Capabilities, limits, pricing, and processing policies can change. Verify the current provider page and privacy policy before choosing a workflow for sensitive or high-volume documents.
Three ways a PDF tool can avoid uploading your file
| Option | Where the file is processed | Setup | Good fit |
|---|---|---|---|
| FreePDFKit | In your browser tab. Core operations make no upload. | None. Open the page; no account. | One-off jobs on any device, including computers where you cannot install software. |
| PDF24 Creator | On your computer (desktop application). | Install the app on Windows. | Regular desktop use with a broad set of tools. |
| PDFsam Basic | On your computer (open-source desktop application). | Install; runs on Windows, macOS and Linux. | Splitting, merging, rotating and extracting pages in repeatable workflows. |
| Stirling-PDF (self-hosted) | On a server you run yourself, typically with Docker. | Technical: deploy and maintain it. | Teams that want a full PDF toolkit on infrastructure they control. |
PDF24 also offers online tools in addition to its desktop app. As with any web service, read what its policy says about uploads for the specific tool you plan to use. Limits, accounts, watermarks and supported formats vary by product and version, so check each project’s current page before relying on it.
Where FreePDFKit is the weaker choice
- Large files. Work happens in browser memory. A single file is capped at 256 MB (128 MB on low-memory devices), and Office conversions at 25 MB.
- Heavy, repeated batch work. A desktop app or a server you control is built for that; a browser tab is not.
- Collaboration and cloud storage. Browser-local tools do not provide shared workspaces.
How to choose
- Can’t install software, or it is a one-off job: use a browser tool such as Merge PDF, Split PDF or Compress PDF.
- You work with PDFs every day on one computer: a desktop app is a good fit.
- You need to serve a team and keep data on your own infrastructure: self-host.
Check a no-upload claim yourself
- Open the tool page and wait for it to load.
- Open your browser’s developer tools and switch to the Network tab.
- Run the tool on a non-sensitive test PDF.
- Look for any request that carries the file. A local tool shows no such request.
For the longer version, read browser processing versus cloud upload or run the on-device benchmark.
People also ask
Common questions
Do browser-based PDF tools upload my file?
It depends on the tool. Many browser-based tools send the file to a server and return the result. FreePDFKit’s supported core tools process the file inside your browser tab; you can confirm this by watching the Network tab in your browser’s developer tools while you run a tool.
Is a desktop app more private than a browser tool?
Both can keep the file on your computer. A desktop app needs an installation and updates; a browser tool needs nothing installed but depends on the browser and your device’s memory. Either way, confirm what the specific tool does with the file.
Is Stirling-PDF private?
Stirling-PDF is open source and designed to be self-hosted, so the file goes to a server that you run rather than to a third party. That is only as private as the machine and network you host it on, and it takes technical setup to run and maintain.
What should I use for a one-off confidential PDF?
If you cannot install software, a browser tool that processes locally is the quickest option. If you handle confidential PDFs regularly, a desktop app or a self-hosted server gives you a setup you control. Test with a non-sensitive file first.