PDF Sign: Digital Signature

PDF Sign & Verify is your all-in-one solution for signing PDF documents, creating digital signatures, and cryptographically verifying document authenticity right from your Android device.

Whether you need to sign a business contract, complete a lease agreement, fill out forms, or verify if an official document was digitally signed and untampered, our app delivers desktop-grade digital signature tools in a fast, lightweight, and modern mobile experience.

--------------------------------------------------
✨ KEY FEATURES
--------------------------------------------------

🖋️ EASY & SECURE PDF SIGNING
• Create your personalized signature with smooth, high-precision fingertip drawing.
• Save your favorite signatures and initials for instant reuse across multiple documents.
• Place and resize your signature anywhere on any page of your PDF file.
• Add custom text, dates, and stamps with ease.
• Export, save, and share your signed PDF documents instantly.

🛡️ CRYPTOGRAPHIC DIGITAL SIGNATURE VERIFICATION
• Verify digital signatures using industry-standard PKCS#7 / CMS cryptographic validation.
• Instantly detect if a document has been modified, altered, or tampered with after being signed.
• Full ByteRange coverage analysis: verify if the signature protects the entire document or a specific revision.
• Fast visual status indicators: Valid (Intact), Unknown Trust, or Invalid/Tampered.

🔍 DEEP X.509 CERTIFICATE INSPECTION
• View comprehensive signer details including Common Name (CN), Organization, and Country.
• Inspect Certificate Issuer details and certificate validity windows (Start & Expiry dates).
• Check public key algorithms (RSA 2048/4096, EC) and SHA-256 digital fingerprints.
• Distinguish between trusted Certificate Authorities (CAs) and self-signed certificates.

📖 BUILT-IN PDF VIEWER & READER
• High-performance, smooth PDF reading and zooming.
• Support for multi-page documents and jump-to-page navigation.
• Open and view password-protected / encrypted PDF files securely.
• Clean, modern Material Design interface with Dark Mode support.

🔒 100% PRIVATE & OFFLINE
• Your privacy is our top priority.
• All document rendering, signing, and cryptographic signature verifications are processed 100% locally on your device.
• Your confidential documents and private signatures are never uploaded to any remote server or third-party cloud.

--------------------------------------------------
🎯 PERFECT FOR:
--------------------------------------------------
✔ Business Professionals & Freelancers signing contracts, NDAs, and agreements.
✔ Human Resources & Job Seekers signing offer letters and onboarding paperwork.
✔ Real Estate & Legal Teams validating official digitally-signed certificates.
✔ Students & Teachers filling and signing school forms, applications, and permissions.
✔ Anyone needing to verify official e-signed invoices, tax forms, and government certificates.

--------------------------------------------------
🚀 WHY CHOOSE PDF SIGN & VERIFY?
--------------------------------------------------
Traditional mobile signers only paste a picture of your signature. PDF Sign & Verify goes beyond by combining visual e-signing with genuine cryptographic signature verification, giving you confidence that your documents are authentic, legally sound, and tamper-free.

Download PDF Sign & Verify today and experience the smartest, safest way to sign and verify PDFs on Android!