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.
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.
Refine your search with categories and letters
Pickle is a Python-specific file format used for serializing and de-serializing Python object structures. It allows you to save the st…
A .CATPart file is a 3D CAD (Computer-Aided Design) part file created by CATIA (Computer-Aided Three Dimensional Interactive Applicati…
The SDB file extension is primarily associated with StarOffice and OpenOffice.org, specifically their database component, Base. It rep…
HTML (HyperText Markup Language) is the standard markup language for creating web pages. It provides the structure and content of a we…
A .bip file is a Binary Image Partition file, often associated with firmware images for embedded systems and devices. These files typi…
The SRT (SubRip Subtitle) file format is a plain text file format used to store subtitles for video content. It's one of the most basi…
An LDF file is a log file used by Microsoft SQL Server. It contains a record of all transactions and database changes made to a corres…
A .psql file is a plain text file containing SQL queries designed to be executed against a PostgreSQL database. These files are essent…
The .gnumeric file extension is associated with spreadsheet files created by Gnumeric, a free and open-source spreadsheet program. Gnu…
A DMP file, short for Memory Dump file, is a snapshot of a computer's memory at a specific point in time. These files are typically cr…
STL (Stereolithography) is a file format native to the stereolithography CAD software created by 3D Systems. STL files describe only t…
A .hdd file is a hard disk image file, essentially a complete sector-by-sector copy of a physical hard drive or a partition. It contai…
The .pol file extension is associated with Plain Old Telephone (POT) data files. These files typically contain configuration informati…
The APKM file extension typically refers to the manifest file associated with an Android Package Kit (APK). While the APK itself is an…
The Drawing Exchange Format (DXF) is a CAD (Computer-Aided Design) data file format developed by Autodesk for enabling data interopera…
A .reg file is a text-based file format used by Microsoft Windows to store and import registry settings. The Windows Registry is a hie…
NetCDF (Network Common Data Form) is a set of software libraries and self-describing, machine-independent data formats that support th…
AsciiDoc is a human-readable document format that is semantically equivalent to DocBook XML, but uses a plain text markup language. It…
The .drawio file format is used by draw.io (now diagrams.net), a free, open-source diagramming application. It stores diagrams, flowch…
A plain text file (.txt) is a simple, unformatted document that contains only text characters, adhering to a character encoding standa…
X3D (Extensible 3D Graphics) is an open, royalty-free ISO standard for defining 3D computer graphics. It is the successor to VRML (Vir…
The ASX file format, short for Advanced Stream Redirector, is a type of XML-based metafile used by Microsoft's Windows Media Player. I…
MHTML (MIME HTML) is a web page archive format used to combine, in a single document, the HTML code and its associated resources such…
The Esri Grid format is a raster data storage format used by Esri's ArcGIS software for representing geographic data. It's a fundament…
Pickle is a Python-specific file format used for serializing and de-serializing Python object structures. It allows you to save the state of Python objects (li…
A .CATPart file is a 3D CAD (Computer-Aided Design) part file created by CATIA (Computer-Aided Three Dimensional Interactive Application), a multi-platform sof…
The SDB file extension is primarily associated with StarOffice and OpenOffice.org, specifically their database component, Base. It represents a database file c…
HTML (HyperText Markup Language) is the standard markup language for creating web pages. It provides the structure and content of a webpage, defining elements…
A .bip file is a Binary Image Partition file, often associated with firmware images for embedded systems and devices. These files typically contain a specific…
The SRT (SubRip Subtitle) file format is a plain text file format used to store subtitles for video content. It's one of the most basic and widely supported su…
An LDF file is a log file used by Microsoft SQL Server. It contains a record of all transactions and database changes made to a corresponding SQL Server databa…
A .psql file is a plain text file containing SQL queries designed to be executed against a PostgreSQL database. These files are essentially scripts that can be…
The .gnumeric file extension is associated with spreadsheet files created by Gnumeric, a free and open-source spreadsheet program. Gnumeric is designed to be a…
A DMP file, short for Memory Dump file, is a snapshot of a computer's memory at a specific point in time. These files are typically created when a program cras…
STL (Stereolithography) is a file format native to the stereolithography CAD software created by 3D Systems. STL files describe only the surface geometry of a…
A .hdd file is a hard disk image file, essentially a complete sector-by-sector copy of a physical hard drive or a partition. It contains all the data, file sys…
The .pol file extension is associated with Plain Old Telephone (POT) data files. These files typically contain configuration information or data related to tel…
The APKM file extension typically refers to the manifest file associated with an Android Package Kit (APK). While the APK itself is an archive containing all t…
The Drawing Exchange Format (DXF) is a CAD (Computer-Aided Design) data file format developed by Autodesk for enabling data interoperability between AutoCAD an…
A .reg file is a text-based file format used by Microsoft Windows to store and import registry settings. The Windows Registry is a hierarchical database that s…
NetCDF (Network Common Data Form) is a set of software libraries and self-describing, machine-independent data formats that support the creation, access, and s…
AsciiDoc is a human-readable document format that is semantically equivalent to DocBook XML, but uses a plain text markup language. It's designed for writing n…
The .drawio file format is used by draw.io (now diagrams.net), a free, open-source diagramming application. It stores diagrams, flowcharts, UML diagrams, mind…
A plain text file (.txt) is a simple, unformatted document that contains only text characters, adhering to a character encoding standard such as ASCII, UTF-8…
X3D (Extensible 3D Graphics) is an open, royalty-free ISO standard for defining 3D computer graphics. It is the successor to VRML (Virtual Reality Modeling Lan…
The ASX file format, short for Advanced Stream Redirector, is a type of XML-based metafile used by Microsoft's Windows Media Player. It essentially acts as a p…
MHTML (MIME HTML) is a web page archive format used to combine, in a single document, the HTML code and its associated resources such as images, audio, video…
The Esri Grid format is a raster data storage format used by Esri's ArcGIS software for representing geographic data. It's a fundamental format for storing spa…
Everything you need to know about file extensions