Reordering custom fields
Click the "Custom Fields" button on the right-hand side of a card back then drag and drop their location in the list. The new arrangements are reflected immediately on all cards on the board.
Moving cards with custom fields
When you move or copy a card that has values stored in Custom Fields, the data will be moved to the new board. When the card is moved/copied, Trello checks to see if you already have a field on the new board with the same name and field type. If so, the card will use the existing field definition on the new board. If it doesn't find a matching field, it will create a new field.
A card that has an empty value for a custom field will not create the new field on the board to which it is copied or moved.
Custom field data in board exports
Custom field data is included in both the JSON export and, for Premium subscribers, the CSV export. To learn how to export your boards to either JSON or CSV, read our article here.
Custom field limits
A board can have up to 50 custom fields defined on a board. Any number of cards on the board can have values set for each field.