What is a WAR file?
WAR — Java web application
Use the format WAR
A concrete example
Prepare a ZIP archive of the resources of a WAR package.
Useful checks
A ZIP is not an application deployment. Check the internal folders and keep the original deployment package.
Choose a conversion
Keep the original and open the result in the software or on the device that will need to use it.
Your questions about this format
Why did I receive a TAR.GZ file?
Gzip compresses a stream, while TAR groups the files of a folder. The engine therefore combines the two to preserve the contents of a multi-part archive. Open the TAR.GZ with compatible software, then check the extracted files.
Does converting an archive change the documents inside?
The goal is to change their container, not to convert each document. A PDF in an archive remains a PDF. To change its format, extract it and then use the Documents theme.
Will a ZIP archive necessarily be smaller?
No. JPEG photos, videos, or already compressed archives may shrink very little. Compare the size and prioritize especially the format that your recipient knows how to open.
What to do with a protected or damaged archive?
The form does not ask for a password. Unlock your archive locally if you are allowed to, then try again with a copy. If it is damaged, first check that your local software can extract the files; paying does not repair an unreadable archive.
What is it?
WAR is a specialized JAR: it packages a complete Java web application — pages, code, libraries, configuration — ready to be deployed on a server.
The administrator drops it into the designated directory, and the server installs it automatically. It is the standard delivery format for web applications in the Java ecosystem.
History & origin
The format was defined in the late 1990s alongside the first specifications for Java web applications, at a time when the web was becoming a platform for enterprise applications.
It remains widely used in large organizations, including banks and government agencies.
Why it is useful
Deployment is simple and repeatable: a single file, a single operation.
It enforces a standardized structure, which makes applications interchangeable across servers.
Limits & drawbacks
It only makes sense within a server-side Java environment.
For any other use, it is an inert file.
Practical tips
To inspect a WAR file, convert it to ZIP: its internal structure becomes readable.
Only deploy it on a server whose configuration you fully control — it is executable code.
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Convert a WAR