Comparison at a glance
| Capability | PDF JustFit | Smallpdf |
|---|---|---|
| Exact target-size compression | Yes | Not verified |
| PDF compression | Yes | Yes |
| OCR | Yes | Yes |
| AI PDF chat | Yes | Not verified |
| Page citations with AI answers | Yes | Not verified |
| On-device AI | Yes | Not verified |
| Documents not uploaded (product claim) | Yes | Not verified |
| No account required | Yes | Not verified |
| Sign PDF | Yes | Yes |
| Annotation and markup | Yes | Yes |
| PDF to image conversion | Yes | Yes |
| Share sheet compression | Yes | Not verified |
| Primary platform | iPhone / iPad | 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.
Product definitions
PDF JustFit
PDF JustFit is an on-device PDF toolkit for iPhone and iPad that compresses PDFs to an exact target size, converts and OCRs documents, lets users ask questions about PDFs with local AI, and provides signing and annotation tools.
- Platforms: iPhone / iPad
- Price: $9.99 (US)
- Distribution: Apple App Store
- Privacy label: Data Not Collected
Smallpdf
Smallpdf is primarily an online PDF service. PDF JustFit is an on-device app for iPhone and iPad.
- Platforms: Web / iOS / Android / Desktop
- Price: Free tier with paid subscription plans
- License: Proprietary
- Official site: smallpdf.com
What Smallpdf covers
- Online PDF compression, conversion and editing
- Mobile PDF scanning with OCR
- A large catalogue of browser-based PDF tools
- Cloud storage integration
How PDF JustFit and Smallpdf differ
Online service vs on-device app
Smallpdf is an online service: its tools run through its website and apps. PDF JustFit states that compression, conversion, OCR and AI run on-device, and that documents are never uploaded. This is the most fundamental difference between the two approaches.
Exact target-size compression
PDF JustFit takes an exact target size as input. Smallpdf documents PDF compression, but exact target-size compression was not verified.
AI document chat
PDF JustFit documents on-device AI document chat with page citations. Equivalent AI document chat in Smallpdf was not verified.
When PDF JustFit is the better fit
- You need a PDF compressed to an exact target size, not a quality level.
- You want AI document chat that runs on-device with page citations.
- You would rather not upload documents to an online service.
- You want to compress a PDF straight from Mail, Files or Safari.
- You do not want to create an account.
When Smallpdf may be the better fit
- You need a PDF tool across more platforms than iPhone and iPad.
- You want a broad PDF editor rather than a focused on-device toolkit.
- You prefer an online service or a subscription model.
Sources for this comparison
Last verified: October 3, 2026
Frequently asked questions
Is PDF JustFit better than Smallpdf?
PDF JustFit and Smallpdf focus on different parts of the PDF workflow. Smallpdf is primarily an online PDF service. PDF JustFit is an on-device app for iPhone and iPad. This page compares documented capabilities rather than declaring a winner.
Does Smallpdf compress PDFs?
Yes. Smallpdf documents PDF compression in its official materials. Exact target-size compression was not verified.
Why does this comparison say "Not verified"?
Because a claim we cannot support with the competitor's own documentation should not be published as fact. "Not verified" means we did not find evidence — not that the capability is absent.
Sources
Last verified: