Project Gowst. Cover your JPEGs with ectoplasm!

Project Gowst is a free steganography app, to protect your private info. Also, it's pretty simple. Also, it's kinda robust. Also, you can open the picture of cute kitten or puppy, and watch it as small preview.
Download: https://drive.google.com/file/d/0B7a_RcOYUz31OWREN3AzRVI5Q1E/view?usp=sharing

CHOOSE NOT VERY BIG IMAGES. Like 500x500 or so isn't enough for you? Ok, take 800x800. But stop, please, don't use 3000x3000px image, it's just rude.
Note, it's not 100% finished, decoding is slow as brick, there is some bugs, etc, etc, etc.

How to use built-in PSNR calculator?

It's even more simple, because you don't need to enter any kinds of text.

Just choose original and changed image (there is words "Original" and "Changed" written on purpose)

Then choose if they are grayscale or color and press "Calculate"

Yes, you need to find out are they color or b&w by your own

Wait a sec... Done!

Program will tell is this good result or not really. It's based on stuff, you know.

How to Encode and Decode?

How to encode some?

Step 1 - Choose your image

Step 2 - Write your message under "Input text" words and press "Encode"

Pay attention to the line under the image preview, there you can see how much characters you can encode.

Step 3 - Enter your file name and press "Save"

Congrats! You just become real hacker, buddy!

So, how can you read the secret message, using this program?

Step 1 - It's the same as first step in previous case, with the only difference - choose the image, that contains secret message for you, not just random one.

Step 2 - Press "Decode", then wait a while

Step 3 - Change your name and look, and go to Panama ASAP!