--- title: UTType framework: uniformtypeidentifiers role: symbol role_heading: Structure path: uniformtypeidentifiers/uttype-swift.struct --- # UTType A structure that represents a type of data to load, send, or receive. ## Declaration ```swift struct UTType ``` ## Overview Overview The UTType instance may represent files on disk, abstract data types with no on-disk representation, or entirely unrelated hierarchical classification systems, such as hardware. Each instance has a unique identifier, and helpful properties, such as preferredFilenameExtension and preferredMIMEType. note: The system includes static declarations for many common types, which you can look up by identifier, filename extension, or MIME type. A UTType instance may provide additional information related to the type. For example, it may include a localized user-facing description, a reference URL to technical documentation about the type, or its version number. You can look up types by their conformance to get either a type or a list of types that are relevant to your use case. To define your own types in your app’s Info.plist, see Defining file and data types for your app. ## Topics ### Looking up a type - [types(tag:tagClass:conformingTo:)](uniformtypeidentifiers/uttype-swift.struct/types(tag:tagclass:conformingto:).md) ### Creating a type - [init(_:)](uniformtypeidentifiers/uttype-swift.struct/init(_:).md) - [init(mimeType:conformingTo:)](uniformtypeidentifiers/uttype-swift.struct/init(mimetype:conformingto:).md) - [init(filenameExtension:conformingTo:)](uniformtypeidentifiers/uttype-swift.struct/init(filenameextension:conformingto:).md) - [init(tag:tagClass:conformingTo:)](uniformtypeidentifiers/uttype-swift.struct/init(tag:tagclass:conformingto:).md) - [init(exportedAs:conformingTo:)](uniformtypeidentifiers/uttype-swift.struct/init(exportedas:conformingto:).md) - [init(importedAs:conformingTo:)](uniformtypeidentifiers/uttype-swift.struct/init(importedas:conformingto:).md) ### Identifying a type - [UTType.ReferenceType](uniformtypeidentifiers/uttype-swift.struct/referencetype.md) - [identifier](uniformtypeidentifiers/uttype-swift.struct/identifier.md) ### Obtaining tags - [preferredFilenameExtension](uniformtypeidentifiers/uttype-swift.struct/preferredfilenameextension.md) - [preferredMIMEType](uniformtypeidentifiers/uttype-swift.struct/preferredmimetype.md) - [tags](uniformtypeidentifiers/uttype-swift.struct/tags.md) ### Obtaining additional type information - [isDeclared](uniformtypeidentifiers/uttype-swift.struct/isdeclared.md) - [isDynamic](uniformtypeidentifiers/uttype-swift.struct/isdynamic.md) - [isPublic](uniformtypeidentifiers/uttype-swift.struct/ispublic.md) - [referenceURL](uniformtypeidentifiers/uttype-swift.struct/referenceurl.md) - [version](uniformtypeidentifiers/uttype-swift.struct/version.md) ### Checking a type’s relationship to another type - [supertypes](uniformtypeidentifiers/uttype-swift.struct/supertypes.md) - [conforms(to:)](uniformtypeidentifiers/uttype-swift.struct/conforms(to:).md) - [isSubtype(of:)](uniformtypeidentifiers/uttype-swift.struct/issubtype(of:).md) - [isSupertype(of:)](uniformtypeidentifiers/uttype-swift.struct/issupertype(of:).md) - [Navigating Hierarchical Data Using Outline and Split Views](appkit/navigating-hierarchical-data-using-outline-and-split-views.md) ### Describing a type - [localizedDescription](uniformtypeidentifiers/uttype-swift.struct/localizeddescription.md) ### 3D content - [threeDContent](uniformtypeidentifiers/uttype-swift.struct/threedcontent.md) - [usd](uniformtypeidentifiers/uttype-swift.struct/usd.md) - [usdz](uniformtypeidentifiers/uttype-swift.struct/usdz.md) ### Apple 3D content - [realityFile](uniformtypeidentifiers/uttype-swift.struct/realityfile.md) - [sceneKitScene](uniformtypeidentifiers/uttype-swift.struct/scenekitscene.md) - [arReferenceObject](uniformtypeidentifiers/uttype-swift.struct/arreferenceobject.md) ### Apple file system objects - [directory](uniformtypeidentifiers/uttype-swift.struct/directory.md) - [symbolicLink](uniformtypeidentifiers/uttype-swift.struct/symboliclink.md) - [mountPoint](uniformtypeidentifiers/uttype-swift.struct/mountpoint.md) - [aliasFile](uniformtypeidentifiers/uttype-swift.struct/aliasfile.md) - [folder](uniformtypeidentifiers/uttype-swift.struct/folder.md) - [volume](uniformtypeidentifiers/uttype-swift.struct/volume.md) - [diskImage](uniformtypeidentifiers/uttype-swift.struct/diskimage.md) ### Apple image formats - [heic](uniformtypeidentifiers/uttype-swift.struct/heic.md) - [heif](uniformtypeidentifiers/uttype-swift.struct/heif.md) - [livePhoto](uniformtypeidentifiers/uttype-swift.struct/livephoto.md) ### Apple system types - [framework](uniformtypeidentifiers/uttype-swift.struct/framework.md) - [applicationBundle](uniformtypeidentifiers/uttype-swift.struct/applicationbundle.md) - [applicationExtension](uniformtypeidentifiers/uttype-swift.struct/applicationextension.md) - [spotlightImporter](uniformtypeidentifiers/uttype-swift.struct/spotlightimporter.md) - [quickLookGenerator](uniformtypeidentifiers/uttype-swift.struct/quicklookgenerator.md) - [xpcService](uniformtypeidentifiers/uttype-swift.struct/xpcservice.md) - [systemPreferencesPane](uniformtypeidentifiers/uttype-swift.struct/systempreferencespane.md) ### Application files - [pdf](uniformtypeidentifiers/uttype-swift.struct/pdf.md) - [rtfd](uniformtypeidentifiers/uttype-swift.struct/rtfd.md) - [flatRTFD](uniformtypeidentifiers/uttype-swift.struct/flatrtfd.md) - [epub](uniformtypeidentifiers/uttype-swift.struct/epub.md) ### Audio - [mp3](uniformtypeidentifiers/uttype-swift.struct/mp3.md) - [aiff](uniformtypeidentifiers/uttype-swift.struct/aiff.md) - [wav](uniformtypeidentifiers/uttype-swift.struct/wav.md) - [midi](uniformtypeidentifiers/uttype-swift.struct/midi.md) - [playlist](uniformtypeidentifiers/uttype-swift.struct/playlist.md) - [m3uPlaylist](uniformtypeidentifiers/uttype-swift.struct/m3uplaylist.md) ### Audio and video - [quickTimeMovie](uniformtypeidentifiers/uttype-swift.struct/quicktimemovie.md) - [mpeg](uniformtypeidentifiers/uttype-swift.struct/mpeg.md) - [mpeg2Video](uniformtypeidentifiers/uttype-swift.struct/mpeg2video.md) - [mpeg2TransportStream](uniformtypeidentifiers/uttype-swift.struct/mpeg2transportstream.md) - [mpeg4Movie](uniformtypeidentifiers/uttype-swift.struct/mpeg4movie.md) - [mpeg4Audio](uniformtypeidentifiers/uttype-swift.struct/mpeg4audio.md) - [appleProtectedMPEG4Video](uniformtypeidentifiers/uttype-swift.struct/appleprotectedmpeg4video.md) - [appleProtectedMPEG4Audio](uniformtypeidentifiers/uttype-swift.struct/appleprotectedmpeg4audio.md) - [avi](uniformtypeidentifiers/uttype-swift.struct/avi.md) ### Compiled programming language sources - [assemblyLanguageSource](uniformtypeidentifiers/uttype-swift.struct/assemblylanguagesource.md) - [cHeader](uniformtypeidentifiers/uttype-swift.struct/cheader.md) - [cSource](uniformtypeidentifiers/uttype-swift.struct/csource.md) - [cPlusPlusHeader](uniformtypeidentifiers/uttype-swift.struct/cplusplusheader.md) - [cPlusPlusSource](uniformtypeidentifiers/uttype-swift.struct/cplusplussource.md) - [objectiveCPlusPlusSource](uniformtypeidentifiers/uttype-swift.struct/objectivecplusplussource.md) - [objectiveCSource](uniformtypeidentifiers/uttype-swift.struct/objectivecsource.md) - [swiftSource](uniformtypeidentifiers/uttype-swift.struct/swiftsource.md) ### Compressed archives - [archive](uniformtypeidentifiers/uttype-swift.struct/archive.md) - [zip](uniformtypeidentifiers/uttype-swift.struct/zip.md) - [gzip](uniformtypeidentifiers/uttype-swift.struct/gzip.md) - [bz2](uniformtypeidentifiers/uttype-swift.struct/bz2.md) - [appleArchive](uniformtypeidentifiers/uttype-swift.struct/applearchive.md) ### Cryptographic files - [pkcs12](uniformtypeidentifiers/uttype-swift.struct/pkcs12.md) - [x509Certificate](uniformtypeidentifiers/uttype-swift.struct/x509certificate.md) ### Data interchange formats - [delimitedText](uniformtypeidentifiers/uttype-swift.struct/delimitedtext.md) - [commaSeparatedText](uniformtypeidentifiers/uttype-swift.struct/commaseparatedtext.md) - [tabSeparatedText](uniformtypeidentifiers/uttype-swift.struct/tabseparatedtext.md) - [utf8TabSeparatedText](uniformtypeidentifiers/uttype-swift.struct/utf8tabseparatedtext.md) - [rtf](uniformtypeidentifiers/uttype-swift.struct/rtf.md) - [xml](uniformtypeidentifiers/uttype-swift.struct/xml.md) - [yaml](uniformtypeidentifiers/uttype-swift.struct/yaml.md) - [json](uniformtypeidentifiers/uttype-swift.struct/json.md) - [vCard](uniformtypeidentifiers/uttype-swift.struct/vcard.md) ### Executables - [executable](uniformtypeidentifiers/uttype-swift.struct/executable.md) - [unixExecutable](uniformtypeidentifiers/uttype-swift.struct/unixexecutable.md) - [exe](uniformtypeidentifiers/uttype-swift.struct/exe.md) ### Icon images - [ico](uniformtypeidentifiers/uttype-swift.struct/ico.md) - [icns](uniformtypeidentifiers/uttype-swift.struct/icns.md) ### Images - [png](uniformtypeidentifiers/uttype-swift.struct/png.md) - [gif](uniformtypeidentifiers/uttype-swift.struct/gif.md) - [jpeg](uniformtypeidentifiers/uttype-swift.struct/jpeg.md) - [webP](uniformtypeidentifiers/uttype-swift.struct/webp.md) - [tiff](uniformtypeidentifiers/uttype-swift.struct/tiff.md) - [bmp](uniformtypeidentifiers/uttype-swift.struct/bmp.md) - [svg](uniformtypeidentifiers/uttype-swift.struct/svg.md) - [rawImage](uniformtypeidentifiers/uttype-swift.struct/rawimage.md) ### Internet-specific - [html](uniformtypeidentifiers/uttype-swift.struct/html.md) - [webArchive](uniformtypeidentifiers/uttype-swift.struct/webarchive.md) - [internetLocation](uniformtypeidentifiers/uttype-swift.struct/internetlocation.md) - [internetShortcut](uniformtypeidentifiers/uttype-swift.struct/internetshortcut.md) ### Property lists - [propertyList](uniformtypeidentifiers/uttype-swift.struct/propertylist.md) - [xmlPropertyList](uniformtypeidentifiers/uttype-swift.struct/xmlpropertylist.md) - [binaryPropertyList](uniformtypeidentifiers/uttype-swift.struct/binarypropertylist.md) ### Shazam - [shazamSignature](uniformtypeidentifiers/uttype-swift.struct/shazamsignature.md) - [shazamCustomCatalog](uniformtypeidentifiers/uttype-swift.struct/shazamcustomcatalog.md) ### Scripted programming language sources - [script](uniformtypeidentifiers/uttype-swift.struct/script.md) - [appleScript](uniformtypeidentifiers/uttype-swift.struct/applescript.md) - [javaScript](uniformtypeidentifiers/uttype-swift.struct/javascript.md) - [osaScript](uniformtypeidentifiers/uttype-swift.struct/osascript.md) - [osaScriptBundle](uniformtypeidentifiers/uttype-swift.struct/osascriptbundle.md) - [makefile](uniformtypeidentifiers/uttype-swift.struct/makefile.md) - [shellScript](uniformtypeidentifiers/uttype-swift.struct/shellscript.md) - [pythonScript](uniformtypeidentifiers/uttype-swift.struct/pythonscript.md) - [rubyScript](uniformtypeidentifiers/uttype-swift.struct/rubyscript.md) - [perlScript](uniformtypeidentifiers/uttype-swift.struct/perlscript.md) - [phpScript](uniformtypeidentifiers/uttype-swift.struct/phpscript.md) ### Text files - [text](uniformtypeidentifiers/uttype-swift.struct/text.md) - [plainText](uniformtypeidentifiers/uttype-swift.struct/plaintext.md) - [utf8PlainText](uniformtypeidentifiers/uttype-swift.struct/utf8plaintext.md) - [utf16PlainText](uniformtypeidentifiers/uttype-swift.struct/utf16plaintext.md) - [utf16ExternalPlainText](uniformtypeidentifiers/uttype-swift.struct/utf16externalplaintext.md) ### URLs - [url](uniformtypeidentifiers/uttype-swift.struct/url.md) - [fileURL](uniformtypeidentifiers/uttype-swift.struct/fileurl.md) - [urlBookmarkData](uniformtypeidentifiers/uttype-swift.struct/urlbookmarkdata.md) ### Apple system base types - [item](uniformtypeidentifiers/uttype-swift.struct/item.md) - [content](uniformtypeidentifiers/uttype-swift.struct/content.md) - [compositeContent](uniformtypeidentifiers/uttype-swift.struct/compositecontent.md) - [data](uniformtypeidentifiers/uttype-swift.struct/data.md) - [resolvable](uniformtypeidentifiers/uttype-swift.struct/resolvable.md) - [package](uniformtypeidentifiers/uttype-swift.struct/package.md) - [bundle](uniformtypeidentifiers/uttype-swift.struct/bundle.md) - [pluginBundle](uniformtypeidentifiers/uttype-swift.struct/pluginbundle.md) - [application](uniformtypeidentifiers/uttype-swift.struct/application.md) - [sourceCode](uniformtypeidentifiers/uttype-swift.struct/sourcecode.md) - [bookmark](uniformtypeidentifiers/uttype-swift.struct/bookmark.md) - [log](uniformtypeidentifiers/uttype-swift.struct/log.md) ### Application base types - [spreadsheet](uniformtypeidentifiers/uttype-swift.struct/spreadsheet.md) - [presentation](uniformtypeidentifiers/uttype-swift.struct/presentation.md) - [database](uniformtypeidentifiers/uttype-swift.struct/database.md) - [message](uniformtypeidentifiers/uttype-swift.struct/message.md) - [contact](uniformtypeidentifiers/uttype-swift.struct/contact.md) - [calendarEvent](uniformtypeidentifiers/uttype-swift.struct/calendarevent.md) - [toDoItem](uniformtypeidentifiers/uttype-swift.struct/todoitem.md) - [emailMessage](uniformtypeidentifiers/uttype-swift.struct/emailmessage.md) - [font](uniformtypeidentifiers/uttype-swift.struct/font.md) ### Image, audio, and video base types - [image](uniformtypeidentifiers/uttype-swift.struct/image.md) - [audio](uniformtypeidentifiers/uttype-swift.struct/audio.md) - [audiovisualContent](uniformtypeidentifiers/uttype-swift.struct/audiovisualcontent.md) - [movie](uniformtypeidentifiers/uttype-swift.struct/movie.md) - [video](uniformtypeidentifiers/uttype-swift.struct/video.md) ### Initializers - [init(identifier:allowUndeclared:)](uniformtypeidentifiers/uttype-swift.struct/init(identifier:allowundeclared:).md) ### Type Properties - [ahap](uniformtypeidentifiers/uttype-swift.struct/ahap.md) - [css](uniformtypeidentifiers/uttype-swift.struct/css.md) - [dng](uniformtypeidentifiers/uttype-swift.struct/dng.md) - [exr](uniformtypeidentifiers/uttype-swift.struct/exr.md) - [geoJSON](uniformtypeidentifiers/uttype-swift.struct/geojson.md) - [heics](uniformtypeidentifiers/uttype-swift.struct/heics.md) - [jpegxl](uniformtypeidentifiers/uttype-swift.struct/jpegxl.md) - [linkPresentationMetadata](uniformtypeidentifiers/uttype-swift.struct/linkpresentationmetadata.md) - [markdown](uniformtypeidentifiers/uttype-swift.struct/markdown.md) - [paperkit](uniformtypeidentifiers/uttype-swift.struct/paperkit.md) - [tarArchive](uniformtypeidentifiers/uttype-swift.struct/tararchive.md) ### Default Implementations - [ReferenceConvertible Implementations](uniformtypeidentifiers/uttype-swift.struct/referenceconvertible-implementations.md) ## Relationships ### Conforms To - [Copyable](swift/copyable.md) - [CustomDebugStringConvertible](swift/customdebugstringconvertible.md) - [CustomStringConvertible](swift/customstringconvertible.md) - [Decodable](swift/decodable.md) - [Encodable](swift/encodable.md) - [Equatable](swift/equatable.md) - [Escapable](swift/escapable.md) - [Hashable](swift/hashable.md) - [ReferenceConvertible](foundation/referenceconvertible.md) - [Sendable](swift/sendable.md) - [SendableMetatype](swift/sendablemetatype.md) ## See Also ### Uniform type identifiers - [UTTagClass](uniformtypeidentifiers/uttagclass.md) - [UTTypeReference](uniformtypeidentifiers/uttypereference.md)