Free alternatives to diff-pdf

Freemium = a free plan with paid upgrades; check the limits of the free plan.

1. PB

   PDFsam Basic

   Sober Lemur S.r.l.s. (PDFsam)

   87

   Merge and split PDF files for free

   Open source 85 WindowsLinuxmacOS
2. SU

   SumatraPDF

   Krzysztof Kowalczyk (SumatraPDF)

   87

   A tiny, very fast PDF reader

   Open source 63 Windows
3. AG

   Agentero

   poco-ai

   67

   Agent 友好的文献管理方式。

   Open source 77 Windows
4. BD

   Batch Docs Free Edition

   BinaryMark

   67

   Replace text in, add or remove content, and edit thousands of Word documents in doc and docx formats, PDFs, RTF documents, and other text documents.

   Free + paid plans 77 Windows
5. BW

   Batch Word Replace Free Edition

   BinaryMark

   67

   Replace, insert new content, remove existing text, change text style and formatting in 1000s of Word and text documents in bulk. Save results and convert between various document formats: docx, doc, pdf, odt, rtf, wpd, txt, xps, html, and others.

   Free + paid plans 77 Windows
6. CI

   CK Image & PDF Reducer

   epatels

   67

   A free, offline, drag-and-drop tool for shrinking images and PDFs — no uploads, no subscriptions.

   Free 77 Windows
7. CW

   CutePDF Writer

   Acro Software Inc.

   67

   Create PDFs from almost any application

   Free 77 Windows
8. DA

   Dangerzone

   Freedom of the Press Foundation

   67

   Take potentially dangerous PDFs, office documents, or images and convert them to safe PDFs

   Open source 77 Windows
9. DO

   Doro

   the sz development

   67

   Free PDF Printer

   Free 77 Windows
10. EX

    Excel2ZUGFeRD

    Lka

    67

    Erzeugt ZUGFeRD kompatible PDF aus Excel Daten.

    Open source 77 Windows
11. FL

    flip

    H.K

    67

    Capture a region of your screen, page by page, into images or a PDF.

    Free 77 Windows
12. HC

    HP Click

    HP

    67

    Print the most common formats like PDF, JPEG, TIFF, and HP-GL/2 files with one click.

    Free 77 Windows
13. IE

    Ipe extensible drawing editor

    Otfried Cheong

    67

    A drawing editor for creating figures in PDF format

    Open source 77 Windows
14. KI

    KillerPDF

    Steve the Killer

    67

    PDF editor for Windows. No account, no subscription, no telemetry.

    Open source 77 Windows
15. KC

    Kindle Comic Converter

    ciromattia

    67

    Kindle Comic Converter is a Python app to convert comic/manga files or folders to EPUB, Panel View MOBI or E-Ink optimized CBZ.

    Open source 77 Windows
16. KR

    Koodo Reader

    App by Troye

    67

    All-in-one ebook reader

    Open source 77 Windows
17. LI

    LibreCAD

    LibreCAD Team

    67

    LibreCAD is a cross-platform 2D CAD program written in C++11 using the Qt framework. It can read DXF and DWG files and can write DXF, PDF and SVG files. The user interface is highly customizable, and has dozens of translations.

    Open source 77 WindowsLinux
18. NA

    NAPS2

    NAPS2 Software

    67

    Scan documents to PDF and other file types, as simply as possible.

    Open source 77 WindowsmacOS
19. NB

    No Bloat PDF

    Brian Galvan

    67

    A tiny, fast, private PDF viewer. No ads, no accounts, no telemetry.

    Free 77 Windows
20. PA

    PaperQuay

    paperquay

    67

    A desktop-first literature manager for PDF reading, translation, paper overviews, and AI agent workflows.

    Open source 77 Windows
21. PA

    papio

    OrgMentem

    67

    Acquire and validate scholarly PDFs for your reference library

    Open source 77 Windows
22. PX

    PDF-XChange Editor

    PDF-XChange Co Ltd.

    67

    The smallest, fastest and most feature-rich free PDF viewer/editor on the market.

    Free + paid plans 77 Windows
23. PX

    PDF-XChange Printer Lite

    PDF-XChange Co Ltd.

    67

    A simplified version of PDF-XChange Printer Standard virtual PDF printer.

    Free 77 Windows
24. PC

    PDF24 Creator

    geek software GmbH

    67

    A free and easy to use PDF solution with many features

    Free 77 Windows
25. PD

    PDFApps

    Nelson Duarte

    67

    Fast, offline, subscription-free PDF editor

    Open source 77 Windows
26. PD

    pdfcpu

    pdfcpu

    67

    A PDF processor written in Go.

    Open source 77 Windows
27. PD

    PDFGeek

    TechyGeeksHome

    67

    Merge, split, extract, rotate, watermark and password-protect PDFs on your own machine.

    Open source 77 Windows
28. PR

    PrintBridge

    Vergil

    67

    A local print bridge for web applications.

    Open source 77 Windows
29. QP

    QPDF

    QPDF

    67

    QPDF is a command-line tool and C++ library that performs content-preserving transformations on PDF files.

    Open source 77 Windows
30. RA

    RAG Assistant for Zotero

    Alexander Hepburn

    67

    RAG tooling, reimagined with researchers in mind: literature discovery and review via semantic search of your Zotero PDF collection

    Open source 77 Windows