What is PDF JustFit?
PDF JustFit is an on-device PDF toolkit published by Nuanyue for iPhone and iPad. It compresses an oversized document to an exact target size — 2 MB for an email attachment, for example — using a two-stage solver, and offers four one-tap quality presets. It also converts between PDF, images and text, runs OCR on scanned pages, signs and annotates documents, and answers questions about a PDF with a private on-device assistant that cites page numbers. Compression, conversion, OCR and AI all run on the device; the only network use is a one-time AI model download of about 1 GB. It is a paid app listed at $9.99 on the App Store and requires iOS or iPadOS 26.5 or later.
Verified product facts
- Type
- PDF toolEditorially reviewed
- Platform
- iOS, iPadOS
- Pricing
- PaidDeveloper-stated
- Price
- USD 9.99(US App Store)Developer-stated
- Developer
- NuanyueDeveloper-stated
- Relationship to Nuanyue
- First-party product — published by Nuanyue
- Current version
- 1.0Developer-stated
- Official website
- pdfjustfit.nuanyue.com
Last updated . Facts marked developer-stated come from the developer and are not independently confirmed; editorially reviewed marks a Nuanyue judgement.
Key features
What PDF JustFit does at a glance.
Compresses to an exact target size
Such as 2 MB, using a two-stage solver
Four quality presets (Light, Balanced, Strong, Extreme) plus Smart and Maximum modes
Converts between PDF, images and text, and runs OCR on scanned pages
Signs and annotates documents
With Apple Pencil or a finger
Answers questions about a PDF on-device
With page citations
Processes files locally
No uploads, no account and no tracking
What you can use PDF JustFit for
- Shrinking a PDF to fit an upload or email size limit
- Converting a PDF to images or text, or the reverse
- Asking questions about a long document on a phone or tablet
- Working with sensitive documents that should not be uploaded
Who is PDF JustFit for?
- iPhone and iPad users who handle PDFs regularly
- People who need a PDF under a specific size limit
- Users who prefer document processing to stay on-device
Who is PDF JustFit not for?
- Mac users — PDF JustFit is an iPhone and iPad app, not a macOS app
- Users who need desktop-class page layout or prepress tools
Limitations
- iOS and iPadOS only; there is no macOS version
- Requires iOS or iPadOS 26.5 or later
Strengths and trade-offs
What PDF JustFit does well, and what to weigh before choosing it. Points marked developer-stated come from the developer’s own material and have not been independently confirmed.
Strengths
- Compresses to an exact target size — set 2 MB and a two-stage solver finds the best quality that fits, rather than offering only fixed presets.Developer-stated
- Compression, conversion, OCR and AI chat all run on-device; documents are not uploaded and no account is required.Developer-stated
- Bundles conversion, OCR, signing, annotation and on-device document chat in one iPhone and iPad app rather than several.Editorially reviewed
Trade-offs
- iOS and iPadOS only — there is no macOS or Windows version, and the developer notes that Mac compatibility is listed by the App Store but not verified for macOS.
- The on-device AI assistant needs an extra model download of about 1 GB before it works offline.Developer-stated
First-use experience
What the app asks of you when you set it up. Only established facts appear here; anything we could not confirm is left out rather than guessed at.
- Installation
- Install from the App Store on an iPhone or iPad running iOS or iPadOS 26.5 or later; the download is about 28 MB.
- First launch Developer-stated
- Opens on a document picker: choose a PDF from Files, or send one in from the share sheet, then pick a target size, a preset or another tool.
- System integration Developer-stated
- Adds a share-sheet extension so a PDF can be compressed from Mail, Files or Safari without opening the app first.
What it does
PDF JustFit is a PDF toolkit for iPhone and iPad that keeps its work on the device. It is built around one problem — a document that is too large for a limit — and then covers the surrounding jobs: converting, OCR, signing and annotating, and asking questions about a document.
Compressing to an exact size
Rather than offering only fixed presets, PDF JustFit lets you set a target — 2 MB for an email attachment, for example — and runs a two-stage solver that searches for the best quality that still fits. Four one-tap presets (Light, Balanced, Strong and Extreme) cover the common cases. Smart mode keeps text, fonts and structure selectable; Maximum mode rasterises pages for the smallest possible file. Each result is shown page by page against the original, and an already-optimised file is kept rather than made larger.
Conversion, OCR, signing and annotation
The app converts PDF to PNG, JPEG, HEIC or TIFF (one file per page) and merges images back into a PDF, extracting text with automatic OCR for scanned pages. Signatures can be drawn with Apple Pencil or a finger and exported as a flattened, share-ready PDF, and pages can be marked up with drawing, highlights and text.
On-device AI chat
Questions about a document are answered with page citations, so the source can be checked in one tap. The assistant runs on open models — Gemma 3 and Qwen3 — entirely on the device. The catch is a one-time model download of about 1 GB before it works offline; after that, no network is needed.
Not a Mac app
PDF JustFit is an iPhone and iPad app. The developer states that Mac compatibility is listed by the App Store but not verified for macOS, so it should not be treated as a desktop tool. It also requires iOS or iPadOS 26.5 or later, a recent floor.
Apple Silicon
Recorded as unknown. PDF JustFit is not distributed as a Mac app, and neither the product site nor the App Store listing states the architecture of a Mac build, so Nuanyue leaves the field unestablished rather than inferring it.
Release history
Dated releases recorded for PDF JustFit, newest first, each with the source it was read from.
1.0
Initial App Store release; the current version.
Source: Mac App Store
Questions about PDF JustFit
Is PDF JustFit free?
No. It is a paid download listed at $9.99 on the US App Store, with no free tier and no subscription.
Does PDF JustFit upload my PDFs?
According to the developer, no. Compression, conversion, OCR and AI chat are designed to run on-device, and the only network use is downloading AI model weights — never documents.Developer-stated
Which devices and OS does PDF JustFit need?
It is an iPhone and iPad app requiring iOS or iPadOS 26.5 or later. There is no macOS version.Developer-stated
How large is the AI model, and does chat work offline?
The recommended on-device model is about 1 GB and is downloaded once; after that, document chat works offline. It uses open models including Gemma 3 and Qwen3.Developer-stated
What is the latest PDF JustFit version?
1.0, released to the App Store on 22 September 2026.
Alternatives to PDF JustFit
Apps that could replace this one — the same job, a different trade-off.
PDFgear
Free PDF editor for Mac with AI chat, OCR and signing.
Both are AI-capable PDF tools, but PDFgear is a free Mac PDF editor while PDF JustFit is a paid, on-device iPhone and iPad toolkit.
Similar apps
Related in purpose, but not a straight swap.
CompressO
Free, open-source video and image compressor for macOS.
Both shrink files locally, but CompressO is an open-source Mac tool for video and images while PDF JustFit targets PDFs on iOS.
Neatwise
Analyze storage, clean unnecessary files and keep your Mac organized.
Both are Nuanyue apps for managing files on Apple devices, but Neatwise cleans a Mac's storage while PDF JustFit works with PDFs on iPhone and iPad.
PixPack
Batch image compression and format conversion that runs entirely on your Mac.
Both are Nuanyue compression tools that process files on-device, but PixPack compresses images on macOS while PDF JustFit handles PDFs on iOS.
Links
Sources
Facts on this page are checked against the sources below. Last updated .
