PGP Copy od Thomas Wollin

Encode and decode text to your clipboard instantly from your right-click menu! Why use a separate tool or website when your clipboard could do it for you instantly? Copy encoded, paste decoded (or vice versa!). No more need to switch to other tools or go to 3rd party encryption/decryption services (that may log your queries!). The streamlined interface makes it easy to change encryption schemes with the click of your mouse. Optional keyboard shortcuts to override Ctrl+Shift context for a truly enhanced 'copy and paste' experience. Full PGP key management, including generating, importing, and exporting new/existing encrypted/open PGP keys. All messages are encoded and decoded locally using your browser and your PGP keys are stored in your browsers local storage to ensure maximum confidentiality.

Because the tool either writes to, or copies from, the clipboard, you can combine Copy+Encode with Paste+Encode to encrypt the text twice, or the reverse options for each to decode a string that has been encoded twice. You can also switch encoding methods between Copy+Encode and Paste+Encode if you wanted to easily apply two separate encoding schemes to your message.

List of currently supported encryption schemes:

PGP
Base64
Base32
Base58
Ascii85
URL encoding/decoding
Hexadecimal
Binary
HTML Entities
Unicode Escape
Morse Code
Caesar Shift
Vigenère Cipher
XOR Cipher
ROT-N (Default set to ROT13)
Simple Text Reversal
Upper/Lowercase Swap (a->A or A->a)