← Back to tools
Sign PDF
Certificate signing is not available in the local-only app.
Not available locally: PKCS#12 certificate signing needs server-side cryptography and is not supported in this local-only app. Use image-based signing in Edit PDF, or protect documents with password encryption instead.
Digital Certificate Requirements
What you need to digitally sign your PDF documents
Supported Certificate Formats:
- • .p12/.pfx - PKCS#12 certificates (most common)
- • .crt/.cer - X.509 certificates
- • .pem - PEM-encoded certificates
Security Features:
- • Cryptographic signature validation
- • Certificate chain verification
- • Timestamp authority support
- • Long-term validation (LTV)
Note:
Certificate-based signing is not available in this local app. Use the Edit PDF tool for image-based signature stamps, or use dedicated desktop software for cryptographic signing.
Sign Your PDF Document
Upload your PDF and certificate to create a digitally signed document
Drag & drop a PDF file here, or click to select
PDF files only
Drag & drop a certificate file here, or click to select
.p12, .pfx, .crt, .cer, .pem files
Required for PKCS#12 (.p12/.pfx) certificates