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File Extensions

Browse file extensions by category or letter. Learn what each file type is used for and find software that can open, view, edit, or convert it.

2
Indexed file extensions
Popular searches:
.DOCX .7Z .AUTOCAD (DWG, DXF) .PDF .TXT .OBJ (.OBJ)

Find the right information for any file extension

Use this directory to look up file formats, understand what files are used for, and find compatible applications for Windows, macOS, Linux, mobile, and online tools.

Search by extension Enter extensions like PDF, APK, DAT, HEIC, ZIP, or DOCX.
Browse categories Filter by documents, images, videos, archives, data, and more.
Open files safely Check file sources and use trusted software before opening unknown files.

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2 extensions
Programming Letter: Q Clear all
.QMD

Quarto Markdown Document

Quarto Markdown (.qmd) is an open-source scientific and technical publishing system built on Pandoc. It serves as the next-generation…

Programming
.QML

Qt Modeling Language File

QML (Qt Modeling Language) is a declarative user interface markup language used for designing and developing application interfaces wi…

Programming
.QMD

Quarto Markdown Document

Quarto Markdown (.qmd) is an open-source scientific and technical publishing system built on Pandoc. It serves as the next-generation version of R Markdown, de…

Programming
.QML

Qt Modeling Language File

QML (Qt Modeling Language) is a declarative user interface markup language used for designing and developing application interfaces within the Qt framework. It…

Programming

Frequently Asked Questions

Everything you need to know about file extensions

You can search by entering a file extension directly in the search bar or browse the directory by category or alphabetical index.

Each listing provides a definition of the file extension, common use cases, compatible software, supported platforms, and related or alternative formats.

The database is updated regularly to reflect new file extensions, changes in software compatibility, and evolving file format standards.