DEF Converter

Extract text from DEF files


Drop or upload your .DEF file
✈

How to extract text from your DEF file

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

Convert DEF to another file type

To convert your DEF file to another format, you need Notepad++ or other Developer software.

  • DEF to LIB
  • DEF to JS
  • DEF to TS
  • DEF to PY
  • DEF to JAVA
  • DEF to CPP
  • DEF to C
  • DEF to CS
  • DEF to PHP
  • DEF to RB
  • DEF to GO
  • DEF to RS

Convert a file to DEF

To convert other file formats to the "Source Definition File" file type, you need software like Notepad++ or a similar tool.

  • SH to DEF
  • PY to DEF
  • KT to DEF
  • PS1 to DEF
  • SWIFT to DEF
  • LUA to DEF
  • PL to DEF
  • JAVA to DEF
  • SCALA to DEF
  • JS to DEF
  • VBS to DEF
  • TS to DEF

About DEF files

DEF (Definition) files are plain text configuration or source files used to define exports, settings, or character attributes across various industries. The most common use is within the M.U.G.E.N fighting game engine, where the file acts as the "brain" of a character, linking sprites (SFF) and sounds (SND) to animations (AIR) and constants (CNS). Another major use is the Module-Definition file in Windows development (Visual Studio), which lists exported functions and attributes for a Dynamic Link Library (DLL) or executable.

Because the .def extension is generic, users often face the "Ambiguous Association" problem - Windows does not know which software created the file. While M.U.G.E.N files are readable text, proprietary formats like the SmartWare II data file or IObit Malware Fighter definitions may be binary or encrypted, making them impossible to view in standard editors. Opening a raw .def file in the wrong program often results in garbled text or launch errors. Furthermore, editing these files manually requires strict adherence to syntax (e.g., C++ linker commands or M.U.G.E.N block structures); a single missing bracket can crash the associated application.

For documentation, code review, or archiving, the best strategy is converting .def files to PDF. This preserves the syntax formatting and prevents accidental modification. For immediate inspection to determine the file's origin, converting or renaming to TXT allows users to check headers (e.g., looking for LIBRARY statements for C++ or [Info] blocks for games). Users working with Cadence EDA software may also encounter Design Exchange Format .def files, which should often remain in their native format but can be viewed as text or converted to PDF for sharing layout data.

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

Users also converted SFF, CS2AGBIBR6, NEF, ACT, AI, TXT, DWF, DXF, WEBP, NFO, DIZ and LIB files.



The DEF 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 DEF converter.