Simple file encryption/decryption software for Windows?

Question

I'm looking for a software to encrypt and decrypt a file in Windows. It should be:

simple (not too many features, should be able to just encrypt and decrypt it back)
light-weight/portable (just few hundred KBs if possible)
available as a single binary (executable file).

I use AESCrypt (you right click on files and an option to encrypt/decrypt is in the context menu) — markasoftware, Commented Sep 24, 2014 at 0:05
I guess, the question follows the guideline now. Can you guys please care to upvote it now? :) — Dilip Raj Baral, Commented Sep 24, 2014 at 13:59
I did (almost half a year after you posted it). It is, indeed, a perfectly cromulent question now — Mawg, Commented Jan 22, 2015 at 8:57
@Mawg Thanks :) It would be great if at least two others did too. — Dilip Raj Baral, Commented Jan 22, 2015 at 18:47

Steve Barnes · Accepted Answer · 2014-09-24 06:54:45Z

I would suggest taking a look at gpg4usb:

Not as small as a few kB but still only a 23 MB download
Portable so you don't have to install to the machine in question just unzip and use.
Runs on both Windows and Linux (Mac under development and in Alpha at the time of writing Sept 2014)
Free (Libra & FLOSS)
Public/Private Key based i.e. the recipient does not have the key that was used to encrypt the file.
Compatible with GPG so for people who already have that installed, regardless of platform, they can receive and decrypt the file, (given the key).
GUI based so easy to use.

Screen Shot of Encrypting a file

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