: A completely free PDF editor for Windows and Mac that includes OCR and editing capabilities with no watermarks or registration required. LibreOffice Draw

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: An open-source desktop application focused on merging, splitting, and rotating PDF files offline.

: The standard free version allows for basic tasks like merging, splitting, and limited compression without a subscription. Top 100% Free & Open-Source Alternatives

: A powerful command-line tool for decrypting or removing restrictions from PDFs (useful for files where you have the password but want to remove it permanently). Built-in Free Tools

: An open-source tool that allows you to edit PDF text and layouts for free. PDFsam (PDF Split and Merge)