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
The OSGB file format is a binary representation of a 3D scene graph used primarily by the OpenSceneGraph (OSG) library, which is an op…
The OSGT file format is a text-based representation of a 3D scene graph used by the OpenSceneGraph (OSG) library. OpenSceneGraph is an…
The OSM file format is a data format used by OpenStreetMap (OSM), a collaborative project to create a free editable map of the world…
An .osu file is a plain text document used by the rhythm game 'osu!' to define the structure and gameplay elements of a specific song…
The OTF (OpenType Font) file format is a widely used standard for digital fonts, developed jointly by Microsoft and Adobe. It's an ext…
Open Timeline I/O (OTIO) is an open-source ecosystem designed to facilitate the interchange of editorial timeline information between…
The OTP file extension stands for OpenDocument Presentation Template. It is an XML-based file format used for creating presentation te…
An OTS file is a spreadsheet template created using the OpenDocument standard, which is an open, XML-based file format for office appl…
An Open Virtual Appliance (OVA) file is a package that contains files used to describe a virtual machine. It is based on the Open Virt…
The Open Virtualization Format (OVF) is an open standard for packaging and distributing virtual appliances or software to be run in vi…
An OWL file is a semantic web document written in the Web Ontology Language (OWL), a schema markup language designed for defining and…
The OSGB file format is a binary representation of a 3D scene graph used primarily by the OpenSceneGraph (OSG) library, which is an open-source, high-performan…
The OSGT file format is a text-based representation of a 3D scene graph used by the OpenSceneGraph (OSG) library. OpenSceneGraph is an open-source, high-perfor…
The OSM file format is a data format used by OpenStreetMap (OSM), a collaborative project to create a free editable map of the world. OSM files store geographi…
An .osu file is a plain text document used by the rhythm game 'osu!' to define the structure and gameplay elements of a specific song, known as a beatmap. Thes…
The OTF (OpenType Font) file format is a widely used standard for digital fonts, developed jointly by Microsoft and Adobe. It's an extension of the TrueType fo…
Open Timeline I/O (OTIO) is an open-source ecosystem designed to facilitate the interchange of editorial timeline information between different software applic…
The OTP file extension stands for OpenDocument Presentation Template. It is an XML-based file format used for creating presentation templates that serve as a b…
An OTS file is a spreadsheet template created using the OpenDocument standard, which is an open, XML-based file format for office applications. This specific e…
An Open Virtual Appliance (OVA) file is a package that contains files used to describe a virtual machine. It is based on the Open Virtualization Format (OVF) s…
The Open Virtualization Format (OVF) is an open standard for packaging and distributing virtual appliances or software to be run in virtual machines. Developed…
An OWL file is a semantic web document written in the Web Ontology Language (OWL), a schema markup language designed for defining and sharing ontologies on the…
Everything you need to know about file extensions