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Nivo PDF

Digital signature

Sign a PDF cryptographically with your certificate (.p12/.pfx).

Runs in your browser — files never leave your deviceInput: PDFOutput: PDF

or drag and drop a file here

PDF

About Digital signature

Creates a standard PKCS#7 signature that Acrobat and other readers can verify. Signing happens in your browser — your private key never leaves your device. No certificate? A self-signed one can be generated (identity shown as unverified).

How it works

  1. Add your pdf — drag and drop or browse.
  2. Choose your settings.
  3. Click the action button and wait a moment.
  4. Download the result. Nothing was uploaded.

Good to know

  • RSA certificates only (ECDSA keys aren't supported).
  • No timestamp authority (TSA) or long-term validation (LTV) data is embedded.

Related tools

Verify signaturesCheck whether a signed PDF was changed after signing and who signed it.Sign PDFDraw, type or upload your signature and place it on the document.Protect PDFAdd a password with AES-256 encryption.Restrict permissionsPrevent printing, copying or editing while the PDF still opens without a password.