Photojoiner.net is an online tool that let you join multiple pictures together easily without need for registering an account.
I so much like the homepage interface of the website, it’s simple and easy that is only has the “select” button that enable one specified pictures / photos one want to join together.
Select the photos you want to merge together
Choose the style pattern you did like between vertical and horizontal
Select whether to re-size to smallest or largest dimension as possible
Specified the margin length if you want any
Click Join Photos button and you are done