Especially if you have an embedded system that acts as a web server, you will want to display the pictures without using special software. This also perfor for sites where you can not upload anything besides html Here is a quick trick to turn a picture into a simple ascii html file which you can easily edit. Lets take the file switch.png.
But we need a file in the .jpg format. No problem we can convert it with
$ convert switch.png switch.jpg
Still looks pretty much the same so far. Now to create the html file.
$ jp2a --color --html --fill --background=light switch.jpg --output=s.html
We will use a simple web text only browser to display the html file.
Now to try a regular web browser on a normal desktop system.