Technical MIME Specification & Web Server Guide

application/x-plain

Technical overview, official IANA specification, header magic bytes, and server configuration snippets for .PLAIN files (PLAIN File Format).

File Extension

.plain

Content-Type Header

application/x-plain

Format Category

General Files

Standard Specification

IANA Registered Standard

Description & Usage

Binary or text file format identified by extension .plain

HTTP Server Content-Type Configuration Code

# Nginx mime.types configuration for .plain
types {
    application/x-plain    plain;
}

OS Compatibility Matrix

Windows

macOS

Linux

Android

iOS

Want to test header signatures or binary files?

Run binary magic byte inspection in Magic Byte Detector.

Frequently Asked Questions

The official MIME content type for .plain files is "application/x-plain". Web servers use this header to instruct browsers how to render or process .plain data.