APPUP Converter

Extract text from Erlang upgrade files (APPUP)


Drop or upload your .APPUP file
✈

How to extract text from your APPUP file

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

Convert APPUP to another file type

To convert APPUP upgrade files to another format, you need Erlang/OTP or other Developer software.

Convert a file to APPUP

To convert other file formats to the "Erlang Release Script" file type, you need software like Erlang/OTP or a similar tool.


About APPUP files

A .appup file is an Erlang Application Upgrade script used within the Erlang/OTP framework. It contains specific instructions for the release handler to perform hot code swapping, allowing a system to upgrade or downgrade a live application without stopping the virtual machine. These files are typically written and edited in text editors like Visual Studio Code or Emacs. The main disadvantage of the .appup format is its strict, proprietary syntax. It is written using Erlang terms, making it completely unreadable to non-developers and useless outside of the Erlang ecosystem. Because it is highly specialized, typical software and standard online converters fail to process it. If you need to share these instructions with non-technical teams, the best conversion targets are .TXT, .MD, or .PDF. Note that converting the file changes its structural syntax and removes its ability to function in an Erlang runtime. This file format is difficult to open or convert because it is a niche developer format with strict runtime expectations. Often, only an Erlang developer can properly read or export the data. If our analysis detects standard text, viewing or conversion to common text formats may still be possible.

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


FAQ

If you want to convert APPUP file to , you can use Erlang/OTP or similar software from the "Application State Upgrade Script" category. In the File menu, look for Save As… or Export….

To convert files to APPUP, try Erlang/OTP or another comparable tool in the "Application State Upgrade Script" category.



The APPUP 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 APPUP converter.