If you want to free up storage or delete files for other reasons, here's how to delete files and folders from Dropbox.

Make a change on one machine in the Dropbox folder—remove a file, add one, reorganize items into folders, or save changes—and that change is instantly propagated to every other synced machine.

You can delete a folder in Dropbox on a computer or mobile device, but you can only permanently delete a folder while signed in on a computer.

Dropbox also keeps track of revision history and file changes, and if someone deletes a file you shared with them (or you accidentally delete something), you can access and restore deleted files ...

Remember Dropbox, the service that lets you back up files, share them with others, and sync them with other PCs? It's no longer an invitation-only beta: Now anyone can sign up.