Nearly everyone eventually needs to merge two PDFs, shrink one enough to email, or turn one into a Word document. Three tools dominate that job — Smallpdf, iLovePDF and PDF24 — and they look similar until you hit their limits, which is exactly when it matters.
Before comparing tools it helps to separate the jobs, because they place very different demands on a service:
All three tools cover most of this. The differences are in how much they let you do before asking for money, and what happens to your file in the meantime.
| Criterion | Smallpdf | iLovePDF | PDF24 |
|---|---|---|---|
| Registration for basic use | Not required | Not required | Not required |
| Free daily task limit | Yes, limited | Limited by file size | No meaningful limit |
| File size cap (free) | Capped | Varies by tool | Generous |
| Watermark on output | None | None | None |
| Offline desktop version | Yes | Yes | Yes, fully offline |
| Interface polish | Best | Very good | Utilitarian |
| Conversion quality | Very good | Good | Good |
Smallpdf has the most polished interface of the three, and for a first-time user that counts for a lot. Every tool is a single drop zone, results arrive quickly, and PDF-to-Word conversion preserves formatting well.
The constraint is the free tier: a limited number of tasks per day and caps on file size. That is fine if you handle a PDF occasionally, frustrating if you process them regularly. Paid plans remove the limits.
iLovePDF offers the widest tool list and keeps most of it free without registration. Beyond the standard merge/split/compress set it handles page numbers, watermarks, OCR, unlocking and protection.
The important nuance is that limits are per tool. Office-format conversion typically carries a lower size cap than merging or editing, so a large file may fail on one task and succeed on another.
Its desktop version is worth installing if you handle PDFs often, since it processes locally.
PDF24 is the least glamorous and, for many people, the most useful. There is no registration, no watermark, and — unusually — no meaningful task limit. The web interface looks dated but does everything the others do.
Its real advantage is the desktop application, which runs fully offline on Windows. For contracts, financial documents, medical records or anything else you would rather not upload, this is the strongest option of the three.
If you have ever been stopped mid-task by a "you have reached your daily limit" message, PDF24 is the answer.
You value a clean interface and work with PDFs occasionally. The daily limit will rarely bother you.
You need a specific tool from a long list — page numbers, OCR, batch operations — and free access without registering matters.
You process PDFs regularly, want no limits at all, or handle confidential documents and can use the offline desktop version.
PDF24 has no meaningful task limits on its free web tools and also offers a fully offline desktop application.
No. All three work without registration for basic tasks, though limits apply.
Yes, all three upload files for processing on their web versions. Install the desktop application if confidentiality matters.
Smallpdf generally produces the best formatting fidelity, though results depend on how complex the original layout is.
File size caps vary by tool and by task. Office-format conversion is usually capped lower than merging or editing.
Yes. All three offer compression, and choosing the stronger compression level typically brings a large scan down well under email attachment limits.