Sign PDF
Add digital signatures to your PDF documents
Upload PDF
Signed PDF
Upload a PDF and fill in signature details to sign it
Related Tools
PDF Info
Extract metadata and information from PDF files including page count, author, and creation date
Extract Text
Extract text content from PDF files for analysis and processing
Merge PDFs
Combine multiple PDF files into a single document
Split PDF
Extract specific page ranges from PDF files
Encrypt PDF
Add password protection to secure your PDF files
Add Watermark
Add text watermarks to all pages of your PDF
About PDF Digital Signature
Add digital signatures to your PDF documents to verify authenticity, ensure document integrity, and provide non-repudiation. Digital signatures are legally binding in many jurisdictions.
Key Features
- Digital Certificate: Automatically generates a self-signed certificate for signing
- Signature Metadata: Includes signer name, reason, location, and timestamp
- Visual Signature: Adds a visible signature box to the first page
- Document Integrity: Ensures the document hasn't been altered after signing
- Instant Processing: Quick digital signature application
How to Use
- Upload PDF: Select your PDF file to sign
- Enter Details: Fill in signer name (required) and optional information
- Sign Document: Click "Sign PDF" button to apply digital signature
- Download: Download your digitally signed PDF
- Verify: Recipients can verify the signature using PDF readers
Signature Information
- Signer Name: Your name or organization name (required)
- Reason: Purpose of signing (e.g., "Approval", "Review", "Certification")
- Location: Geographic location where signing occurs
- Contact Info: Email or phone number for verification (optional)
- Timestamp: Automatically added with current date and time
Common Use Cases
- Contracts & Agreements: Legally sign business contracts
- Approvals: Sign off on documents requiring authorization
- Certifications: Certify document authenticity
- Legal Documents: Sign legal forms and declarations
- Financial Documents: Sign invoices, receipts, and statements
- Academic Papers: Sign research papers and dissertations
Digital Signature vs Electronic Signature
- Digital Signature: Uses cryptographic certificates and provides higher security
- Electronic Signature: Simple signature image or text without cryptographic verification
- Legal Validity: Digital signatures are legally binding in most countries
- Tamper Detection: Digital signatures can detect if document is modified after signing
Technical Details
- Uses RSA 2048-bit key pair for cryptographic signing
- Generates self-signed X.509 certificate valid for 1 year
- Adds signature metadata to PDF document properties
- Creates visible signature annotation on first page
- Compatible with Adobe Acrobat and other PDF readers
Privacy & Security
Your PDF files are processed securely on our servers. Files are not stored permanently and are deleted immediately after processing. The digital certificate is generated uniquely for each signature and is not reused.
Important Notes
- This tool generates self-signed certificates suitable for internal use
- For legally binding signatures in regulated industries, use certificates from trusted Certificate Authorities (CAs)
- The signature includes a timestamp to prove when the document was signed
- Recipients can verify the signature but may see a warning about the self-signed certificate