Stirling-PDF
Stirling PDF Inc.
Stirling-PDF brings dozens of tools into one interface: merge, split, reorder pages, compress, OCR, redact, compare, sign, convert and no-code automation of action chains, plus a REST API for nearly every tool. You can install it as a desktop program or run it on an office server (for example with Docker) and use it from the browser, so files never leave the internal network. It suits an office that wants a shared PDF tool without uploading project documents to outside websites. Limitation: a server install needs some technical skill, and on the vendor’s hosted cloud files are processed on its servers.
Ratings & Reviews
| Licence type | Completely Free, Open Source |
|---|---|
| Licence terms | Open-core model: the core is MIT-licensed and free on desktop and self-hosted, including commercially; some repository folders (enterprise and cloud components) are under a separate proprietary licence. The vendor’s cloud has a free plan with 1,000 credits per month; paid Team and Enterprise plans add SSO and user management. |
| Platforms | Linux, macOS, Windows, Runs in the Browser |
| Engineering field | Architecture, Civil Engineering, Electrical & Electronics, Mechanical Engineering |
| Tool type | Documents & PDF |
| Vendor site | www.stirling.com |
This link goes to the vendor site. EngiFree hosts no installers and distributes no cracked versions.
Last verified: 2026-10-16
