Digital Sign PDF

Add a cryptographic digital signature to your PDF documents directly in the browser. Unlike visual signatures (drawing your name), digital signatures use public-key cryptography to create a tamper-evident seal that proves the document has not been modified after signing. This is essential for contracts, regulatory submissions, certified documents, and any workflow requiring non-repudiation. Recipients can verify the signature to confirm the signer's identity and document integrity. Our tool processes everything locally via WebAssembly, so your private keys and sensitive documents never leave your device.

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