1) Fast, reliable viewing and annotation: Opens large PDFs instantly with smooth rendering, zoom, bookmarks, and page navigation. Includes annotation tools (highlight, underline, comments, stamps, shapes) for easy markups, collaborative review, and exporting annotated files while preserving layout and searchability.
2) Powerful editing and conversion: Edit text and images directly within PDFs, rearrange, insert, delete, split, and merge pages. Built‑in OCR converts scans to editable text, and export options (Word, Excel, images) simplify repurposing content without losing formatting.
3) Security, signing, and cloud integration: Protect documents with password encryption and redaction, apply digital signatures, and set permissions. Built‑in compression reduces file size for sharing, while seamless cloud and email integration enables secure syncing, backup, and one‑click sharing across devices.
1. Limited advanced editing and export features: The app often lacks professional tools like precise redaction, batch processing, layer handling, form creation, and high-fidelity export. Complex edits require workarounds or external software, causing formatting loss, inconsistent fonts, and reduced control for power users needing robust PDF manipulation.
2. Performance and stability problems: Large, scanned, or multimedia-rich PDFs can load slowly, stutter during navigation, or cause crashes. Rendering complex pages, embedded fonts, or high-resolution images may consume excessive memory and CPU, making the app sluggish on older devices and interrupting productivity during critical editing or review sessions.
3. Privacy and security concerns: Some versions require cloud uploads or broad permissions, exposing sensitive documents to third-party servers. Encryption and access controls may be limited or inconsistently applied, increasing risk of unauthorized access or data leakage—particularly problematic for confidential contracts, medical records, or corporate files.
