Comparison at a glance
| Capability | PDF JustFit | Adobe Acrobat |
|---|---|---|
| Exact target-size compression | Yes | Not verified |
| PDF compression | Yes | Yes |
| OCR | Yes | Yes |
| AI PDF chat | Yes | Yes |
| Page citations with AI answers | Yes | Yes |
| 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 | Cross-platform |
"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
Adobe Acrobat
Adobe Acrobat is a broad, cross-platform PDF platform. PDF JustFit is a focused on-device toolkit for iPhone and iPad.
- Platforms: iOS / Android / Windows / macOS / Web
- Price: Free tier with paid subscription plans
- License: Proprietary
- Official site: www.adobe.com/acrobat.html
What Adobe Acrobat covers
- PDF editing, conversion and signing across many platforms
- AI Assistant on mobile that can answer questions about a PDF and summarise it
- In-document sources for AI answers
- Enterprise and document-cloud features
How PDF JustFit and Adobe Acrobat differ
Where processing happens
PDF JustFit states that compression, conversion, OCR and AI all run on-device, and that documents are never uploaded. Adobe Acrobat is a cross-platform platform with cloud and account features; we did not verify an equivalent "no upload" claim, so we mark it as not verified rather than asserting it.
Exact target-size compression
PDF JustFit lets you enter an exact target size and searches for the best quality at that size. Adobe documents PDF compression, but exact target-size compression was not verified.
Account requirement
PDF JustFit states that no account is required. Adobe Acrobat uses an Adobe account across its apps and services.
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 Adobe Acrobat 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
- Adobe — Ask questions with AI Assistant in Acrobat on mobile
- Adobe Acrobat official product page
- Apple App Store — PDF JustFit: Compress, AI Chat
Last verified: October 3, 2026
Frequently asked questions
Is PDF JustFit better than Adobe Acrobat?
PDF JustFit and Adobe Acrobat focus on different parts of the PDF workflow. Adobe Acrobat is a broad, cross-platform PDF platform. PDF JustFit is a focused on-device toolkit for iPhone and iPad. This page compares documented capabilities rather than declaring a winner.
Does Adobe Acrobat compress PDFs?
We could not verify PDF compression for Adobe Acrobat in the sources listed below, so this page marks it as not verified rather than stating it is unavailable.
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.