KillerPDF: Free Open Source PDF editing on Windows

KillerPDF is a lightweight, portable PDF editor for Windows built for users who want full control without subscriptions, installers, or telemetry. It runs as a single executable, making it ideal for USB use and field work. You can view PDFs with smooth PDFium rendering, navigate quickly with thumbnails, zoom, and shortcuts, and reorganize pages using drag-and-drop. It supports merging multiple PDFs, splitting documents, and extracting selected pages.

KillerPDF also allows inline text editing with font matching to preserve the original layout, plus annotations like text boxes, freehand drawing, highlights, and reusable signatures. You can search full text, copy content easily, and print documents with flattened annotations.

Designed as a free and open alternative to bloated PDF tools, it works fully offline on Windows 10/11 x64. No runtimes install. Everything needed is inside the EXE (targets .NET Framework 4.8, which ships with every supported Windows release).

KillerPDF key features:

• High-quality PDF rendering via PDFium
• Edit PDF text inline (double-click to modify text)
• Page thumbnails and fast navigation with zoom and shortcuts
• Merge multiple PDFs into one
• Split PDFs and extract selected pages
• Drag-and-drop page reordering
• Font matching to preserve original document appearance
• Text boxes for notes
• Freehand drawing tools
• Highlight overlays with adjustable color, size, opacity
• Undo actions and clear per-page annotations
• Create, draw, and save reusable signatures
• Click-to-place signatures anywhere
• Full-text search with highlighted results
• Drag-select or Ctrl+A to copy text
• Print with annotations flattened
• Portable single-file app (~10 MB)
• No installer, no admin rights required
• No account, no telemetry

KillerPDF 1.1.1 changelog:

• Fixed maximize covering the taskbar (WM_GETMINMAXINFO hook, multi-monitor aware).
• Fixed two CS8602 nullability warnings.

Download: KillerPDF 1.1.1 | 5.8 MB (Open Source)
Link: KillerPDF Home Page | Github | Screenshot

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