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 FileMaker Pro Custom Functions

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Christian Jaeger, contact: cjaeger @
Hannover, Germany

Easy ROT 13 encoding/decoding function. Uses Recursion.

Sample Input:
Rot13("alea iacta est")
Sample Output:
nyrn vnpgn rfg

 Then copy & paste into FileMaker Advanced's Edit Custom Function window.

Click here to copy To Clip Manager if you have myFMbutler's Clip Manager installed


ROT13 (Caesar-Cipher by 13 chars) is a cipher commonly used in Usenet postings. The term cipher itself might be a bit misleading: The ROT13-algorithm is based on a rotation of all alphabetic characters by 13. Speaking in computer terms the ASCII-values of the letters are incremented or decremented by 13.

In addition to ROT13, ROT5 is often used to encrypt digits, which means that every digit is rotated by 5.

The beauty of the ROT13 is that you can use the same formula to decrypt. This encryption method is found often on Usenet, and you can use it to hide somethings from your kids (if they are under 8 years of age) ;-)

Note: these functions are not guaranteed or supported by Please contact the individual developer with any questions or problems.

This is my Custom Function and I want to edit it


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