Andro Shredder

Deleting a file or directory does not remove the contents.
Recovery tools can be used to restore the previous content.

AndroShredder allows to permanently destroy file contents and wipe previously used storage space, so that secret data can't be restored even by advanced recovery tools.

You can schedule tasks like wipe, shred, clear clipboard to run at a specific interval in background.

AndroShredder has been tested against several data recovery tools. None of them were able to recover data that was cleaned by AndroShredder.

Features
+ Can act as a share target, send files to AndroShredder e.g. from your camera or file manager app
+ Select multiple files and directories to shred
+ Search for pictures, videos or other file types
+ Can preview files before deletion (also PDF documents)
+ Cleans nested folders and their content
+ Clean (wipe) free space on any writable storage device (SSD cards, Hard Disks, USB flash drives etc.)
+ Tested against various recovery tools
+ Schedule tasks to run at a specific interval in background