DocviewWPF

Windows multi-tab document app (.NET Framework 4.8 WPF) for PDF / DOCX / XLSX. Core features: fast open & continuous PDF reading, PDF pro edit (object-level text/image), large-sheet XLSX virtual grid with simple edit, DOCX structure view, Chrome-style tabs, single-instance, session restore, four UI languages (zh/en/ja/ko).

Language: 中文说明 (README.zh.md)

Features

Highlights that set DocviewWPF apart from a plain PDF-only reader or office-only apps:

• Three formats in one window — open PDF / DOCX / XLSX side by side in tabs (not PDF-only).
• PDF Pro Editor — dedicated window for page-object edit: select / marquee multi-select, drag with live ghost preview, text replace with embedded system fonts (CJK-safe), images, whiteout, shapes; undo/redo; vector-oriented save when pdfium allows.
• XLSX built for large sheets — virtualized OnRender grid, freeze panes, filters, column/row resize, wrap, and a simple Excel-like edit mode (merge, align, font, colors, arrow/Tab navigation, block select).
• DOCX reading that keeps structure — flow layout with outline (incl. SDT fields), numbering/bullets, margins — without launching Word.
• Chrome-style tabs — reorder with animation, tear off into a new window while dragging, drop back to merge.
• True single-instance — second launch activates the existing process and forwards open paths (no duplicate main windows).
• Session & reading progress — optional restore of last tabs; per-file scroll/zoom/page/sheet memory for PDF, DOCX, and XLSX.
• Find with on-screen highlight — Ctrl+F; all matches in view highlighted (current vs others), per-tab search text.
• UI in four languages — 中文 / English / 日本語 / 한국어 (Help → Language, or Settings).
• Lightweight chrome — custom title bar & icon toolbar, maximize within work area (no taskbar cover), F fullscreen.

Also: outline sidebar, shared-read open for locked files, recent files, themes and UI font size.

Requirements

• Windows x64
• .NET Framework 4.8
• Visual Studio / MSBuild (or dotnet SDK with net48 targeting pack)

Build & run

dotnet restore DocviewWPF\DocviewWPF.csproj
dotnet build DocviewWPF\DocviewWPF.csproj -c Release

Output: DocviewWPF\bin\Release\net48\DocviewWPF.exe
Solution: DocviewWPF.slnx

Configuration

%LocalAppData%\DocviewWPF\
  settings.json
  session.json
  reading_progress.json
  recent.json

Runtime logs (from build output): DocviewWPF\bin\Release\net48\logs\docviewwpf_YYYYMMDD.log

Keyboard shortcuts

Shortcut	Action
Ctrl+O	Open
Ctrl+W	Close tab
Ctrl+Tab / Ctrl+Shift+Tab	Next / previous tab
Ctrl++ / Ctrl+- / Ctrl+0	Zoom in / out / actual size
Ctrl+wheel	Zoom
F	Fullscreen
Esc	Exit fullscreen / clear selection
Ctrl+F	Find
Ctrl+C	Copy selection
Ctrl+S	Save (edit modes)

Project layout

DocviewWPF.slnx
DocviewWPF/
  DocviewWPF.csproj
  App.xaml(.cs) · MainWindow.xaml(.cs)
  Core/           # settings, session, theme, log, i18n, single-instance
  Viewers/        # PDF / DOCX / XLSX & PDF pro editor
  Assets/
README.md · README.zh.md · CHANGELOG.md

Dependencies (NuGet)

• PDFtoImage (pdfium + SkiaSharp)
• DocumentFormat.OpenXml
• System.Memory / System.Runtime.CompilerServices.Unsafe

Changelog

See CHANGELOG.md.