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2. List of PDF software - Wikipedia

   en.wikipedia.org/wiki/List_of_PDF_software

   Open source multi-backend library for viewing and manipulating PDF files. Bundled with a viewer with the same name for the X Window System. PDF Studio: Proprietary: Yes Yes Software for viewing and editing PDF documents Inkscape: GNU GPL: Yes Technically not a PDF editor, but can be used as such page by page Adobe Reader: Proprietary freeware Yes

3. Best Free PDF Editors of 2023 - AOL

   www.aol.com/best-free-pdf-editors-2023-204004606...

   There are many PDF editors on the market, including the top-rated Adobe Acrobat Standard and Acrobat Pro, which provide capabilities to convert PDFs, edit them, add e-signatures, and protect the ...

4. List of file signatures - Wikipedia

   en.wikipedia.org/wiki/List_of_file_signatures

   A file signature is data used to identify or verify the content of a file. Such signatures are also known as magic numbers or magic bytes. Many file formats are not intended to be read as text. If such a file is accidentally viewed as a text file, its contents will be unintelligible.

5. Adobe Acrobat - Wikipedia

   en.wikipedia.org/wiki/Adobe_Acrobat

   It is currently available for users with a web browser and an Adobe ID only. Fill & Sign is part of the Acrobat family developed by Adobe to fill, sign, and manage files in a PDF. It is currently available for Windows, macOS, iOS, and Android. Scan is part of the Acrobat family developed by Adobe Inc. to scan, crop, and manage files in a PDF.

6. PDF - Wikipedia

   en.wikipedia.org/wiki/PDF

   PDF 2.0 defines 256-bit AES encryption as the standard for PDF 2.0 files. The PDF Reference also defines ways that third parties can define their own encryption systems for PDF. PDF files may be digitally signed, to provide secure authentication; complete details on implementing digital signatures in PDF are provided in ISO 32000-2.

7. Nitro Pro - Wikipedia

   en.wikipedia.org/wiki/Nitro_Pro

   Nitro Software offers a PDF editor, a browser-based application for electronic signatures, and various PDF productivity tools. Subscription services feature cloud-based user management, deployment, and analytics tools. The company also manages several document conversion websites. Nitro Software's desktop products are compatible with Windows ...