PDF JustFit: Compress, AI Chat

Convert, OCR, sign & annotate

$9.99 · Designed for iPad. Not verified for macOS.

Shrink any PDF to an exact target size, convert to images or text, sign and annotate pages, and ask an on-device AI about any document. No account, no ads, no tracking. PDF JustFit is the all-in-one PDF toolkit that runs entirely on your device. Compress oversized documents to the exact size you need, convert between PDF, images and text, sign and annotate pages, and chat with any document using a private on-device AI assistant. No uploads, no account, no tracking — your files never leave your iPhone or iPad. COMPRESS TO ANY TARGET SIZE • Set an exact target size — for example 2 MB for an email attachment — and the two-stage solver searches for the best possible quality automatically • Four one-tap quality presets: Light, Balanced, Strong and Extreme • Smart mode keeps text, fonts and structure fully selectable; Maximum mode rasterizes pages for the smallest possible file • Built for scanned documents, long exam papers and image-heavy reports • Compare before and after side by side, page by page, so you can trust the result CONVERT ANYTHING • PDF to images in PNG, JPEG, HEIC or TIFF — one file per page • Combine several images into a single PDF • Extract text from any PDF, with automatic OCR for scanned pages • Convert between image formats and package the results as a tidy ZIP AI CHAT, PRIVATE AND ON-DEVICE • Ask questions about any PDF and get answers with page citations, so you can check the source in one tap • Runs 100% on your device with open models — no internet needed once the model has been downloaded • Scanned documents are OCR-recognized automatically, so nothing is left out of the index • Your documents are never uploaded; questions and answers stay on your iPhone and iPad SIGN AND ANNOTATE • Draw, highlight, erase, add text and place your handwritten signature with Apple Pencil or your finger • Export flattened, share-ready PDFs in a single tap KEEP EVERYTHING {ORGANIZED} • Every result is saved to History with the original size, the output size and the savings at a glance • Re-share or re-export any earlier output at any time COMPRESS FROM ANYWHERE • The built-in share sheet extension compresses a PDF straight from Mail, Files, Safari or any other app — the result flows back into PDF JustFit automatically PRIVATE BY DESIGN • Compression, conversion, OCR and AI all run on-device • No account, no analytics, no advertising • The network is used for one thing only — downloading AI model weights, never your documents PERFECT FOR • Students shrinking lecture slides, papers and textbooks • Office teams sending contracts, invoices and reports through email size limits • Anyone tidying up receipts, forms and scanned ID copies • Readers who would rather ask a question about a long PDF than scroll through it FORMATS AND SPECS • Read and write: PDF, PNG, JPEG, HEIC, TIFF, TXT, ZIP • Compression modes: Smart (text stays selectable) and Maximum (smallest possible file) • AI models: Gemma 3 and Qwen3, downloaded once and then fully offline • Share sheet extension for Mail, Files, Safari and any other app • Requires iOS 26.5 or later · iPhone and iPad · Apple Pencil supported GOOD TO KNOW • Open the app, pick a PDF from Files, then choose either a target size or a quality preset — PDF JustFit works out the rest • For AI chat, download the recommended on-device model once (about 1 GB); after that everything works offline • Add the share sheet extension and you can compress a PDF without ever opening the app • If a PDF is already fully optimized, your original file is kept rather than producing something larger • Password-protected PDFs are reported straight away instead of failing silently • Very large scanned documents are handled page by page so memory stays under control • Fully localized in 50 languages, including right-to-left support • Simple enough for a first-time user, powerful enough for a 500-page scan • Designed for iPhone and iPad alike • Nothing is written back to your Photos or Files unless you choose to save it there Download PDF JustFit and keep your documents light, organized and private. Also supported: pdf, ocr, jpg, png, zip, txt, doc, img, heic, tiff, webp, ipad

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The developer, 章毅 许, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

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    Accessibility

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    Information

    Seller
    章毅 许
    Size
    29.3 MB
    Category
    Productivity
    Compatibility
    Requires iOS 26.5 or later.
    • iPhone
      Requires iOS 26.5 or later.
    • iPad
      Requires iPadOS 26.5 or later.
    • Mac
      Requires macOS 26.5 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 26.5 or later.
    Languages
    English and 43 more
    • English, Arabic, Bengali, Catalan, Croatian, Czech, Danish, Dutch, Finnish, French, German, Greek, Gujarati, Hebrew, Hindi, Hungarian, Indonesian, Italian, Japanese, Kannada, Korean, Malay, Malayalam, Marathi, Norwegian Bokmål, Oriya, Polish, Portuguese, Punjabi, Romanian, Russian, Simplified Chinese, Slovak, Slovenian, Spanish, Swedish, Tamil, Telugu, Thai, Traditional Chinese, Turkish, Ukrainian, Urdu, Vietnamese
    Age Rating
    4+
    Copyright
    Copyright © 2026 PDF JustFit. All rights reserved.
  • Privacy Policy

    • Supports

    • Family Sharing

      Up to six family members can use this app with Family Sharing enabled.

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