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.SGM·File Extension

SGM Data & Text — A .sgm file is a SGM Data & Text. It is a text-based data format widely used for configuration files, data interchange and API payloads.

Data & Texttext/sgml

Quick facts

Extension.sgm

File typeSGM Data & Text

MIME typetext/sgml

CategoryData & Text

Charset—

Compressible—

What is .sgm

What is a .sgm file?

A .sgm file is a SGM Data & Text. It is a text-based data format widely used for configuration files, data interchange and API payloads.

In the mime-db registry it maps to text/sgml. When serving .sgm over HTTP, set the Content-Type header as shown in Developer info below.

Related entities: it maps to text/sgml — and is delivered over HTTP via the Content-Type header.

How to open .sgm files

Use VS Code or Notepad++ to open and edit .sgm files.
Any text editor (Notepad, VS Code) can inspect the raw content as text.

Developer info

When served over HTTP, responses should set the following header:

Content-Type: text/sgml

Common software that reads/writes .sgm:

VS CodeNotepad++Sublime Textjq

Relation chain

.sgmextension of

format

SGM Data & Textserved as

mime type

text/sgmlsent via header

http header

Related extensions

Related MIME types

Common uses

Configuration files
Data interchange between systems
API request and response payloads
Logs and data exports

How to edit .sgm files

Open the file with VS Code, make your changes and save.
Most editors preserve the original formatting and encoding — avoid changing the charset.

How to create .sgm files

Create a new file and save it with the .sgm extension, or export this format from VS Code.

Frequently asked questions

What programs can open .sgm files?

Common options include VS Code, Notepad++, Sublime Text. You can also open many of these files with built-in viewers or a browser.

How do I create a .sgm file?

Create a new file in any text editor or the app that owns the format and save it with the .sgm extension.

What is the relationship between .sgm and the text/sgml MIME type?

text/sgml is the media type identifier used for .sgm files during network transfer (for example in the HTTP Content-Type header).

Sources & standards

Updated 2026-09-13

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