Should you self-host Stirling PDF or just open a tab?
Stirling PDF is a full suite you run on your own machine or network, so documents never reach a vendor. PDFGym is a smaller set of file tools that run inside the browser with nothing to install. Run Stirling PDF when you have infrastructure and someone to look after it, and use the tab when you just need a file fixed now.
Who each setup suits
Picture an office manager at a ten-person studio. Client contracts land daily, the partners insist nothing confidential may sit on outside servers, and the studio already pays for a small server that hosts its intranet. For her, Stirling PDF is close to ideal: one install serves the whole team, the files stay on hardware she can point at, and the suite covers far more jobs than any tab tool will.
Now picture a freelance illustrator on a borrowed laptop in a coworking space. She needs to shrink portfolio.pdf to under 5 MB before a submission form closes in an hour. She has no server, no admin rights and no interest in learning container installs today. For her, opening the compressor, typing the target and downloading the result is the whole answer. Ask which of these two people you are this week, and the choice makes itself.
Stirling PDF and PDFGym compared
On its site the project calls itself a free and private PDF editor, and it names three places to run it: Stirling Cloud, servers of your own, or fully air-gapped hardware. The same page promises a catalogue beyond sixty tools, carries a files-never-leave line, claims total downloads past thirty million, and prices individual use as free. Checked 10 September 2026. Against that, here is the honest side by side.
| Stirling PDF | PDFGym | |
|---|---|---|
| Where it runs | Stirling PDF A server you operate Your hardware, your network, your rules. | PDFGym Your browser tab No server exists anywhere in the path. |
| Getting started | Stirling PDF An install project Container runtime, access setup, updates to schedule. | PDFGym Open a page Nothing to install, patch or monitor. |
| Breadth of tools | Stirling PDF More than sixty Recognition, conversion and editing included. | PDFGym File handling, light extras Size, pages, images, passwords, stamps, redaction, plus text-first converters. |
| Who keeps it alive | Stirling PDF You or your team Patching, backups and uptime are yours. | PDFGym Nobody on your side Close the tab and there is nothing left running. |
| Ongoing cost | Stirling PDF Hosting and time The software is free; the machine and upkeep are not. | PDFGym Nothing to run |
| Team features | Stirling PDF A paid team tier For shared logins and managed use. | PDFGym None One person, one tab, no accounts at all. |
Where Stirling PDF wins
Capability, by a wide margin. A server can run text recognition on a scanned bundle, convert between office formats with layout kept and keep a whole team on one shared install. Those are exactly the jobs PDFGym does not attempt, and if your week includes them regularly, the install effort pays for itself fast.
The air-gapped option deserves its own sentence. Cut off from the network entirely, with documents processed on isolated hardware, it is the strongest privacy arrangement this category offers. Hosted Stirling Cloud removes the maintenance work instead, at the cost of putting files on vendor hardware again, which returns you to the trade you were trying to escape.
Where the tab wins
Everything about friction. No machine to provision, no container runtime to feed, no reverse proxy to configure so colleagues can reach it, no Sunday evening patching, and nobody to call when it stops responding during a holiday. Each tool opens, does its job and closes.
The ceiling is real and stated openly: a focused toolset, no text recognition, text-first conversion only, light text edits only, and speed bounded by your own device. Splitting and reordering pages shows the shape of the trade: less power, but the output is checked against the input in front of you, and very large files can be split into parts first. Read the browser against server page for which jobs genuinely need the server side.
How we checked
We reused the project's own published claims quoted above, checked 10 September 2026, and matched them against the PDFGym tool pages and code in this repository. We did not install Stirling PDF, create accounts or run timed tests, so this page compares the two setups from their documented shape, not from benchmark results.
Short answers about Stirling PDF and PDFGym
- Is Stirling PDF free?
- The project prices individual use as free, checked 10 September 2026. The software costs nothing, but the machine it runs on and the time to maintain it are real costs you carry.
- Do I need a server to use Stirling PDF?
- For the self-hosted setup, yes: a machine, a container runtime and someone who keeps it updated. Stirling Cloud removes that work and puts the files on vendor hardware instead.
- Can I run Stirling PDF with no internet at all?
- Its site lists air-gapped operation among the install shapes, checked 10 September 2026. That is the strictest privacy setup available here, and only teams that can run isolated hardware get it.
- What can PDFGym do instead?
- File handling in a tab: size targets, page order, rotation, images both ways, passwords, stamps, redaction and metadata checks, plus text-first converters and light edits. No install and no upkeep, but no text recognition, no formatted conversion and no in-place editing either. How it works draws the line precisely.
Related tools and setup guides
- Every online PDF tool Browse the tab tools grouped by job, each free and local to your browser.
- How it works Learn what runs inside the tab and what the site never receives.
- PDFGym vs PDFsam Weigh a desktop app that needs no server against the tab.
- Browser vs server PDF tools See the general case for tab tools against server tools.