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!