You can use this frontend for Lingua::Translit to transliterate natural language text from one writing system to another online. Simply type or paste your text into the field, choose a standard and click the "Transliterate!" button.
If you are unsure what standard to chose or wether it is reversible, have a look at the Supported Standards.
The amount of input accepted by this online frontend is limited to 50.00 KiB, 100 visits per day and user are allowed.