Digital signatures

Docotic.Pdf can sign PDFs with digital signatures and can check if the signed part of a document was changed after signing.

Digital signatures resources

You can sign documents with digital signatures. It is possible to sign already signed documents without invalidating existing signatures. You can specify which fields to lock after signing. The library supports embedding timestamps in digital signatures.

Docotic.Pdf can read signature properties, check if the document was tampered with after signing, check if the signature certificate is revoked.

Docotic.Pdf library 9.4.17467-dev Regression tests 14,760 passed Total NuGet downloads 4,415,970


Check the articles about features of the library related to digital signatures.

Sample code

These sample codes illustrate different approaches to signing documents with digital signatures.