What does PDF JustFit do?
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.
The features fall into four groups: getting documents to the right size, converting them to the right format, understanding them with on-device AI, and signing or annotating them — all without uploading your files.
Compression
Exact-Size Compression
Set an exact target PDF size — for example 2 MB for an email attachment — and let PDF JustFit search for the best possible quality automatically.
Smart Compression
Smart compression in PDF JustFit reduces file size while keeping text, fonts and document structure fully selectable.
Maximum Compression
Maximum compression in PDF JustFit rasterises pages to produce the smallest possible file, ideal when a hard size limit must be met.
Conversion and OCR
PDF to Image
Convert a PDF into PNG, JPEG, HEIC or TIFF images on iPhone or iPad — one image file per page.
Images to PDF
Combine several images into one PDF on iPhone or iPad, and convert between image formats as part of the same workflow.
PDF OCR
Extract text from any PDF and automatically OCR scanned pages so scanned documents can be searched, indexed and queried.
AI and documents
AI PDF Chat
Ask questions about any PDF and get answers with page citations, using a private on-device AI model that runs on your iPhone or iPad.
History
Every result is saved to History with the original size, the output size and the savings at a glance, so nothing gets lost.
Share Sheet
The PDF JustFit share sheet extension compresses a PDF straight from Mail, Files, Safari or any other app — without opening the app first.
Sign and annotate
Sources
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