Using the Custom Fields Power-Up
Enabling the Power-Up
To enable the Power-Up, open the board menu on the right side of the page, and select the Power-Ups menu option. From the Power-Ups directory, you'll find Custom Fields under the Board Utilities category. Click the "Enable" button next to the Custom Fields Power-Up.
Creating a custom field
Once the Power-Up is enabled for the board, you can click the Custom Fields button on the back of a card to add a 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 the Power-Up
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 Power-Up button, and then the entry in the list will edit the custom field entry itself, and change the name of it. Press 'ENTER' 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. Please 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.
Disabling the Power-Up
You can disable the Power-Up for the board by opening the Power-Ups directory, and clicking on the "Enabled" section. Then, click the setting cogwheel and select "Disable".
While the fields will no longer show up on cards, you can re-enable the Power-Up and the fields and values you entered previously will still be there.
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. You will need to enable the Custom Fields Power-Up on the new board to see the data, though. 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 Business Class users, 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.