It is a fair question. You are about to hand a document, maybe a private one, to a website you have never heard of. Whether that is safe depends almost entirely on one thing: where your file goes while it is being processed.
The short answer is that tools which run entirely in your browser are the safest kind, because your file never leaves your device. ThothBox is built this way — every tool processes your files locally, so the documents you work with stay with you.
A client-side tool runs in your browser tab. Your PDF is read on your device, processed there, and the result is generated locally. Nothing is sent to a server, which means there is no copy of your file sitting in a queue, no data to be logged, and no chance of a leak from a third party holding your document.
A server-side tool uploads your file to the site’s servers, where the real work happens. Even a service that promises to delete your file after an hour has still uploaded it and held a copy in the meantime. For sensitive or confidential documents, that is a meaningful difference in risk.
The giveaway is usually in the wording. Claims like “we delete your file after an hour” mean the file was uploaded in the first place. Tools that say processing happens in your browser, locally, or on your device are telling you the file never leaves you.
You can verify it yourself: many browser tools work even with your internet connection dropped, because no request needs to leave your machine. That is a strong sign the work is truly local. ThothBox follows this approach across all of its tools.
Yes when the tool runs in your browser locally, because your file never leaves your device.
No. Every ThothBox tool processes files in your browser, and nothing is sent to a server.
If a service says it deletes your file after an hour, it was uploaded. Browser-local tools never need to.
It is safest not to upload them at all — use a local tool so the document never leaves your device.
No — ThothBox and similar client-side tools work right away without registration.