Add a digital signature to a PDF document

Ensure the integrity and verify the authenticity of a PDF file by digitally signing it
The RSA algorithm for asymmetric cryptography involves a pair of keys consisting of a public key and a private key that correspond to each other. One is used to digitally sign a PDF file and the other one is used to verify the digital signature.
The RSA algorithm for asymmetric cryptography involves a pair of keys consisting of a public key and a private key that correspond to each other. One is used to digitally sign a PDF file and the other one is used to verify the digital signature.
The RSA algorithm for asymmetric cryptography involves a pair of keys consisting of a public key and a private key that correspond to each other. One is used to digitally sign a PDF file and the other one is used to verify the digital signature.
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  Insert a digital signature on a PDF document
  Verify a digital signature
  Generate your own RSA key pair
* Our company provides an RSA key pair for free (it is the same pair of keys for all users), but we strongly recommend that you use your own RSA key pair. If you don't have it, you can buy one from HERE for 5 dollars and use unlimited to digitally sign files and messages.
* A certificate of ownership and a digital signature will be created and available for download
  I have my own private key
* Feel free to submit another PDF file with a digital signature to create or verify, or generate a new pair of RSA keys
UPLOADING
How it works
When a PDF file is shared, the author of the document wants to make sure that the file remains unchanged on its way to the recipient. Also, the recipient wants to make sure that the file is shared by the author and not by someone else. That is to say, we need to
  • ensure the integrity of the PDF document being shared, as well as to
  • ensure the authenticity of the person who shares the document
A digital signature is to be (virtually) attached to the PDF file being shared in order to verify the identity/authentication of both the file and its author.
To achieve this we will use the RSA algorithm for asymmetric cryptography. It involves a pair of keys consisting of a public key and a private key that correspond to each other. One is used to digitally sign a PDF file and the other one is used to verify the digital signature.
The public key is publicly available and known to everyone. Unlike the public key, the private key must be kept secret and must not be exposed or shared online.
In order to add a digital signature to a PDF document and sign it digitally, you must
  • provide the private key used to sign the data (unless you use a private key provided by default, yet it is strongly recommended that you have your own RSA key pair)
  • provide basic information about the PDF file (title, author's name, company name) and this information will be stored in a QR code along with the digital signature itself
  • upload the PDF file that the digital signature will be created upon
Once the task is completed, you will be able to download your certificate of ownership.
How to physically embed a digital signature in a PDF file
Digital watermarking (fingerprinting, stamping, or sealing) refers to adding an invisible and unobtrusive watermark to your PDF file as a globally unique identifier and copyright protection tool. For more details, please visit this page.
How to add an electronic signature to a file
Also try our online tool that allows you to create an electronic signature by drawing with your mouse or fingers on the canvas on your mobile phone, tablet or computer in real time. Using e-signatures will help you save time and money by allowing you to sign a contract on the fly, assign a signature to an e-mail, or get your work authenticated with your personal data in digital format.
Learn more about the difference between an electronic and a digital signature.
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