Hi Refaat,
Syncfusion Greetings!
Currently, document editor doesn’t provide support to add digital signatures. We have logged the feature request for your requirement. We will implement this feature in any of our upcoming releases. We usually have an interval of at least three months between releases. The feature implementation would also greatly depend on the factors such as product design, code compatibility and complexity. We will update you when this feature has been implemented.
The tracking the status of your request can be done through the below feedback link.
For workaround solution, please check comments section in above feedback. Using EJ1 signature control, create signature, insert signature as image in Documenteditor.
Please let us know if you have any questions.
Regards,
Suriya M.