A free, open source, on-the-fly (OTFE) transparent disk encryption program
Protecting sensitive files from being accessed can be done via various methods, encryption being one of them. Single files can be easily encrypted, but sometimes entire drives have to be protected this way.

FreeOTFE has been developed for this particular purpose and it can encrypt and decrypt the data as it is written or read from the hard disk; actually, this is what OTFE stands for: “on the fly encryption.”

Hassle-free installation procedure

The application is easy to install, but take into consideration that using it requires administrative privileges; sometimes a computer restart is required for all the changes to take effect and the product to work properly.

Looks are not impressive but the minimalist interface is intuitive and easy to use. In the upper part there Are the main options while the largest chunk of the application window is reserved for listing the encrypted drives.

Functionality at a glance

An encrypted drive is actually some storage space that has been protected and mounted so that it can function as a regular partition. All the data on it is available in encrypted form and because of this you should expect decreased performance when working with it.

Once the virtual drive is unmounted all the data on it becomes inaccessible without the right password.

The application makes available multiple cyphers that can be applied. Among them there is AES, Blowfish, RC6, CAST and DES.

Free, on the fly encryption

FreeOTFE may not appear to be the easiest encryption tool but the wizard-driven interface coupled with extensive online documentation should change this opinion. It works as advertised; expect a drop in performance when working with encrypted files.

Reviewed by , last updated on April 24th, 2014

Also available: Portable FreeOTFE

file size:
2.8 MB
developed by:
Sarah Dean
license type:
operating system(s):
Windows All
C: \ Security \ Encrypting


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12 Screenshots
FreeOTFE - This is the main window of FreeOTFE where you can explore and manage all created volumesFreeOTFE - When you want to create a new item, you will need to select the type of volume it should beFreeOTFE - This window will require you to choose the hash and cipher you want to useFreeOTFEFreeOTFEFreeOTFEFreeOTFEFreeOTFEFreeOTFEFreeOTFEFreeOTFEFreeOTFE
What's New in This Release:
  • Added Russian language translation
  • Added translator credit to "About..." dialog
  • Minor tweaks to portableapps .com launcher
read full changelog

Application description

FreeOTFE is a free, open source, "on-the-fly" (OTFE) transparent disk encryption program.Using this software, you can ...

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