Self-hosted alternatives to Adobe Acrobat
Merging two PDFs should not require a subscription to a creative suite.
Below are 10 open-source projects that cover the same ground, each scored 0–100 on how actively it is actually maintained — commit volume, release cadence and recent trend. 8 of the 10 are currently rated healthy or better. Ordering reflects that score, not sponsorship.
| Project | Health | Activity (11 mo) | Stars | Licence | Last release |
|---|---|---|---|---|---|
| Stirling-PDF Local hosted web application that allows you to perform various operations on PDF files, such as merging, spli | Thriving · 95 | 93k | Apache-2.0 | 26 Sept 2026 | |
| Paperless-ngx Scan, index, and archive all of your paper documents with an improved interface (fork of Paperless). | Thriving · 90 | 46k | GPL-3.0 | 20 Sept 2026 | |
| Docuseal Create, fill, and sign digital documents (alternative to DocuSign). | Thriving · 85 | 19k | AGPL-3.0 | 21 Sept 2026 | |
| Papra Minimalist document storage, management and archiving platform designed to be simple to use and accessible to | Thriving · 83 | 5.5k | AGPL-3.0 | 1 Sept 2026 | |
| Documenso Digital document signing platform (alternative to DocuSign). | Healthy · 78 | 15k | AGPL-3.0 | 9 Sept 2026 | |
| Gotenberg Developer-friendly API to interact with powerful tools like Chromium and LibreOffice for converting numerous d | Healthy · 76 | 13k | MIT | 11 Sept 2026 | |
| SnapOtter Suite of 200+ web tools for converting and editing images, videos, audio and PDFs, including a layer-based ima | Healthy · 71 | 2.8k | AGPL-3.0 | 29 Jul 2026 | |
| BentoPDF Powerful, privacy-first, client-side PDF toolkit that allows you to manipulate, edit, merge, and process PDF f | Healthy · 70 | 16k | AGPL-3.0 | 29 Aug 2026 | |
| OpenSign Document signing software (alternative to DocuSign). | Steady · 65 | 7k | AGPL-3.0 | 21 Aug 2026 | |
| Docspell Auto-tagging document organizer and archive. | Steady · 62 | 2.3k | GPL-3.0 | 22 Sept 2026 |
How these were picked
Every project listed here is open source and can run entirely on hardware you control. We start from the categories that match Adobe Acrobat's job — Document Management — then rank by health score so that a popular-but-abandoned project never appears above a smaller one that is actively shipping. The scoring method is documented in full.
The scores are recomputed from repository data on every rebuild, so this page reflects the state of these projects as of 1 Oct 2026 — not the day it was written.
Stirling-PDF
Local hosted web application that allows you to perform various operations on PDF files, such as merging, splitting, file conversions and OCR.
Best fit: It is well-suited for users who need a centralised tool for document manipulation without relying on external cloud-based services.
Worth knowing: The resource footprint of a Java-based web application can be heavier than native alternatives, requiring adequate memory allocation on your server.
Paperless-ngx
Scan, index, and archive all of your paper documents with an improved interface (fork of Paperless).
Best fit: It is well-suited for home users or small offices wanting to reduce physical clutter by moving invoices, receipts, and letters into a searchable digital archive.
Worth knowing: OCR processing and text extraction can be resource-intensive during initial ingestion, potentially straining lower-powered home server hardware.
Docuseal
Create, fill, and sign digital documents (alternative to DocuSign).
Best fit: This is a suitable choice for teams or individuals looking to replace third-party e-signature SaaS tools with an in-house solution operating under an AGPL-3.0 licence.
Worth knowing: You will need to review the AGPL-3.0 licence requirements carefully if you plan to modify and distribute the software or offer it as a service to external users.
Papra
Minimalist document storage, management and archiving platform designed to be simple to use and accessible to everyone.
Best fit: It is a suitable option if you want a straightforward, lightweight digital filing system without the complexity of enterprise content management software.
Worth knowing: Because the platform focuses heavily on minimalism, it may lack advanced document processing features, collaborative editing, or granular access controls found in more established alternatives.
Documenso
Digital document signing platform (alternative to DocuSign).
Best fit: This is a good fit if you need to retain strict control over signing logs and sensitive documents to comply with internal privacy policies or external data regulations.
Worth knowing: The project is licensed under the AGPL-3.0, which places strict copyleft requirements on your network if you modify and distribute the software. It also competes in a heavily entrenched market, meaning external third-party integrations may require more manual configuration than commercial equivalents.