Digital Signature
Add X.509 digital signatures to PDF documents. Sign PDFs with PFX, P12, or PEM certificates for legal validity.
Trageți și plasați fișierele aici, sau faceți clic pentru a răsfoi
or
Trageți și plasați un fișier PDF aici, sau faceți clic pentru a răsfoi.
Designed for Trust and Speed
PDFRunway handles your documents locally, keeping data secure and processing lightning-fast.
Easy to Use
Simple 3-step processes designed for speed, clarity, and non-technical users.
Fast & Reliable
High-performance local compilation keeps processing fast, secure, and responsive.
100% Secure
Your documents never leave your browser. Zero uploads, 100% client-side privacy.
Works Anywhere
Access the full suite on any browser, system, desktop, or mobile device.
Cum se utilizează
Follow these three simple steps to process your file in seconds.
Upload PDF
Upload the PDF document you want to digitally sign.
Load Certificate
Upload your X.509 certificate file (.pfx, .p12, or .pem) and enter the password.
Configure Signature
Optionally add reason, location, and visible signature with custom text or image.
Sign and Download
Click Sign PDF to apply the digital signature and download the signed document.
Despre acest instrument
Digital Signature allows you to add cryptographic X.509 digital signatures to PDF documents. Unlike simple drawn signatures, digital signatures provide legal validity and document integrity verification.
Upload your certificate file (PFX, P12, or PEM format), enter the password, and sign your PDF. You can add visible signatures with custom text, images, and positioning, or invisible signatures for document integrity only.
All signing happens locally in your browser. Your certificate and documents are never uploaded to any server.
Cazuri de utilizare
Legal Documents
Sign contracts, agreements, and legal documents with legally binding digital signatures.
Business Approvals
Digitally sign invoices, purchase orders, and approval documents for audit trails.
Document Integrity
Ensure documents have not been tampered with after signing.
Întrebări frecvente
Have questions? Find quick answers about this tool here.
PFX (.pfx), PKCS#12 (.p12), and PEM (.pem) certificate formats are supported.
Yes, X.509 digital signatures are legally recognized in most jurisdictions when using a valid certificate.
Yes, you can add a visible signature with custom text, image, position, and styling.