Sign PDFs through OTP

Get high-quality electronic sign pdfs quickly, easily and securely using the OTP’s user-friendly 4SL platform.



  • Signature through OTPs is the secure way to sign important documents.
  • 4SL provides the feature to sign the documents and keep a record of the signatures and recipients. For example, in an organization, there are different departments where the documents need to be signed. Through the 4SL platform, you can make a PDF template and send it to the contacts. Then the receiver will receive the template with the OTP to their email or SMS. After putting the correct OTP generated by 4SL, the e-Signature will be implemented on the document.
  • In this way, the 4SL will keep track of the documents with the signatures. And the process will save more time.