It is possible to use the checker tool from the Urkund website
The first time you access it, you must accept Urkund’s conditions. After that, you should set up your email address by writing your name and surname.
Once done it, a new window pops up and in the top right you will see the option to upload the files that are to be analysed. You have to choose the email address suggested in the list just above “analysis address”. Once you have attached the document, click “send”.
The analysis feedback can take a while. You will receive notification in the UdL email to let you know that the analysis is ready and available in Urkund.
In case of doubt, you can check this link with the official Guides & tutorials