What Is a .deb File? .deb Format, MIME & How to Open

Quick facts

Extension.deb

File typeDebian Package

MIME typeapplication/octet-stream

CategoryData & Text

Charset—

CompressibleYes

Format familydeb

What is .deb

What is a .deb file?

A .deb file is a Debian Package — Debian/Ubuntu software package.

In the mime-db registry it maps to application/octet-stream, and it is marked as compressible. When serving .deb over HTTP, set the Content-Type header as shown in Developer info below.

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

How to open .deb files

Use dpkg or apt to open and edit .deb 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: application/octet-stream

Common software that reads/writes .deb:

dpkgapt7-Zip

Relation chain

.debextension of

format

debserved as

mime type

application/octet-streamsent via header

http header

Related extensions

Related MIME types

application/octet-stream

.bin .dms .lrf

application/x-debian-package

.deb .udeb

Common uses

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

How to edit .deb files

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

How to create .deb files

Create a new file and save it with the .deb extension, or export this format from dpkg.

Frequently asked questions

What programs can open .deb files?

Common options include dpkg, apt, 7-Zip. You can also open many of these files with built-in viewers or a browser.

How do I create a .deb file?

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

What is the relationship between .deb and the application/octet-stream MIME type?

application/octet-stream is the media type identifier used for .deb files during network transfer (for example in the HTTP Content-Type header).

Sources & standards

Updated 2026-09-13

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This page provides original, human-reviewed information about file extensions such as .deb, the File Extension Reference and related concepts. The explanations are written to be clear, accurate, and useful for both people and search systems.

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