PDF Gremza

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Features

• Tabs in the top bar — open many PDFs side by side, drag a tab left or right to change the order; tabs that don't fit go into a » overflow menu
• Page thumbnails sidebar — drag to reorder pages, right-click for page actions, Delete removes a page
• Zoom: zoom in/out, fit width, fit whole page, actual size (100%)
• Layouts: single page, continuous, two pages, two pages continuous
• Rotate pages left / right
• Full Screen Mode — only the page, on black, without bars or borders; turn pages like a presentation with the arrow keys, Space, Page Up / Page Down or a click (right-click goes back); Esc exits
• Search text inside the document
• Edit pages: delete, rotate, insert blank pages, insert pages from other PDFs, merge PDFs, with undo
• Save / Save As — changes are only written when you save; unsaved tabs show ● and ask before closing
• Extract pages (e.g. 1-3, 5) into a new PDF, or split every page into its own PDF
• Export to Word (.docx) — the text of the PDF, with paragraphs, bold/italic and font sizes
• Export to JPG — saves every page as an image (1.jpg, 2.jpg, …) in a new folder named after the PDF
• Updates — checks GitHub for a new version at launch and once a day; installs it automatically or asks first (Check for Updates…, Check for Updates Automatically, Install Updates Automatically in the app menu on macOS and the Updates button on Windows)
• Keyboard shortcuts like Adobe Acrobat Reader, shown next to the menu items
• On macOS every action is also in the menu bar (File, Edit, View, Pages)
• Open via ⌘O, drag & drop, the Dock icon, or Finder's Open With
• No tracking, no accounts; the only network access is the update check (it can be turned off)

The macOS app is native (SwiftUI + PDFKit); the Windows app is built with Electron and pdf.js and has the same features.

Keyboard shortcuts

The same as in Adobe Acrobat Reader.

Action	macOS	Windows
Open PDF(s)	⌘O	Ctrl+O
Close tab	⌘W	Ctrl+W
Next / previous tab	⌘⇧] / ⌘⇧[	Ctrl+Tab / Ctrl+Shift+Tab
Next / previous page	→ / ← (or Page Down / Page Up, e.g. from a presentation remote)	→ / ← (or Page Down / Page Up, Ctrl+Page Down / Ctrl+Page Up)
First / last page	Home / End	Home / End
Go to page	⌘⇧N	Ctrl+Shift+N
Zoom in / out	⌘= / ⌘−	Ctrl+= / Ctrl+− (or Ctrl + mouse wheel)
Actual size	⌘1	Ctrl+1
Fit page / fit width	⌘0 / ⌘2	Ctrl+0 / Ctrl+2
Rotate left / right	⌘⇧− / ⌘⇧=	Ctrl+Shift+− / Ctrl+Shift+=
Full Screen Mode	⌘L	Ctrl+L (or F11)
Show / hide thumbnails	F4	F4
Search	⌘F	Ctrl+F
Find next / previous	⌘G / ⌘⇧G	Ctrl+G / Ctrl+Shift+G (or F3 / Shift+F3)
Insert pages from PDF	⌘⇧I	Ctrl+Shift+I

In Full Screen Mode: → ↓ Space Page Down Enter or a click for the next page, ← ↑ Shift+Space Page Up Backspace or a right-click for the previous one, Home / End for the first / last page, Esc to exit.

Install

macOS

Grab PDF-Reader.zip from the latest release, unzip it and move PDF Gremza.app to /Applications.

The app is signed and notarized by Apple, so it opens normally (the first time macOS only asks to confirm opening an app downloaded from the internet).

Windows

Grab PDF-Reader-Setup-<version>-x64.exe from the latest release and run it (or use PDF-Reader-Portable-<version>-x64.exe, which runs without installing). The installer registers PDF Gremza under Open with for .pdf files.

The app is not code-signed, so Windows SmartScreen may warn the first time: click More info → Run anyway.

Build from source (macOS)

Requires macOS 14+ and Xcode 15+ (or the Swift toolchain).

git clone https://github.com/Gremza/pdf-reader-free.git
cd pdf-reader-free
./build.sh

build.sh compiles a release build, creates build/PDF Gremza.app and copies it to /Applications.

The logo is Resources/AppIcon.svg. After changing it, regenerate the macOS, Windows and website icons with swift Tools/make_icon.swift

Build from source (Windows)

Requires Node.js 20+. Works on Windows, macOS or Linux.

cd windows
npm install
npm start            # run in development
npm run dist         # build the x64 installer + portable exe into windows/dist/
npm run dist:arm64   # same for Windows on ARM

Project structure

Sources/PDFReader/
  PDFReaderApp.swift   App entry, file opening, quit confirmation
  MenuCommands.swift   File / Edit / View / Pages menu bar items
  TabsModel.swift      Open documents / tabs, unsaved-changes prompts
  TopBar.swift         Tab strip with overflow + toolbar controls
  ContentView.swift    Window layout, empty state, drag & drop
  PDFViewModel.swift   Navigation, zoom, layouts, search, page edits, undo, save, export
  ThumbnailSidebar.swift  Thumbnails: reorder by drag, page context menu
  WordExport.swift     PDF text → paragraphs → .docx
  PDFKitViews.swift    PDFView wrapper
  WindowChrome.swift   Hidden title bar, traffic light positioning
Resources/             Info.plist, app icon
Tools/make_icon.swift  Makes every app icon from Resources/AppIcon.svg

windows/src/
  main.js              Electron main process: window, file opening, single instance
  preload.js           Bridge between the window and the main process
  index.html           Top bar, empty state
  renderer.js          Tabs, navigation, zoom, layouts, rotation, search, thumbnails
  styles.css           Light / dark theme

Contributing

Issues and pull requests are welcome.

License

MIT © 2026 Marsel Preci