Tumblr coding is fairly easy to pick up compared to other more complex blogging systems.  This article will give you an insight into the code and structure about converting a PSD to Tumblr. Tumblr allows its users to create custom themes giving the owner of a Tumble blog the ability to truly customize their Tumble blog to be their own. Tumblr uses a single page of HTML, with the CSS and scripts in the head of the file.

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Here you can find more PSD to Tumblr tutorials