Cryptographically sign a PDF with your PKCS#12 certificate (.p12/.pfx) without uploading the document or private key to BAOI.
Tools
PDF · Digital signature
Cryptographically sign a PDF
Use your PKCS#12 certificate (.p12/.pfx) to add a PKCS#7/CMS digital signature to the document.
Local cryptographic signature. This version does not add TSA timestamping or LTV.
Privacy
The PDF, certificate and passwords stay in your browser. BAOI does not upload them to its server. OCR only loads the engine and language data from a CDN.
FAQ
Questions about this tool
What should I verify before digitally signing a PDF?
Keep an untouched original and confirm the intended security or identity parameters before producing the final file.
Will every PDF viewer enforce or display the result the same way?
No. Viewer support varies, especially for signatures, permissions and encryption features. Test with the viewers used by recipients.
What should I check afterwards?
Reopen the generated PDF, verify pages and content, then confirm the protection or signature state in an independent viewer.
Before you digitally sign
Digitally signing a PDF adds a cryptographic signature based on a certificate; it is different from placing an image of a handwritten signature. BAOI uses a local PKCS#12/PFX signing workflow and this tool version does not add TSA timestamping or LTV.
Safe signing workflow
Use the intended PKCS#12/PFX certificate and confirm the signer identity and certificate validity before signing.
Protect the certificate password and avoid uploading the certificate or password to unrelated third-party services.
Choose the final PDF version before signing because later document modifications can invalidate the signature.
After download, open the signed PDF in a validator/viewer and inspect signature integrity, signer certificate and modification status.
How to validate the signed PDF
The PDF viewer must report that document bytes covered by the signature have not changed and the certificate chain/status should match the trust model you expect.
What the signature proves
Keep the signed document hash, signer certificate subject/issuer/serial as appropriate and the validation status. A visible mark alone is not proof of a cryptographic signature.
Frequently asked question
Does this tool provide a qualified timestamp or LTV?
No. The current BAOI digital-signature tool performs local cryptographic signing but does not add TSA timestamping or Long-Term Validation data.