lookup> .sass

.SASS·File Extension

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

Data & Texttext/x-sass

Quick facts

Extension.sass

File typeSASS Data & Text

MIME typetext/x-sass

CategoryData & Text

Charset—

Compressible—

What is .sass

What is a .sass file?

A .sass file is a SASS 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/x-sass. When serving .sass over HTTP, set the Content-Type header as shown in Developer info below.

Related entities: it maps to text/x-sass and is used by Sass among others — and is delivered over HTTP via the Content-Type header.

How to open .sass files

Use VS Code or Notepad++ to open and edit .sass 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/x-sass

Common software that reads/writes .sass:

VS CodeNotepad++Sublime Textjq

Relation chain

.sassextension of

format

SASS Data & Textserved as

mime type

text/x-sasssent via header

http header

Related extensions

Related MIME types

Related programming languages

Sass

.sass

Common uses

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

How to edit .sass 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 .sass files

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

Frequently asked questions

What programs can open .sass 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 .sass file?

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

What is the relationship between .sass and the text/x-sass MIME type?

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

Sources & standards

Updated 2026-08-18

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