HDM Converter

Extract text from HDM files


Drop or upload your .HDM file
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How to extract text from your HDM file

  1. Click the "Select File" button above, and choose your HDM file.
  2. You’ll see a preview, if available.
  3. Click the "Convert file to..." button to extract text information.

Convert HDM to another file type

To convert your HDM file to another format, you need Neko Project II or other Disk Image software.

  • HDM to PDF
  • HDM to HTML
  • HDM to HTM
  • HDM to CSS
  • HDM to JS
  • HDM to PHP
  • HDM to ASP
  • HDM to ASPX
  • HDM to JSP
  • HDM to JSPX
  • HDM to PY
  • HDM to RB

Convert a file to HDM

To convert other file formats to the "Emulation Disk Dump" file type, you need software like Neko Project II or a similar tool.

  • RSS to HDM
  • CSS to HDM
  • CGI to HDM
  • SITEMAP to HDM
  • PL to HDM
  • WEBMANIFEST to HDM
  • JSON to HDM
  • JS to HDM
  • XML to HDM
  • HTML to HDM
  • ICO to HDM
  • HTM to HDM

About HDM files

The .HDM extension primarily identifies a PC-98 Disk Image, a raw data dump of a floppy or hard disk from the NEC PC-9801 series of Japanese microcomputers. These binary files are essentially digital preservation capsules used today with emulators like Neko Project II or Anex86 to run retro games and software. The main limitation for users is that .HDM files are unreadable by modern operating systems (Windows, macOS) and require specific emulator configurations - often with Japanese BIOS files and Shift-JIS character encoding - to function. They are distinct from the more common HDI (Hard Disk Image) or FDI formats, leading to compatibility errors in certain emulator builds.

For archival or extraction purposes, users often need to convert these disk images into raw binary IMG files or extract specific contents to standard formats using tools like DiskExplorer.

A secondary, less common use of this extension is for Handheld Device Markup Language (HDML) files. Developed by Openwave, this text-based format was a precursor to WML for early mobile web browsing. These files are now obsolete and incompatible with modern browsers; converting them to HTML or TXT is the only way to inspect the legacy code structure.

Convert.Guru analyzes your HDM file, detects the exact format, and lets you read the text inside.

Users also converted HTM, HTML, PDF, UMD, VGA and D80 files.



The HDM Converter Story

The history of Convert.Guru began over 25 years ago in California with Tom Simondi’s file-format database. A former contributor to Space Shuttle development and a software pioneer of the 1980s, Simondi established a trusted resource for file type analysis that was even referenced by Microsoft Windows XP. Today, we use modern technology to process and convert thousands of file formats while continually improving our HDM converter.