PDF Toolkit is a comprehensive PDF and image manipulation tool for Android. Features include: * Merge multiple PDFs into one * Split PDF into multiple files * Compress PDF to reduce file size * Convert PDF pages to images * Convert images to PDF * Reorder, rotate, and delete PDF pages * Extract specific pages from PDF * Add watermarks and page numbers * Password protect PDFs (lock/unlock) * Sign PDFs with digital signatures * OCR using Tesseract (open source) * Scan documents to PDF using camera * Extract text from PDFs * View and edit PDF metadata * Image tools (compress, resize, convert formats) The F-Droid version uses Tesseract OCR instead of Google ML Kit to maintain compatibility with F-Droid's free software requirements.