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PDFacil

An easy PDF viewer for Windows (fácil: 'easy', in Spanish)

Version 1.0.0 · November 2026 · Created by Uri Simonsohn with Claude Opus 5.5

PDFacil is a Windows PDF viewer designed for researchers who read papers in PDF format. The Home menu on top has all the tools one needs:

The PDFacil Home menu: Open, Save, Print, Delete Page, Rotate Left, Rotate Right, Select, Highlight, Text, Comment, Outline, Thumbnails

The Home menu

Download PDFacil Version 1.0.0 · zip file, about 150 MB · Windows 10 and 11 (64-bit)

Installation

  1. Download the zip file above.
  2. Unzip it.
  3. No install needed: just run PDFacil.exe inside the unzipped folder. Keep all the files in that folder together.

The first time you run it, Windows may say "Windows protected your PC", because the app is not code-signed. Click More info, then Run anyway.

Make PDFacil your default PDF viewer

  1. Right-click any PDF file.
  2. Choose Open with > Choose another app.
  3. Browse to PDFacil.exe, select it, and tick Always.

Open source

The source code of PDFacil is on GitHub:

https://github.com/urisohn/PDFacil
View on GitHub