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2. Best Free PDF Editors of 2023 - AOL

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

   The Pro version, starting at $19 per month, allows you to work on 30 PDFs, and adds text editing capabilities and more. ... Google doesn't offer a free PDF editor. But you can edit files in Google ...

3. List of PDF software - Wikipedia

   en.wikipedia.org/wiki/List_of_PDF_software

   LibreOffice. Free ( Mozilla Public License) an Office suite; allows to export (and import, with accuracy limitations) PDF files. Microsoft Word 2013. Proprietary. Desktop software. The 2013 edition of Office allows PDF files to be converted into a format that can be edited. Nitro PDF Reader.

4. Image intensifier - Wikipedia

   en.wikipedia.org/wiki/Image_intensifier

   An image intensifier or image intensifier tube is a vacuum tube device for increasing the intensity of available light in an optical system to allow use under low-light conditions, such as at night, to facilitate visual imaging of low-light processes, such as fluorescence of materials in X-rays or gamma rays (X-ray image intensifier), or for conversion of non-visible light sources, such as ...

5. Computer vision syndrome - Wikipedia

   en.wikipedia.org/wiki/Computer_vision_syndrome

   Computer vision syndrome. Computer vision syndrome ( CVS) is a condition resulting from focusing the eyes on a computer or other display device for protracted, uninterrupted periods of time and the eye's muscles being unable to recover from the constant tension required to maintain focus on a close object.

6. Category:Free PDF software - Wikipedia

   en.wikipedia.org/wiki/Category:Free_PDF_software

   Category. : Free PDF software. This is a category of articles relating to free software for making or viewing Portable Document Format (PDF) documents. That is, software which can be freely used, copied, studied, modified, and redistributed by everyone that obtains a copy. Typically, this means software which is distributed with a free software ...

7. Sumatra PDF - Wikipedia

   en.wikipedia.org/wiki/Sumatra_PDF

   The Sumatra PDF Viewer is a tiny open source portable reader that opens PDF's in the blink of an eye. Bloat and startup time is a major drawback to Adobe Reader, so we fled to the faster arms of Foxit Reader long ago. However, at 850KB, Sumatra is way slimmer than FoxIt. ^ Anders Ingeman Rasmussen (2008).