Files with JTD extension are associated with Ichitaro, a word processor developed by Japanese company JustSystems. Ichitaro is the seconds most popular word processor in Japan, with Microsoft Word taking the first spot. Ichitaro is also widely used in other Asian countries.

JTD files store documents created using Ichitaro. JTD is a standard text document that beside text supports graphics, charts, tables, etc. Users can save their work in JTD files are resume it later.