iLovePDF vs Smallpdf vs PDF24: Which Free PDF Tools Are Actually Private?
By the PdfToolbox team · June 11, 2026
Search for any PDF task and the same names dominate the results: iLovePDF, Smallpdf, PDF24. They look interchangeable — drag a file in, click a button, download the result. The real difference isn’t the feature list. It’s what happens to your file in between.
The question that matters: where does the work happen?
There are only two architectures for a “free online PDF tool”:
- Server-side: your file is uploaded, processed on the company’s machines, and the result is sent back. The privacy promise is a policy (“we delete files after X hours”).
- Client-side: the processing runs as JavaScript in your browser. The file never leaves your device, so there’s nothing to delete and no policy to trust.
Here’s where each service stands, based on their own documentation at the time of writing.
iLovePDF — server-side, account-encouraged
iLovePDF uploads your files to its servers for processing and states that they’re deleted after a few hours. The free tier comes with file-size and task limits, and many features nudge you toward an account and a Premium plan. Perfectly capable software — but a contract, payslip or medical record you process there does spend time on someone else’s infrastructure. Full comparison →
Smallpdf — server-side, freemium limits
Same architecture: upload, process, download, with files deleted after an hour according to their policy. The free tier caps you at a couple of tasks per day, and the Pro upsell is ever-present. Again — the privacy guarantee is a deletion policy you can’t observe, not a technical property you can verify. Full comparison →
PDF24 — a hybrid: local desktop app, server-side web tools
PDF24 deserves credit: its free Windows desktop app (PDF24 Creator) processes files locally on your PC, and it’s genuinely free without artificial limits. The catch is the part most people actually use — the online tools at pdf24.org — which upload files to PDF24’s servers (hosted in Germany, with prompt deletion per their policy). Local privacy on the desktop doesn’t carry over to the browser tools, and the desktop app is Windows-only.
The in-browser alternative
Private PDF (this site) takes the fourth option: client-side processing in the browser, on any platform. Merging, compressing, even removing a password all run locally — no upload, no account, no daily limits, and nothing to take on faith. Open your browser’s DevTools Network tab while a tool runs and you can watch zero bytes leave your machine. That’s the difference between a deletion policy and a verifiable guarantee.
Quick comparison
| iLovePDF | Smallpdf | PDF24 (web) | Private PDF | |
|---|---|---|---|---|
| File uploaded to a server | Yes | Yes | Yes | Never |
| Privacy model | Deletion policy | Deletion policy | Deletion policy | Verifiable, local |
| Account for full use | Yes | Yes | No | No |
| Daily limits on free tier | Yes | Yes | No | No |
| Works offline after loading | No | No | No | Yes |
If a tool is free, fast and does the job, any of these will get you through the day. If the document matters — anything with your name, salary or signature on it — pick the architecture where the question “what do they do with my file?” doesn’t need an answer. More side-by-sides live in the comparison hub.