8 Best Open-Source Desktop PDF Editors Without Watermarks

Many free PDF editors trap you behind paywalls, stamp exported pages with branding, or force you to upload sensitive files to cloud servers. The open-source options below run locally on your desktop, publish their source code publicly, and export fully functional PDFs with zero watermarks, usage caps, or mandatory accounts. We tested each app on Windows 11, macOS, and Linux where supported, checking layout preservation, export quality, bloat, and whether saved outputs carry hidden branding.

Disclaimer: Always download from the official project repositories. Third-party mirrors sometimes repackage open-source software with adware. Complex scanned PDFs may require an extra OCR workflow.

1. LibreOffice Draw

Best for: General text and object editing LibreOffice Draw is the most well-rounded open-source pick for casual PDF edits. It imports PDFs and converts content into editable vector objects, so you can tweak existing text, swap images, add signatures, insert new text boxes, or delete unwanted elements before exporting back to PDF.

  • Platforms: Windows, macOS, Linux
  • Pros: Cross-platform, part of a trusted office suite, digital signature support, fully offline
  • Cons: Layouts can shift slightly on heavily formatted multi-column documents; not built natively for PDF workflows
  • Best for: Quick fixes, correcting typos, editing flyers, forms, and simple reports

2. PDFsam Basic

Best for: PDF page manipulation (split, merge, rotate) PDFsam Basic is a lightweight, focused utility for page-level PDF operations. It excels at merging batches of PDFs, splitting large files by page range, rotating pages, extracting selected pages, and creating booklet layouts. It does not edit text, but it is rock-solid for document assembly.

  • Platforms: Windows, macOS, Linux
  • Pros: Extremely stable with huge files, simple UI, tiny footprint
  • Cons: No inline text editing, no annotation tools
  • Best for: Invoices, scanned documents, bulk sorting, and reorganizing PDF pages

3. Xournal++

Best for handwriting, stylus markup and annotations Xournal++ is built for pen input. It opens PDFs as a background layer and lets you draw highlights, handwritten notes, mathematical formulas, and freehand annotations. Annotations save as layers on the PDF, and exports retain all markup without flattening unless you choose to.

  • Platforms: Windows, macOS, Linux
  • Pros: Excellent pressure sensitivity, smooth ink, great for tablets and 2-in-1 laptops
  • Cons: Cannot edit the original underlying PDF text; poor for scanned image-only PDFs
  • Best for: Students, teachers, grading papers, taking notes on lecture slides

4. Inkscape

Best for vector-heavy PDF graphics editing Inkscape imports PDF vector content as editable paths. If your PDF is a diagram, illustration, poster, or technical drawing, you can modify shapes, colors, lines, and text at the vector level without losing quality. Each page loads separately for editing.

  • Platforms: Windows, macOS, Linux
  • Pros: Industry-grade vector tools, scalable artwork, high-fidelity graphic edits
  • Cons: Cumbersome for multi-page text documents; steep learning curve
  • Best for: Designers, technical schematics, posters, logos inside PDF files

5. Stirling PDF

Best for self-hostable, all-in-one local PDF toolkit Stirling PDF is a modern open-source PDF suite that you run locally on your desktop or host on your server. It bundles compression, OCR, redaction, password encryption, page cropping, batch conversion, and metadata editing. All processing happens locally, no external uploads.

  • Platforms: Windows, macOS, Linux (Docker / desktop build)
  • Pros: Feature-packed, clean web UI, great for privacy-focused batch jobs
  • Cons: Slightly more setup work than standalone desktop apps
  • Best for: Legal, finance teams, anyone processing confidential documents in bulk

6. Okular

Best for annotation, form filling and reading on Linux / KDE Okular is the default PDF viewer for KDE, but it includes solid editing tools: sticky notes, freehand drawing, highlight tools, form filling, signature insertion, and page cropping. It supports PDF annotations and exports modified files cleanly.

  • Platforms: Linux, Windows, macOS
  • Pros: Lightweight, fast rendering, advanced annotation controls
  • Cons: Windows/macOS builds get less frequent updates than the Linux version
  • Best for: Linux users, long PDF reading sessions, reviewing research papers

7. PDFArranger

Best for quick page reordering and cropping PDFArranger is a minimal fork of PDF-Shuffler. It gives you a thumbnail view of all pages, so you can drag and drop to reorder, crop, delete, rotate, or duplicate pages. It is simple, fast, and perfect for quick cleanup after scanning stacks of paper.

  • Platforms: Windows, Linux, macOS
  • Pros: Super intuitive, fast thumbnail preview, low RAM usage
  • Cons: No text editing or markup functions
  • Best for: Scanner output, fixing page order, trimming scanned margins

8. OCRmyPDF (CLI + GUI wrappers)

Best for adding searchable text layers to scanned PDFs OCRmyPDF is a command-line open-source tool that runs OCR on image-only scanned PDFs. It embeds a hidden searchable text layer over the scanned page. Pair it with a GUI frontend for easier use. The final exported PDF is searchable and fully watermark-free.

  • Platforms: Windows, macOS, Linux
  • Pros: Accurate Tesseract OCR engine, supports batch processing
  • Cons: No visual editing interface by default; requires basic comfort with command line
  • Best for: Old books, scanned contracts, archives, image-only PDFs

How We Separated Real Open-Source Tools From Fakes

True open-source editors publish their source code on GitHub/GitLab under a recognized license (GPL, MIT, MPL). We excluded freemium tools that claim to be “free” but lock export behind a paywall. All eight tools above meet this standard.

Quick Pick Guide

✅ If you need to edit text: LibreOffice Draw ✅ If you only need to rearrange pages: PDFsam Basic / PDFArranger ✅ If you draw and annotate with a stylus: Xournal++ ✅ If you work with vector graphics: Inkscape ✅ If you need batch OCR for scans: OCRmyPDF ✅ If you want a full local privacy toolkit: Stirling PDF

Important Limitation

Nearly all open-source PDF editors struggle with one thing: scanned image-only PDFs. Unless you use OCRmyPDF, you cannot edit the text inside scanned pages — you can only draw annotations on top. For native text PDFs, these tools work extremely well.

Final Verdict

These open-source editors prove you do not need Adobe Acrobat for most PDF workflows. They avoid the two biggest pain points of mainstream free PDF software: forced cloud uploads and watermarked exports. They are especially valuable if you work with sensitive contracts, tax forms, or private documents you never want to send to third-party web services.