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Stirling PDF vs PDF24 Tools: catalog facts
Stirling PDF	PDF24 Tools
Freemium Free plan is $0/month with no card required (60+ tools, web/desktop/self-hosted, 500…	Free Free to use and supported by advertising.
Windows, macOS, Linux, Web, Self-hosted	Web, Browser extension
55+ PDF tools covering signing, converting, merging, editing, OCR and redaction, chained in a stateful workspace with… Runs on Docker, bare metal, Kubernetes or as native desktop apps for Windows, macOS and Linux	No registration, limits or watermarks Wide range of PDF tools
Open-core: SSO, external database, Google Drive integration, SAML and audit logs are gated behind paid Team or… Manual server setup needs Java 25+ plus LibreOffice and Tesseract for conversions and OCR	Files are uploaded to PDF24's servers for processing Shows advertising
Self-hosted, Downloadable app, Web application, Hosted service	Web application, Browser extension
Open source	Closed source
License: MIT	License not stated
No account needed	No account needed
Works offline	Needs internet
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.