Guides

PDF JustFit Guides

Every guide follows the same structure: a short answer, when you need it, the steps, how PDF JustFit helps, and the limitations to be aware of.

Short answer: These guides explain how to compress a PDF to an exact size, OCR a scanned document, convert a PDF to images, sign a PDF, and ask questions about a long PDF — all on iPhone and iPad with PDF JustFit.

All guides

How to Compress a PDF on iPhone

Step-by-step: compress a PDF on iPhone or iPad, choose a target size, and check the result before you send it.

How to Compress a PDF to 2 MB

How to reduce a PDF to 2 MB or less — the common email attachment size — without losing readability.

How to Compress a PDF to 5 MB

How to reduce a PDF to 5 MB — a comfortable size for email and most upload forms — while keeping documents readable.

How to Compress a PDF for Email

How to bring a PDF under an email attachment limit, including compressing straight from Mail with the share sheet.

How to OCR a PDF on iPhone

How to extract text from a PDF and OCR a scanned document on iPhone or iPad so it becomes searchable.

How to Convert a PDF to JPG on iPhone

How to turn PDF pages into JPEG images on iPhone or iPad, one image file per page.

How to Convert a PDF to PNG on iPhone

How to turn PDF pages into lossless PNG images on iPhone or iPad — the better choice for text and line art.

How to Sign a PDF on iPhone

How to sign a PDF on iPhone or iPad with Apple Pencil or your finger, and export a flattened, share-ready PDF.

How to Chat with a PDF on iPhone

How to ask questions about a PDF and get answers with page citations, using on-device AI that works offline.

How to Summarize a PDF on iPhone

How to get a summary of a long PDF on iPhone or iPad using on-device AI, with page citations for anything you need to verify.

How to Compress a Scanned PDF

Why scanned PDFs are so large, and how to compress a scanned document to a target size without losing readability.

Keep your documents light, organized and private

PDF JustFit: Compress, AI Chat is available on the App Store for $9.99. Requires iOS/iPadOS 26.5 or later.