KillerPDF is a free, open-source PDF editor for Windows designed to provide comprehensive PDF editing and management without requiring user accounts or sending data externally. It is distributed as a lightweight native executable, approximately 14 MB in size, which can be installed or run portably on Windows 10 and 11 x64 systems. NET, utilizing PDFium for rendering and Tesseract for optical character recognition (OCR), with additional language models downloaded only as needed to keep the base download small.
The feature set includes viewing and navigating PDFs with four view modes—single page, continuous scroll, two-page, and a grid of all pages. Users can open multiple PDFs in tabs, search documents, access outlines, and follow clickable links. Editing capabilities cover inline text editing with font matching, text boxes, freehand drawing, line tools, and highlights, each customizable by color, opacity, and width, with a full RGB color picker available. The platform supports OCR for scanned documents or selected regions, making PDFs searchable or extracting text to a file. Page organization features include merging and splitting PDFs, reordering, rotating, extracting pages, and stamping page numbers. Users can also drop folders or ZIP files to merge their contents or open each file separately.
KillerPDF offers tools for filling and signing PDF forms, including reusable signature drawing and support for signing with a cloud certificate via Certum SimplySign. Transformation tools allow users to rotate, scale, flip, and straighten pages with live previews, while annotations remain attached. Printing options are extensive, with in-app print previews and controls for scale, position, margins, pages-per-sheet, color, and duplex printing, as well as the ability to save flattened, uneditable copies. The application supports six UI themes, nine languages, and a resizable sidebar. Users can view and edit PDF metadata and apply text watermarks or page number stamps across selected page ranges. It can open password-protected PDFs and repair damaged files for viewing and printing.
KillerPDF is released under the GPLv3 license and does not include ads, telemetry, or subscription requirements. net suite. It is aimed at users seeking a privacy-focused, fully featured PDF editor that operates entirely offline.
KillerPDF is a Design & Creative product. Editing, annotating, and managing PDF documents locally without subscriptions or cloud uploads. It is built as an open-source project for windows users, students, professionals, open-source enthusiasts. KillerPDF is open source under the GPL-3.0 license. It runs on the web, the command line, and Windows, and it can be self-hosted.
Open Source Maintainers builds and maintains KillerPDF, and the product first shipped in 2026. Development happens publicly on GitHub with 2.8k stars and 97 commits in the last 90 days. Key capabilities include PDF editing, OCR, and form filling.
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