Stirling PDF edits, signs, and converts documents on your own machine instead of uploading them to a website
The free tier is a real desktop app, not a row of upload boxes on somebody else's server.
Stirling PDF's own pricing page lists a free Editor tier with 60 or more PDF tools, reachable as a desktop app, in a browser, or self-hosted, with no per-seat charge for individual use. The project describes itself as a way to edit, sign, redact, convert, and automate PDFs without sending documents to external services, and its GitHub repository, which shows about 90,000 stars, gives a one-line Docker command for anyone who wants to run it on a home server instead. Writing on August 22, XDA's Parth Shah said he moved his merging, splitting, compressing, watermarking, redacting, and OCR work to it and now has complete peace of mind about where his files go. The open-core boundary is worth knowing before a whole team leans on it: shared workspaces and single sign-on sit in a Server plan at $99 a month, and API and pipeline access is metered at a cent per credit, with the first 500 runs free.
