FlipScript.com and Ambigram.Matic.com are two free online ambigram generators. FlipScript.com ambigrams have a more professional touch, although they display a watermark. Users may purchase a watermark-free, high-resolution image of the ambigram at the FlipScript.com website. Ambigram.Matic.com ambigrams are completely free.
An ambigram is a calligraphic design whose elements retain meaning when viewed from a different perspective. It may either display the same word in every perspective or form new words. Complex ambigrams may even form full sentences. In principle, any typographic font is apt to create an ambigram.
Ambigrams are usually created with vector design computer programs. A tutorial on how to create an ambigram using Adobe Illustrator is available at DezignMusings.com.