• OCRmyPDF - adds an OCR text layer to scanned PDF files, allowing them to be searched or copy-pasted
    • macOS (Homebrew) - brew install ocrmypdf
    • …will include the English, French, German and Spanish language packs. If you need other languages you can optionally install them all: brew install tesseract-lang
    • ocrmypdf -l eng+rus --force-ocr input_scanned.pdf output_searchable.pdf
  • Stirling-PDF - a robust, locally hosted web-based PDF manipulation tool using Docker
  • Pdfgear - read, edit, convert, merge, and sign PDF files across devices, for completely free and without signing up

What is the best free alternative to Adobe Acrobat (pro)?