To delete files or folders on dropbox.com:
To delete files or folders on the desktop app:
To remove a file from your Dropbox, drag-and-drop it somewhere out of your Dropbox folder. To delete the file, drag the file or folder to your Recycle Bin or Trash.
Permanently deleting a file means that you can't recover it. Only the owner of a shared folder, or the person who originally uploaded a file that nobody else has edited, can permanently delete a file. Any files that appear in gray were previously deleted and can still be either recovered or permanently deleted.
To permanently delete files using the file browser on dropbox.com:
To permanently delete files using the deleted files page on dropbox.com:
To permanently delete a shared folder that you own:
To permanently delete a shared folder you don’t own, choose to Remove my access instead. This removes your access to the folder, but other members of the shared folder will not be affected. You can’t permanently delete a shared folder you don’t own for all members.
Notes about permanently deleting files
Deleted and permanently deleted files don't count against your storage quota. Permanently deleting files after they have already been deleted doesn't free any more space in your Dropbox.
For Dropbox Basic (free) and Plus users, deleted files are permanently deleted after 30 days. If you have a Dropbox Professional or Business account, files are permanently deleted after 120 days.
The Dropbox desktop application keeps a cache in your Dropbox folder for files and folders you move and delete. The cache is cleared automatically every three days. If you need to delete sensitive files immediately or need to clear up the space, you can manually clear your cache. When permanently deleting a shared folder you own, other members may still be able to access the content through their cache until it is cleared.