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Niraqua DjVu

Niraqua DjVu Help

Reading, text recognition, and PDF conversion run on your device. Download cloud files before opening them. Cloud storage and sharing use the services you choose.

It is a universal purchase: buy it once and use it on all three.

On iPhone or iPad? Everything specific to those apps - opening files, reading, searching, selecting and copying text, recognizing text, exporting, printing and sharing - is on On iPhone and iPad. The rest of this help describes the Mac app; the two share the same engine, so the topic pages below still explain what each feature does.

Requires macOS 14 Sonoma or later, or iOS 26 / iPadOS 26 or later.

What you can do

Section titled “What you can do”
  • Read .djvu files with continuous or two-page layouts, smooth zoom, and fit-to-window.
  • Search and select text, and copy it to the clipboard.
  • Recognize text on scanned pages with on-device OCR so they become searchable.
  • Duplicate, rename, or move the original .djvu.
  • Share the original .djvu through the macOS share sheet.
  • Export to PDF - all pages, the current page, or a page range - with a quality preset and an optional searchable text layer.
  • Print any open document through the standard macOS print dialog.
  • Quick Look a .djvu file in Finder without opening the app.

Why large files stay fast

Section titled “Why large files stay fast”

Niraqua opens local files with memory-mapped I/O, so it does not need to copy an entire book into memory before you can start reading. It decodes pages on demand, reuses prepared page data, preloads nearby pages, and keeps that work within a memory budget chosen for your device.

The reader and PDF exporter share a native Rust engine. Its busiest image processing loops use SIMD vector operations, which compile to NEON instructions on Apple silicon. The result is fast opening, smooth navigation through long, image-heavy documents, and quick PDF conversion without uploading the file.

Quick start on Mac

Section titled “Quick start on Mac”
  1. Open a document by double-clicking a .djvu file in Finder.
  2. Read and navigate with the scroll wheel, the zoom shortcuts, or the thumbnail sidebar.
  3. If the page has no usable text, run text recognition. Search DjVu files and recognize scanned text
  4. Export to PDF when you want to share or archive the document.

All topics

Section titled “All topics”

Need more help?

Section titled “Need more help?”

Email [email protected] and we will get back to you.

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