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Secure your documents with confidence using PDFSmith, a fast and privacy-first PDF security tool that lets you lock PDFs, unlock PDFs, add passwords, remove password protection, and change PDF passwords — all fully offline on your device. No uploads. No cloud processing. Your files never leave your phone. Unlock Password-Protected PDFs Remove password protection from PDFs when you know the correct password Instantly unlock PDFs for viewing, editing, or sharing Password is required — PDFSmith does not bypass or crack encryption Lock PDFs with a Password Add a password to unprotected PDF files Secure sensitive documents before sharing Protect PDFs instantly with strong encryption Fast, Offline & On-Device 100% offline PDF processing No internet connection required Instant results with no waiting Privacy-First by Design Files are processed entirely on your device No uploads to servers No data collection or tracking Save & Share Easily Save locked or unlocked PDFs instantly Share securely using your device’s share options Perfect For Professionals handling confidential documents Students and educators Travelers and offline environments Anyone who values privacy and control Key Features Lock PDF with password Unlock PDF with password Add password to PDF Remove password from PDF (password required) Offline PDF security On-device PDF processing PDFSmith delivers professional-grade PDF security — fast, private, and completely under your control.