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.
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A CFG file is a configuration file used by various software programs to store settings and parameters. These files are typically plain…
VRML (Virtual Reality Modeling Language) is a standard file format for representing 3D interactive vector graphics, designed particula…
HTML (HyperText Markup Language) is the standard markup language for creating web pages. HTML5 is the latest major revision of HTML, a…
Protocol Buffers, often shortened to Protobuf, is a language-neutral, platform-neutral, extensible mechanism for serializing structure…
An INF file, short for Setup Information file, is a plain text file format used by Microsoft Windows for installing software and hardw…
A .crash file is a crash report generated by macOS and iOS operating systems when an application unexpectedly terminates or encounters…
The Intel HEX file format is a widely used ASCII text file format for conveying binary data, primarily for programming microcontroller…
A DDL (Data Definition Language) file contains commands used to define the structure of a database. These commands are part of SQL (St…
Avro is a data serialization system developed within the Apache Hadoop project. It provides a rich data structure, a compact, fast, bi…
The GPX (GPS Exchange Format) file format is an XML schema designed for transferring GPS data between applications and web services. I…
HDF5 is a versatile, open-source file format designed to store and organize large amounts of numerical data. It's particularly well-su…
ORC (Optimized Row Columnar) is a self-describing, type-aware columnar file format designed for Hadoop workloads. It is optimized for…
DWG is a proprietary binary file format used for storing two- and three-dimensional design data and metadata. It is the native format…
SequenceFile is a flat file format prevalent in Hadoop environments, designed to store sequences of binary key/value pairs. It's a cor…
A .hdmp file, also known as a Windows Heap Dump file, is a snapshot of the memory heap of a running process at a specific point in tim…
FictionBook (FB2) is an XML-based e-book format primarily designed for representing books in a structured and standardized way. Its ma…
The .numbers file extension is associated with Apple's Numbers application, a spreadsheet program that is part of the iWork suite. Num…
Protocol Buffers (protobuf) is a language-neutral, platform-neutral, extensible mechanism for serializing structured data. It's simila…
The RVT file extension is associated with Autodesk Revit, a Building Information Modeling (BIM) software used extensively in the archi…
The .s3db file extension represents a database file used by SQLite, a self-contained, serverless, zero-configuration, transactional SQ…
The Feather file format is a lightweight, columnar data format designed for fast data transfer between data analysis environments. It'…
The .stp file extension, also known as STEP (Standard for the Exchange of Product Data), represents a 3D graphic file format used for…
GRIB (GRIdded Binary) is a concise data format commonly used in meteorology to store and exchange gridded data, such as weather foreca…
An NDF file is a secondary data file used by Microsoft SQL Server. SQL Server databases are typically stored across multiple files for…
A CFG file is a configuration file used by various software programs to store settings and parameters. These files are typically plain text or binary files tha…
VRML (Virtual Reality Modeling Language) is a standard file format for representing 3D interactive vector graphics, designed particularly for the World Wide We…
HTML (HyperText Markup Language) is the standard markup language for creating web pages. HTML5 is the latest major revision of HTML, and it includes a number o…
Protocol Buffers, often shortened to Protobuf, is a language-neutral, platform-neutral, extensible mechanism for serializing structured data. It's similar to X…
An INF file, short for Setup Information file, is a plain text file format used by Microsoft Windows for installing software and hardware components. It contai…
A .crash file is a crash report generated by macOS and iOS operating systems when an application unexpectedly terminates or encounters a fatal error. These fil…
The Intel HEX file format is a widely used ASCII text file format for conveying binary data, primarily for programming microcontrollers, EPROMs, and other prog…
A DDL (Data Definition Language) file contains commands used to define the structure of a database. These commands are part of SQL (Structured Query Language)…
Avro is a data serialization system developed within the Apache Hadoop project. It provides a rich data structure, a compact, fast, binary data format, a conta…
The GPX (GPS Exchange Format) file format is an XML schema designed for transferring GPS data between applications and web services. It is an open and widely a…
HDF5 is a versatile, open-source file format designed to store and organize large amounts of numerical data. It's particularly well-suited for scientific and e…
ORC (Optimized Row Columnar) is a self-describing, type-aware columnar file format designed for Hadoop workloads. It is optimized for large-scale data processi…
DWG is a proprietary binary file format used for storing two- and three-dimensional design data and metadata. It is the native format for several CAD (Computer…
SequenceFile is a flat file format prevalent in Hadoop environments, designed to store sequences of binary key/value pairs. It's a core component of the Hadoop…
A .hdmp file, also known as a Windows Heap Dump file, is a snapshot of the memory heap of a running process at a specific point in time. It's primarily used fo…
FictionBook (FB2) is an XML-based e-book format primarily designed for representing books in a structured and standardized way. Its main goal is to preserve th…
The .numbers file extension is associated with Apple's Numbers application, a spreadsheet program that is part of the iWork suite. Numbers files store tabular…
Protocol Buffers (protobuf) is a language-neutral, platform-neutral, extensible mechanism for serializing structured data. It's similar to XML, but smaller, fa…
The RVT file extension is associated with Autodesk Revit, a Building Information Modeling (BIM) software used extensively in the architecture, engineering, and…
The .s3db file extension represents a database file used by SQLite, a self-contained, serverless, zero-configuration, transactional SQL database engine. SQLite…
The Feather file format is a lightweight, columnar data format designed for fast data transfer between data analysis environments. It's particularly well-suite…
The .stp file extension, also known as STEP (Standard for the Exchange of Product Data), represents a 3D graphic file format used for storing 3D models and ass…
GRIB (GRIdded Binary) is a concise data format commonly used in meteorology to store and exchange gridded data, such as weather forecasts and climate model out…
An NDF file is a secondary data file used by Microsoft SQL Server. SQL Server databases are typically stored across multiple files for performance and manageme…
Everything you need to know about file extensions