Thai Romanization is a simple application that allows you to romanize text in Thai in order to be understood more easily. In case you are not familiar with this word, romanization means transforming a script into the Latin alphabet. With this program, you can easily enter any word or phrase or even an entire text to be romanized. Once the text is romanized, you can easily copy both the Thai and Roman text by pressing the Copy button to use them somewhere else. The application supports two character encodings: Windows-874 and Unicode. You can also customize the Thai font, and set the program to show the pronunciation and the romanized text all capitalized.
What is more, the program is very easy to use (although the user interface is not really attractive).
Unfortunately, I'm not in a position to know if the program does a good work because I don't speak Thai. I know that the romanization of this language has always been complicated, so I think you should try it and see if it actually works.