PDF24 is a German, free and very complete tool with a desktop app — a serious rival, and we'll say so. This comparison contrasts, with facts verifiable as of July 11, 2026, each one's model and what they offer.
| PDF24 | AIM PAPYR | |
|---|---|---|
| Model | Free, ad-supported | Free with no ads. Ever. |
| Your files | Processed on their servers (per their policy) | Discarded on response: zero retention |
| AI over the document | Limited | Chat with several PDFs with citations, an agent that proposes and runs on your approval, summaries — free daily allowance and EU-sovereign mode |
| Facturae / Spanish tax IDs / payslips | Doesn't exist | Validate Facturae 3.2.2, NIF/CIF/NIE, payslips to Excel |
| Analyse a contract with .ics alerts | Doesn't exist | Yes: extracts deadlines and downloads a calendar with an alarm |
| Verify whether a PDF was altered | Doesn't exist | Yes: local cryptographic verification + public QR seal |
| Active privacy | Not its focus | PDF X-ray, one-click anonymisation, EXIF report |
Yes: every classic tool is free, ad-free, CAPTCHA-free, card-free and account-free. AI features include a free daily allowance.
What PDF24 does well: it's free, very complete, has a desktop app for offline work and even fax features. If you need its desktop app or fax, it's a good option. We say it plainly.
Verified on July 11, 2026. If anything changes, we'll correct this page. · Español · iLovePDF · Smallpdf · Sejda · Adobe · Stirling · TinyWow · Full comparison