Open source Acrobat alternatives, compared

PdfCraft is ArtCraft’s open-source PDF workbench, distributed under MIT OR Apache-2.0. The official project describes viewing and searching, reordering, combining, extracting and splitting pages, plus comments, forms and password-protected documents. Its repository lists macOS, Windows, Linux and web targets, although the available package for a given platform should be checked release by release.

The appeal is a single application for the everyday assembly jobs that send people back to Acrobat: rotate a scan, delete a blank page, merge a signed cover sheet, add a comment, protect a file. It is also early alpha. The project’s own gap notes describe incomplete Office conversion, complex text editing, non-Latin OCR, preflight and advanced signatures. Those are not edge cases in office and legal work.

Choose PdfCraft for page organization and simple review when you can keep the original and verify the output. Do not treat it as a replacement for Acrobat’s text reflow, accessibility repair, redaction assurance or certificate workflows until you have tested the exact operation on a copy. The PdfCraft app guide tracks its release status and documented gaps.

PDF Arranger is a GPL-3.0-or-later desktop application for rearranging PDF pages. It presents thumbnails and lets you reorder, duplicate, delete, rotate, crop, split and merge documents, then export a new PDF. It is available for Windows and Linux, with community packages for other systems, and it uses Poppler for PDF rendering and manipulation.

Its strength is honesty about scope. PDF Arranger does not edit the text inside a page, create forms, apply signatures or repair a broken content stream. It is the tool to reach for when the content is correct and the sequence is wrong: a scanned contract with pages out of order, a report with a duplicated cover, or a set of invoices that needs to become one file. The interface is plain and the learning curve is short.

The boundary appears with mixed page sizes, crop boxes, embedded fonts and documents that already contain annotations or form fields. Test those on a copy, because page-level operations can preserve or discard structures in ways that are not obvious from a thumbnail. Pair PDF Arranger with a reader such as Okular and, when the text itself must change, a different editor.

LibreOffice Draw is the MPL-2.0 drawing component of LibreOffice. It can open a PDF as an editable Draw document, exposing text frames, vector objects and images. Small corrections — a wrong date, a moved logo, a deleted line — are possible, and the result can be exported back to PDF. It runs on Windows, macOS and Linux and is already installed in many organisations.

The catch is reflow. A PDF is a page description, not a word-processing document. Draw reconstructs objects as best it can, so paragraphs may split into separate text boxes, fonts may substitute, and complex layouts may shift. It is not a form designer, a signing platform or a preflight tool, and it will not preserve every tagged-PDF or accessibility structure.

Choose Draw for quick, low-risk fixes to simple documents where you can compare the exported page against the original. Do not use it to edit a 200-page report, a press-ready brochure or a document whose reading order and tags must remain intact. For those jobs, return to the source file or use a dedicated PDF editor.

Okular is a GPL-2.0-or-later document viewer from the KDE community, available on Windows, macOS and Linux. For PDFs it supports navigation, search, bookmarks, annotations, form filling and digital signatures, along with review tools such as highlights and notes. It is a reader first, not a page assembler or a content editor.

That makes it the best free choice for the part of Acrobat that most people actually use: reading a long document, filling an interactive form, adding a comment and checking a signature. Its annotation layer can be exported and reviewed, and the interface stays responsive on large files where browser viewers struggle. It also opens many other document formats, which helps when a workflow mixes PDF, EPUB and office files.

The boundary is structural change. Okular does not merge, split, rotate or delete pages as a document operation, and it does not edit body text. Signature support depends on certificate setup and the PDF’s security model, and the result should be validated in the recipient’s software. Use Okular for reading and review, PDF Arranger for page order, and a full editor only when the content itself must change.

Stirling PDF is an MIT-licensed, self-hosted web application that bundles many PDF operations behind a browser interface. Depending on the version and enabled modules, it can merge, split, compress, convert, rotate, watermark, OCR, redact and fill forms. Because it runs on your own server, documents do not need to be uploaded to a third-party service.

It suits teams that want a shared internal toolbox rather than a desktop application. A small Docker deployment can replace a folder of ad-hoc scripts and give non-technical colleagues a consistent page for common jobs. Administrators can control which tools are exposed and how files are retained, which matters when documents contain client or personnel data.

The limits are operational and editorial. Someone must run, update and secure the server; large files and OCR jobs consume memory and CPU; and the available tools vary by release. It is not a WYSIWYG editor for complex layouts, and its redaction or signature features should not be trusted with legal material without verification. Treat it as a batch utility, not as Acrobat’s equivalent for text editing or preflight.

PDF24 Creator is a free, proprietary Windows application that collects many PDF utilities in one installer: merge, split, compress, convert, OCR, compare, protect and a virtual printer. It is free to download and use under the vendor’s terms, but it is not open source, and the code cannot be audited, forked or redistributed.

Its practical advantage is breadth on Windows. A user who needs to combine scans, add a watermark, compress a file for email and print to PDF can do all of it without assembling several programs. The interface is functional rather than elegant, and the vendor also offers online tools with their own privacy terms.

The boundary is control. The desktop suite is Windows-only, the licence is proprietary, and advanced editing, accessibility repair, preflight and certificate-based signing are not its strength. Online tools raise separate questions about where documents are processed. Use PDF24 when a Windows user needs a broad free utility set and has checked the current terms; do not describe it as an open source Acrobat alternative.