BNF Converter

Extract text from grammar or database files (BNF)


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

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

Convert BNF to another file type

To convert BNF data files to another format, you need Nuance Dragon NaturallySpeaking or other Developer software.

Convert a file to BNF

To convert other file formats to the "Syntax Grammar File" file type, you need software like Nuance Dragon NaturallySpeaking or a similar tool.


About BNF files

The .BNF extension most prominently refers to files containing Backus-Naur Form syntax, a notation technique used to describe the context-free grammars of languages. These are frequently utilized in speech recognition software like Nuance Dragon NaturallySpeaking to define command structures. While technically plain text, these files often lack a default association in Windows or macOS, forcing users to manually select a text editor to view the raw code. A significant portion of .BNF files are alternatively binary data files for OID3 Talking Pen books or database backups for Booknizer. These proprietary variations create a major drawback: they appear as unreadable "gibberish" in standard editors and are entirely locked to their specific hardware or legacy software. Users typically need to convert text-based BNF files to PDF for technical documentation or TXT for universal compatibility. For the proprietary binary variants, conversion options are limited, but extracting readable strings or converting to a hex dump for analysis is a common workaround.

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

Users also converted ZIP, SDEF, DRA and MOF files.


FAQ

If you want to convert BNF file to JS, TS, PY, JAVA, CPP, C, CS, PHP, RB, GO, RS or SWIFT, you can use Nuance Dragon NaturallySpeaking or similar software from the "Speech Recognition Grammar" category. In the File menu, look for Save As… or Export….

To convert SH, PY, KT, PS1, SWIFT, LUA, PL, JAVA, SCALA, JS, VBS or TS files to BNF, try Nuance Dragon NaturallySpeaking or another comparable tool in the "Speech Recognition Grammar" category.



The BNF 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 BNF converter.