With the EDI Viewer you can upload an EDI message and it will be displayed segment by segment with the relevant values for the data elements etc.
Please select an EDI file with extension .txt and only one UNH-UNT message inside. Then click on "View" and the whole message should be displayed. Your data will not be stored on our side, it will just be displayed. There is no general syntax check included, besides checking of UNH for the relevant message structure.
To have an idea how it looks like in general after uploading your data, you can click on the picture on the right hand side.