StegX 
Encode Message
This app will allow you to encode your data with an optional Encryption Key and store that data secretly in an image file. That image file can then be passed to other people or even displayed on a website without anybody knowing that it contains an encrypted message.
Note: iPhone users will only be able to Decode messages due to iPhone's inability to correctly save PNG files.
Disclaimer: No data or images are stored or transmitted to or from this server. All data is temporarily stored securely within your own browser session.
Decode Image
To decode the concealed encrypted data that is stored within the image file, simply upload the image file from your device and enter the optional Encryption Key if one was provided.
The encoded image file will end with a .png extension.
Disclaimer: No data or images are stored or transmitted to or from this server. All data is temporarily stored securely within your own browser session.