Task tags organise tasks and add context to them, such as Client, Design or Content. A task can have several tags, and each tag has a colour. Administrators manage every task tag in the account in Settings › Project Management Settings, under Task Tags.
Add tags to a task
Open the task and click in Tags.
Type at least two characters of the tag name. Choose an existing tag from the list, or keep typing to create a new one.
To rename a tag or change its Tag color, click the tag on the task.
To add or edit tags on a task, you need the Update task permission on your membership of the project. Administrators can on any task.
Tags show on task lists and board cards. Use the Tags filter to find tagged tasks in a project, in My Tasks or in All Tasks, and the Task Tags filter in the Task List report. The same tags can label files: add them under Add Tags when you upload files in a project's Files view.
Tags belong to a project
Each project keeps its own task tags. The Tags field suggests tags already used in that project, and editing a tag from a task changes it in that project only. This keeps tag names from one project from being suggested in another, where they might be sensitive. It also means the same tag name can have different colours in two projects.
Manage all task tags
Go to Settings › Project Management Settings and find Task Tags. Use Search to find a tag.
Click a tag to open Tag Details.
Change the Tag Name, or pick any Color with the colour picker, and click Save. To remove the tag, click Delete instead.
A change here applies to every task and file with that tag, in every project. Deleting a tag removes it from all of them. There's no Add button: new tags are created on tasks.
Merge tags
The Task Tags list shows one row for each tag name and colour. The same tag in two projects appears as one row if the name and colour match. If the colours differ, you see two rows.
To merge the two rows, open one and change its colour, or its name, to match the other. From then on, any edit you make in Settings applies to the tag on every task, whatever project it's in.
See the task management guide for more about tasks, and project tags for tagging projects.