Stirling-PDF — The #1 Open-Source PDF Application on GitHub. Here are the closest alternatives and when to pick each.
AI verdict· generated Jul 15, 2026How we pick
If you’re considering alternatives to Stirling-PDF, it’s important to evaluate your specific needs as some tools serve distinct purposes. Below is a brief comparison to help you decide based on your use case.
If you want a tool for personal organization or knowledge management, consider Obsidian. It's free and enables you to create a private knowledge base, but it lacks PDF-specific features. Stirling-PDF excels in document processing, so if you need secure PDF editing, stick with it.
For developers looking to interact with documents using GPT, private-gpt is a great choice. It's open-source and prioritizes privacy, making it suitable for experimenting with AI on documents. However, it does not offer traditional PDF editing functionalities, which Stirling-PDF provides.
If you’re part of a design team needing a collaborative tool, Penpot is your best bet. It’s tailored for design and prototyping rather than PDF processing. Therefore, if you need to work with PDF documents, your best option remains Stirling-PDF.
For teams focused on project management, Linear offers a sleek experience for issue tracking. While it’s not directly comparable to Stirling-PDF, it complements project workflows where document handling is secondary. For primary PDF tasks, you may need to stick with Stirling-PDF.
In cases where secure PDF processing and editing are paramount, Stirling-PDF remains the strongest option.