Below is links to software to perform "secure delete", i.e. delete files in such a ways that it is impossible to restore the files. The software have been tested but you have to make your own decision before you use them (use them at your own discreation).

Deleting files without “secure delete” software just hides it from the operating system. It isn't really gone until that same space is overwritten by something else. This is exactly what a “secure delete” software does; it overwrites selected files ensuring that's they can never be un-deleted with file recovery software. Use “secure delete” software when decommissioning old hardware, e.g. hard drives, to ensure no data is available to help an attacker gain useful information.

Eraser is an open source secure file erasure tool available for the Windows operating system. It supports both file and volume wiping.

Eraser securely erases data by overwriting it such that the data is irrecoverable. It supports a variety of data destruction standards.

Freeraser is a tool (for Windows) that allows you to securely delete files directly in File Explorer using drag-and-drop.

The program offers three destruction modes for securely deleting your data.

File Shredder is program (for Windows) that allows you to securely erase files and securely wipe free disk space.

The program provides five different methods for securely deleting files.

SecureDelete is a program (for Windows) that allows you to securely delete files and folders using one of four shredding methods.

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