On a related note to How do I make my document look like it was written by a Cthulhu-worshipping madman?, I want to create a LaTeX command that blurs the text so it's unreadable.

Unfortunately, whatever I google to get ideas on how to do this, I find forum posts from everyone and his aunt having problems with the fonts being blurry. Nothing about how to get there...

  • Extra points: make it unsearchable/uncopyable. – Andrestand Sep 16 '14 at 11:29

Using a variation of the technique Dissecting paragraphs with \lastbox described in Section 5.9.6 of TeX by Topic, you can produce a blur effect; the idea is to use two copies for each line and typeset the line and its copies superimposed:


  \box\slinebox \fi





enter image description here

In a comment, doncherry suggested horizontally shifting the layers to decrease legibility; this can be done using this definition of \duplines:


and defining \BlurText as before, here's the new result of \BlurText{\lipsum[1]}:

enter image description here

And a little modification using some color:


and in \duplines:


enter image description here

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    Note: Some packages use similar technique to get fake bold font. e.g. \pmb from amsbsy and \CJKbold from CJK. – Leo Liu Nov 29 '11 at 18:35
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    That should carry a health warning! – Loop Space Nov 29 '11 at 18:39
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    Any Cthulu worshiping madman would be proud of this document. – doncherry Nov 29 '11 at 18:47
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    I can still read this just fine, but I do worship Chutulu regularly.. – N3buchadnezzar Nov 29 '11 at 20:26
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    @Gonzalo: Is it possible to shift one or two layers of text horizontally as well? This might decrease legibility further. (What a thing to say in a TeX community ... :) – doncherry Nov 29 '11 at 20:34

Here is a TikZ-solution.

\draw [black!#1] node at (#2,#2) {#3};
\draw [black!#1] node at (0,#2) {#3};
\draw [black!#1] node at (#2,0) {#3};
\draw [black!#1] node at (-#2,#2) {#3};
\draw [black!#1] node at (-#2,0) {#3};
\draw [black!#1] node at (0,-#2) {#3};
\draw [black!#1] node at (#2,-#2) {#3};
\draw [black!#1] node at (-#2,-#2) {#3};

\draw [black!40] node at (0,0) {#1};

For example:

\blurry{This text is a little bit blurry.}

blurry example

In order to strengthen the blur effect, you will have to play with the numbers in the \blurry-command.

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