Skip to content

Can You Convert CAJ, KDH and NH Papers to PDF on iPhone?

Open supported academic paper files with Fileso and understand why PDF-based variants can convert while some scanned CAJ and NH files cannot.

2 min readFileso

Fileso can preview and convert supported CAJ, KDH, and NH academic-paper files to PDF on iPhone and iPad. Compatibility depends on the internal format, not only the extension. Some files contain recoverable PDF data, while other variants use scanned-page encodings that this converter cannot process.

Which files can convert?

Supported paths include PDF-based CAJ containers, supported KDH files, and documents that are already PDFs under another extension. Some image-based variants work only when a complete embedded PDF can be found inside them.

Image-only HN, C8, or TEB-style variants without that usable PDF payload are not generally convertible by Fileso. A .caj or .nh suffix alone is therefore not a promise of success.

Try the paper in Fileso

  1. Download the complete paper from a source you are authorized to use.
  2. Save it locally in Fileso.
  3. Open the file and wait while Fileso attempts PDF conversion for preview.
  4. If it succeeds, inspect the title page, several inner pages, and the final page.
  5. Use the file conversion action to create a PDF copy when you need a separately saved output.
  6. Reopen that output before sharing or annotating it.

Retain the source paper. A successful preview is useful evidence that the pages render, but the saved PDF should still be reviewed as a separate result.

Understand conversion errors

A message about an unsupported scanned format means this conversion path does not support that internal representation. It does not necessarily mean the paper is corrupt. A missing-PDF-data or damaged-document error can also indicate a different variant or an incomplete download.

If your source offers a normal PDF version, downloading it directly is often the clearest alternative. Repeatedly renaming the same source to .pdf does not reconstruct missing PDF structures or decode unsupported scanned pages.

Check searchability separately

Rendering a paper as a PDF does not guarantee selectable text, correct bookmarks, or searchable formulas. Try selecting a paragraph and inspect tables and equations visually. If the result contains image-only pages, PDF to Text can attempt OCR, but its output needs proofreading and will not reproduce every academic layout.

Fileso

File manager, PDF editor and powerful file tools

App Store

Ready to try it?

Fileso · File manager, PDF editor and powerful file tools

Free on the App Store