Pixelfreak.at

Open the Image where you want to have your pixel stretch,

I’ve used this one:

Now select the Single Column Marquee Tool

Select a single line on your image to stretch

Go to edit > copy or press ctrl + c

Create a new layer

Go to edit and paste or press ctrl + v, then go to edit > free transform or press ctrl + T

Now stretch your selection to the left or right

Mine looks like this now:

Done!