PDF tools that don't upload your files

What normally happens to your file

When you drop a PDF onto a typical online tool, the file is transferred to that company's servers, processed there, and held for a period before deletion — commonly a few hours. The established services are transparent about this and take it seriously: transfers are encrypted, retention windows are short, and deletion is automated.

For most documents that is a perfectly sensible trade. You get powerful processing for free and the file is gone by teatime.

But it is still a trade, and for some documents it is the wrong one. An employment contract, a payslip, a medical letter, a passport scan, a client file under NDA, anything covered by a confidentiality clause — for these, "we delete it afterwards" is a promise you cannot verify, made by a company you have no relationship with.

How to tell whether a tool uploads your file

You do not have to take anyone's word for it, including ours. There is a test that takes ten seconds and cannot be faked:

Load the page, turn off your wifi, then use the tool.If it still works, your file is not going anywhere — because it physically cannot. If it fails or hangs, the work was happening on somebody else's computer.

Try it here. Open the merge tool, switch on flight mode, and combine two files. It will work. That is not a claim about our intentions; it is a fact about where the processing happens.

Where upload-based tools are genuinely better

Being straight about this, because it matters if you are choosing:

• OCR and text recognition. Turning a scanned image into searchable text needs serious processing, and server-based tools do it far better than anything running in a browser tab.
• Heavy compression. Squeezing a large PDF down while keeping it readable benefits from the same horsepower.
• Very large files. A server has more memory than your phone. If you are working with a 500-page scanned document, an upload service will cope where a browser may not.
• Conversion between formats. PDF to Word, Excel and similar are hard problems that are still better solved server-side.

If you need those, use a service that does them well. The point is not that uploading is wrong — it is that for merging, splitting, rotating and reordering, uploading is unnecessary, and unnecessary risk is worth removing.

What runs entirely on your device

All free, no sign-up, no account, no watermark and no file limit beyond your own device's memory. They also work offline — you canadd them to your home screen and use them with no connection at all.

Common questions