ඩිජිටල් අත්සන

For most everyday documents, an electronic signature is sufficient. But for regulated industries, cross-border legal agreements, government filings, and any document where you need to prove that specific person signed a specific version of a specific document at a specific moment in time, a certificate-based digital signature is what the law and the standard require. Dokk.ai's Digital Sign tool implements PKI-based PDF signatures using PKCS#7/CMS (PAdES format), the standard mandated by EU eIDAS for Advanced and Qualified Electronic Signatures. When you sign a document, the tool creates a cryptographic hash of the PDF content, encrypts it with your private key, and embeds the signature along with your public certificate in the PDF. Any PDF reader can verify this signature independently by decrypting the hash with your public key and confirming it matches the current document state. This architecture makes the signature verifiable by anyone, offline, without trusting Dokk.ai or any intermediary. A modified document fails verification immediately — even a single changed character invalidates the signature. This tamper-evidence is what distinguishes digital signatures from scanned signatures or drawn e-signatures. Dokk.ai supports multiple signing scenarios. Upload your own PKCS#12 (.p12 or .pfx) certificate from a qualified trust service provider. For organisations without individual certificates, the platform supports signing with organisation-level certificates. A trusted timestamp from an RFC 3161 timestamp authority is applied by default, cryptographically proving the signing time. After signing, use the Flatten tool to merge visual signature representation into the page, or Encrypt PDF to add a password layer. Fill & Sign handles the earlier document completion step if the document is also a form. Certificate management settings let you store and manage your certificates for reuse across multiple signing sessions. All private keys are processed in memory only and never written to disk or stored in any form.