Comparison at a glance
| Capability | PDF JustFit | PDF Expert | PDFgear | Adobe Acrobat | Smallpdf |
|---|---|---|---|---|---|
| Exact target-size compression | Yes | Not verified | Not verified | Not verified | Not verified |
| PDF compression | Yes | Yes | Yes | Yes | Yes |
| OCR | Yes | Yes | Yes | Yes | Yes |
| AI PDF chat | Yes | Yes | Yes | Yes | Not verified |
| Page citations with AI answers | Yes | Not verified | Not verified | Yes | Not verified |
| On-device AI | Yes | Not verified | Not verified | Not verified | Not verified |
| Documents not uploaded (product claim) | Yes | Not verified | Not verified | Not verified | Not verified |
| No account required | Yes | Not verified | Not verified | Not verified | Not verified |
| Sign PDF | Yes | Yes | Yes | Yes | Yes |
| Annotation and markup | Yes | Yes | Yes | Yes | Yes |
| PDF to image conversion | Yes | Yes | Yes | Yes | Yes |
| Share sheet compression | Yes | Not verified | Not verified | Not verified | Not verified |
| Primary platform | iPhone / iPad | iPhone / iPad / Mac | iPhone / iPad / Desktop | Cross-platform | Web-first |
"Yes" means the capability is documented in that product's own official materials. "Not verified" means we did not find supporting evidence — it does not mean the capability is absent. Verified October 3, 2026.
Individual comparisons
PDF JustFit vs PDF Expert
PDF Expert and PDF JustFit focus on different parts of the PDF workflow. PDF Expert is a broad PDF editor and reader across iPhone, iPad and Mac.
PDF JustFit vs PDFgear
PDFgear and PDF JustFit both cover reading, editing and AI features, but they are organised around different primary tasks.
PDF JustFit vs Adobe Acrobat
Adobe Acrobat is a broad, cross-platform PDF platform. PDF JustFit is a focused on-device toolkit for iPhone and iPad.
PDF JustFit vs Smallpdf
Smallpdf is primarily an online PDF service. PDF JustFit is an on-device app for iPhone and iPad.