The world according to Robin

A techno-related blog with tips and tricks, and the occasional rave about… anything!

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Add images or text to a pdf

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A common situation is the need to add/overlay images, text, or whatever to an existing pdf called original.pdf, for example your signature. In Linux, this is quite simple by using a technique where you stamp one pdf onto another. I will use Ubuntu to demonstrate: Create a pdf called stamp.pdf with the stuff you want […]

After an upgrade to WordPress 3.5, I could not add hyperlinks when writing a blog post, nor could a change to the Text editor from the Visual editor. It turns out that my theme, Arjuna X, somehow breaks this functionality. To fix it, see this blog post:

Welcome to my blog, an informal account of mostly techno-related stuff but anything I find worth writing about will be posted here. If you are looking for my professional details, CV, research, and publications, please see my main site at