CAJ Reader · MADE FOR READING

On Mac, iPhone and iPad.Your CAJ documents. Ready to read.

Open a document and settle in. Chapters, search, reading progress and export, in a familiar native interface.

macOS 12+ · iOS 16+ · iPadOS 16+

A space for reading.caj

NOTES ON READINGCAJ READER

A space for reading

From gathering information to finding a thought

Abstract Reading begins with a quiet place. When documents are easy to open, navigate and organize, attention can return to the ideas within them. These notes explore the space between information and thought.

1. A space to read

A page is a place to pause. We make connections between paragraphs and leave questions in the margins. The rhythm of reading begins with attention to the ideas, with room for ideas to develop.

Document→Reading→Thought

Fig. 1 From a document to a thought

Clear chapters help us find a starting point. A comfortable layout lets the eye move freely. Returning to a familiar page gives yesterday’s questions another chance.

Interface illustration · Original sample document

OPEN A SUPPORTED DOCUMENT. START READING.CAJ / KDH / PDFSupported formats

OPEN. READ. UNDERSTAND.

One less conversion. More room to focus.

Open supported CAJ, KDH or PDF documents directly. Find a chapter or search the available text. Let the app prepare the document for you.

Chapters and thumbnails

Find your place by chapter or page.

Search and copy

Locate available text and take the excerpt you need.

A layout that fits

Adjust zoom, single-page or two-page viewing.

Help

Interface illustration · Original sample document

PICK UP WHERE YOU LEFT OFF

Close the document. Keep your place.

Your library keeps your documents and reading progress close at hand. Search by filename and return to the page you remember.

Reading progress stays on the current device. There is no cross-device sync.

ON THE DEVICE AT HAND

At your desk. Along for the day.

A space for reading.caj

NOTES ON READINGCAJ READER

A space for reading

From gathering information to finding a thought

1. A space to read

A page is a place to pause. We make connections between paragraphs and leave questions in the margins. The rhythm of reading begins with attention to the ideas, with room for ideas to develop.

Document→Reading→Thought

Fig. 1 From a document to a thought

Clear chapters help us find a starting point. A comfortable layout lets the eye move freely. Returning to a familiar page gives yesterday’s questions another chance.

Interface illustration · Original sample document

Mac

Open local documents and switch between them in native tabs. Original files remain read-only.

iPad

Import a document and enjoy more room for reading, search and chapters.

iPhone

Keep documents with you. Import from Files or receive them from a computer on the same Wi-Fi network.

TAKE THE NEXT STEP

Save a PDF. Take a page with you.

Export supported documents as PDF or save selected pages as images. Choose a folder on Mac, or use the system share sheet on iPhone and iPad.

Output depends on the source document and supported formats. Export does not add OCR or correct source text.

Export illustration

Your documents. On your device.

Reading and processing happen locally, without an account or cloud upload. Wi-Fi transfer receives files on your local network only while the transfer screen is open.

Privacy

ABOUT CAJ READER

A few good questions.

Does it open every CAJ file?

Currently supported: verified CAJ files containing embedded PDF, KDH 2.00, a limited subset of compressed HN, and standard PDF. Other HN variants, C8 and TEB are not supported. Files with the same .caj extension can use different internal formats.

Do I need to convert CAJ to PDF first?

No manual conversion is needed. Open a supported document in the app to read it. Use export when you want a separate PDF file.

How are documents stored?

Mac references the original file you select without copying or changing it. iPhone and iPad import an app-owned copy. Deleting a library item removes that copy, leaving the external original untouched.

Can I sync progress, annotate or use OCR?

Reading progress is restored on the current device. Cross-device sync, annotations and OCR are not included. Search and copy depend on the text available in the document.

Can I transfer from a computer to iPhone or iPad?

Yes. Connect to the same Wi-Fi, open Wi-Fi Transfer in the app, and enter the displayed address and verification code in your computer browser. A successful upload confirms the copy was saved, not that the document can be parsed.

More help

A little more space for your next read.

CAJ Reader. For Mac, iPhone and iPad.

Download on the App Store

macOS 12+ · iOS 16+ · iPadOS 16+