InstantSign PDF - Private & Offline Signer

Sign PDF documents, add your signature, name, ID and date 100% locally without uploading files to any server.

InstantSign PDF is the ultimate privacy-first tool to sign, fill, and stamp PDF documents directly in your browser — 100% offline and client-side. No subscriptions, no account required, and zero file uploads. Your confidential files never leave your computer. ✨ KEY FEATURES: • 🔒 100% Client-Side Privacy: All cryptographic and PDF rendering operations run locally in your browser. No files are ever sent to external servers or cloud storage. • ✍️ Flexible Signatures: Draw your handwritten signature smoothly or type your name with professional signature typography. • 📝 Smart Metadata Fields: Easily place your full name, ID/DNI/Passport number, and current date anywhere on the document. • 📄 Multi-page Support: Effortlessly navigate through multi-page PDF files and place your signature on any page. • 🎯 Drag, Resize & Position: Intuitive visual editor to scale and precisely align your signature and stamps. • ⚡ Fast & Lightweight: Opens instantly from your Chrome toolbar and processes documents in seconds. • 🌐 Multi-language Support: Available in English, Spanish, and Chinese. 💡 HOW TO USE: 1. Click the InstantSign PDF icon in your browser toolbar. 2. Drag & drop your PDF document or test it with our built-in sample document. 3. Draw or type your signature, and toggle your name, ID, or date stamps. 4. Position and size your fields on the desired page. 5. Click "Sign & Download PDF" to save your signed document immediately. 🔒 PRIVACY & SECURITY: Unlike traditional online PDF signing services that upload your sensitive contracts and legal documents to third-party servers, InstantSign PDF runs entirely inside your browser's local sandbox. It works completely offline without needing an active internet connection.