file-type logo

> Detect the file type of a file, stream, or data The file type is detected by checking the [magic number](https://en.wikipedia.org/wiki/Magic_number_(programming)#Magic_numbers_in_files) of the buffer. This package is for detecting binary-based file formats, not text-based formats like `.txt`, `.csv`, `.svg`, etc. We accept contributions for commonly used modern file formats, not historical or obscure ones. Open an issue first for discussion. ## Install ```sh npm install file-type ``` **This package is an ESM package. Your project needs to be ESM too. [Read more](https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c). For TypeScript + CommonJS, see [`load-esm`](https://github.com/Borewit/load-esm).** If you use it with Webpack, you need the latest Webpack version and ensure you configure it correctly for ESM. > [!IMPORTANT] > File type detection is based on binary signatures (magic numbers) and is a best-effort hint. It does not guarantee the file is actually of that type or that the file is valid/not malformed. > > Robustness against malformed input is best-effort. When processing untrusted files on a server, enforce a reasonable file size limit and use a worker thread with a timeout (e.g., [`make-asynchronous`](https://github.com/sindresorhus/make-asynchronous)). These are not considered security issues in this package. ## Usage ### Node.js Determine file type from a file: ```js import {fileTypeFromFile} from 'file-type'; console.log(await fileTypeFromFile('Unicorn.png')); //=> {ext: 'png', mime: 'image/png'} ``` Determine file type from a Uint8Array/ArrayBuffer, which may be a portion of the beginning of a file: ```js import {fileTypeFromBuffer} from 'file-type'; import {readChunk} from 'read-chunk'; const buffer = await readChunk('Unicorn.png', {length: 4100}); console.log(await fileTypeFromBuffer(buffer)); //=> {ext: 'png', mime: 'image/png'} ``` Determine file type from a stream: ```js import {fileTypeFromStream} from 'file-type'; const url = 'https://upload.wikimedia.org/wikipedia/en/a/a9/Example.jpg'; const response = await fetch(url); const fileType = await fileTypeFromStream(response.body); console.log(fileType); //=> {ext: 'jpg', mime: 'image/jpeg'} ``` ## API ### fileTypeFromBuffer(buffer, options) Detect the file type of a `Uint8Array` or `ArrayBuffer`. The file type is detected by checking the [magic number](https://en.wikipedia.org/wiki/Magic_number_(programming)#Magic_numbers_in_files) of the buffer. If file access is available, it is recommended to use `fileTypeFromFile()` instead. Returns a `Promise` for an object with the detected file type: - `ext` - One of the [supported file types](#supported-file-types) - `mime` - The [MIME type](https://en.wikipedia.org/wiki/Internet_media_type) Or `undefined` when there is no match. #### buffer Type: `Uint8Array | ArrayBuffer` A buffer representing file data. It works best if the buffer contains the entire file. It may work with a smaller portion as well. ### fileTypeFromFile(filePath, options) Detect the file type of a file path. Only available in environments where `node:fs` is available, such as Node.js. To read from a [`File`](https://developer.mozilla.org/docs/Web/API/File), see [`fileTypeFromBlob()`](#filetypefromblobblob-options). The file type is detected by checking the [magic number](https://en.wikipedia.org/wiki/Magic_number_(programming)#Magic_numbers_in_files) of the file. Returns a `Promise` for an object with the detected file type: - `ext` - One of the [supported file types](#supported-file-types) - `mime` - The [MIME type](https://en.wikipedia.org/wiki/Internet_media_type) Or `undefined` when there is no match. #### filePath Type: `string` The file path to parse. ### fileTypeFromStream(stream, options) Detect the file type of a [web `ReadableStream`](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream). The file type is detected by checking the [magic number](https://en.wikipedia.org/wiki/Magic_number_(programming)#Magic_numbers_in_files) of the buffer. Returns a `Promise` for an object with the detected file type: - `ext` - One of the [supported file types](#supported-file-types) - `mime` - The [MIME type](https://en.wikipedia.org/wiki/Internet_media_type) Or `undefined` when there is no match. #### stream Type: [Web `ReadableStream`](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream) A readable stream representing file data. > [!TIP] > If you have a Node.js `stream.Readable`, convert it with [`Readable.toWeb()`](https://nodejs.org/api/stream.html#streamreadabletowebstreamreadable-options). ### fileTypeFromBlob(blob, options) Detect the file type of a [`Blob`](https://developer.mozilla.org/docs/Web/API/Blob). > [!TIP] > A [`File` object](https://developer.mozilla.org/docs/Web/API/File) is a `Blob` and can be passed in here. It will **stream** the underlying Blob. The file type is detected by checking the [magic number](https://en.wikipedia.org/wiki/Magic_number_(programming)#Magic_numbers_in_files) of the blob. Returns a `Promise` for an object with the detected file type: - `ext` - One of the [supported file types](#supported-file-types) - `mime` - The [MIME type](https://en.wikipedia.org/wiki/Internet_media_type) Or `undefined` when there is no match. ```js import {fileTypeFromBlob} from 'file-type'; const blob = new Blob([''], { type: 'text/plain', endings: 'native' }); console.log(await fileTypeFromBlob(blob)); //=> {ext: 'txt', mime: 'text/plain'} ``` #### blob Type: [`Blob`](https://developer.mozilla.org/en-US/docs/Web/API/Blob) ### fileTypeFromTokenizer(tokenizer, options) Detect the file type from an `ITokenizer` source. This method is used internally, but can also be used for a special "tokenizer" reader. A tokenizer propagates the internal read functions, allowing alternative transport mechanisms, to access files, to be implemented and used. Returns a `Promise` for an object with the detected file type: - `ext` - One of the [supported file types](#supported-file-types) - `mime` - The [MIME type](https://en.wikipedia.org/wiki/Internet_media_type) Or `undefined` when there is no match. An example is [`@tokenizer/http`](https://github.com/Borewit/tokenizer-http), which requests data using [HTTP-range-requests](https://developer.mozilla.org/en-US/docs/Web/HTTP/Range_requests). A difference with a conventional stream and the [*tokenizer*](https://github.com/Borewit/strtok3#tokenizer), is that it can *ignore* (seek, fast-forward) in the stream. For example, you may only need and read the first 6 bytes, and the last 128 bytes, which may be an advantage in case reading the entire file would take longer. ```js import {makeTokenizer} from '@tokenizer/http'; import {fileTypeFromTokenizer} from 'file-type'; const audioTrackUrl = 'https://test-audio.netlify.com/Various%20Artists%20-%202009%20-%20netBloc%20Vol%2024_%20tiuqottigeloot%20%5BMP3-V2%5D/01%20-%20Diablo%20Swing%20Orchestra%20-%20Heroines.mp3'; const httpTokenizer = await makeTokenizer(audioTrackUrl); const fileType = await fileTypeFromTokenizer(httpTokenizer); console.log(fileType); //=> {ext: 'mp3', mime: 'audio/mpeg'} ``` Or use [`@tokenizer/s3`](https://github.com/Borewit/tokenizer-s3) to determine the file type of a file stored on [Amazon S3](https://aws.amazon.com/s3): ```js import {S3Client} from '@aws-sdk/client-s3'; import {makeChunkedTokenizerFromS3} from '@tokenizer/s3'; import {fileTypeFromTokenizer} from 'file-type'; // Initialize S3 client const s3 = new S3Client(); // Initialize the S3 tokenizer. const s3Tokenizer = await makeChunkedTokenizerFromS3(s3, { Bucket: 'affectlab', Key: '1min_35sec.mp4' }); // Figure out what kind of file it is. const fileType = await fileTypeFromTokenizer(s3Tokenizer); console.log(fileType); ``` Note that only the minimum amount of data required to determine the file type is read (okay, just a bit extra to prevent too many fragmented reads). #### tokenizer Type: [`ITokenizer`](https://github.com/Borewit/strtok3#tokenizer) A file source implementing the [tokenizer interface](https://github.com/Borewit/strtok3#tokenizer). ### fileTypeStream(webStream, options?) Returns a `Promise` which resolves to the original readable stream argument, but with an added `fileType` property, which is an object like the one returned from `fileTypeFromFile()`. This method can be handy to put in a stream pipeline, but it comes with a price. Internally `stream()` builds up a buffer of `sampleSize` bytes, used as a sample, to determine the file type. The sample size impacts the file detection resolution. A smaller sample size will result in lower probability of the best file type detection. #### webStream Type: [Web `ReadableStream`](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream) The input stream. #### options Type: `object` Supports the following options in addition to the [general options](#options): ##### sampleSize Type: `number`\ Default: `4100` The sample size in bytes. #### Example ```js import {fileTypeStream} from 'file-type'; const url = 'https://upload.wikimedia.org/wikipedia/en/a/a9/Example.jpg'; const response = await fetch(url); const stream = await fileTypeStream(response.body, {sampleSize: 1024}); if (stream.fileType?.mime === 'image/jpeg') { // stream can be used to stream the JPEG image (from the very beginning of the stream) } ``` ### supportedExtensions Returns a `Set` of supported file extensions. ### supportedMimeTypes Returns a `Set` of supported MIME types. ### Options #### customDetectors Array of custom file type detectors to run before default detectors. For example: ```js import {fileTypeFromFile} from 'file-type'; import {detectXml} from '@file-type/xml'; const fileType = await fileTypeFromFile('sample.kml', {customDetectors: [detectXml]}); console.log(fileType); ``` #### mpegOffsetTolerance Default: `0` Specifies the byte tolerance for locating the first MPEG audio frame (e.g. `.mp1`, `.mp2`, `.mp3`, `.aac`). Allows detection to handle slight sync offsets between the expected and actual frame start. Common in malformed or incorrectly muxed files, which, while technically invalid, do occur in the wild. A tolerance of 10 bytes covers most cases. ## Custom detectors Custom file type detectors are plugins designed to extend the default detection capabilities. They allow support for uncommon file types, non-binary formats, or customized detection behavior. Detectors can be added via the constructor options or by directly modifying `FileTypeParser#detectors`. Detectors provided through the constructor are executed before the default ones. ### Example adding a detector ```js import {FileTypeParser} from 'file-type'; import {detectXml} from '@file-type/xml'; const parser = new FileTypeParser({customDetectors: [detectXml]}); const fileType = await parser.fromFile('sample.kml'); console.log(fileType); ``` ### Available third-party file-type detectors - [@file-type/av](https://github.com/Borewit/file-type-av): Improves detection of audio and video file formats, with accurate differentiation between the two - [@file-type/cfbf](https://github.com/Borewit/file-type-cfbf): Detects Compound File Binary Format (CFBF) based formats, such as Office 97–2003 documents and `.msi`. - [@file-type/pdf](https://github.com/Borewit/file-type-pdf): Detects PDF based file types, such as Adobe Illustrator - [@file-type/xml](https://github.com/Borewit/file-type-xml): Detects common XML file types, such as GLM, KML, MusicXML, RSS, SVG, and XHTML ### Detector execution flow If a detector returns `undefined`, the following rules apply: 1. **No Tokenizer Interaction**: If the detector does not modify the tokenizer's position, the next detector in the sequence is executed. 2. **Tokenizer Interaction**: If the detector modifies the tokenizer's position (`tokenizer.position` is advanced), no further detectors are executed. In this case, the file type remains `undefined`, as subsequent detectors cannot evaluate the content. This is an exceptional scenario, as it prevents any other detectors from determining the file type. ### Writing your own custom detector Below is an example of a custom detector. This can be passed to the `FileTypeParser` via the `customDetectors` option. ```js import {FileTypeParser} from 'file-type'; const unicornDetector = { id: 'unicorn', // May be used to recognize the detector in the detector list async detect(tokenizer) { const unicornHeader = [85, 78, 73, 67, 79, 82, 78]; // "UNICORN" in ASCII decimal const buffer = new Uint8Array(unicornHeader.length); await tokenizer.peekBuffer(buffer, {length: unicornHeader.length, mayBeLess: true}); if (unicornHeader.every((value, index) => value === buffer[index])) { return {ext: 'unicorn', mime: 'application/unicorn'}; } return undefined; } } const buffer = new Uint8Array([85, 78, 73, 67, 79, 82, 78]); const parser = new FileTypeParser({customDetectors: [unicornDetector]}); const fileType = await parser.fromBuffer(buffer); console.log(fileType); // {ext: 'unicorn', mime: 'application/unicorn'} ``` ```ts /** @param tokenizer - The [tokenizer](https://github.com/Borewit/strtok3#tokenizer) used to read file content. @param fileType - The file type detected by standard or previous custom detectors, or `undefined` if no match is found. @returns The detected file type, or `undefined` if no match is found. */ export type Detector = { id: string; detect: (tokenizer: ITokenizer, fileType?: FileTypeResult) => Promise; }; ``` ## Abort signal Some async operations can be aborted by passing an [`AbortSignal`](https://developer.mozilla.org/en-US/docs/Web/API/AbortSignal) to the `FileTypeParser` constructor. ```js import {FileTypeParser} from 'file-type'; const abortController = new AbortController(); const parser = new FileTypeParser({signal: abortController.signal}); const promise = parser.fromStream(blob.stream()); abortController.abort(); // Abort file-type reading from the Blob stream. ``` ## Supported file types MIME media subtypes prefixed with `x-ft-` are custom and defined by us. They are neither formally registered with IANA nor based on any informal conventions. - [`3g2`](https://en.wikipedia.org/wiki/3GP_and_3G2#3G2) - Multimedia container format defined by the 3GPP2 for 3G CDMA2000 multimedia services - [`3gp`](https://en.wikipedia.org/wiki/3GP_and_3G2#3GP) - Multimedia container format defined by the Third Generation Partnership Project (3GPP) for 3G UMTS multimedia services - [`3mf`](https://en.wikipedia.org/wiki/3D_Manufacturing_Format) - 3D Manufacturing Format - [`7z`](https://en.wikipedia.org/wiki/7z) - 7-Zip archive - [`Z`](https://fileinfo.com/extension/z) - Unix Compressed File - [`aac`](https://en.wikipedia.org/wiki/Advanced_Audio_Coding) - Advanced Audio Coding - [`ac3`](https://www.atsc.org/standard/a522012-digital-audio-compression-ac-3-e-ac-3-standard-12172012/) - ATSC A/52 Audio File - [`ace`](https://en.wikipedia.org/wiki/ACE_(compressed_file_format)) - ACE archive - [`aif`](https://en.wikipedia.org/wiki/Audio_Interchange_File_Format) - Audio Interchange file - [`alias`](https://en.wikipedia.org/wiki/Alias_%28Mac_OS%29) - macOS Alias file - [`amr`](https://en.wikipedia.org/wiki/Adaptive_Multi-Rate_audio_codec) - Adaptive Multi-Rate audio codec - [`ape`](https://en.wikipedia.org/wiki/Monkey%27s_Audio) - Monkey's Audio - [`apk`](https://en.wikipedia.org/wiki/Apk_(file_format)) - Android package format - [`apng`](https://en.wikipedia.org/wiki/APNG) - Animated Portable Network Graphics - [`ar`](https://en.wikipedia.org/wiki/Ar_(Unix)) - Archive file - [`arj`](https://en.wikipedia.org/wiki/ARJ) - Archive file - [`arrow`](https://arrow.apache.org) - Columnar format for tables of data - [`arw`](https://en.wikipedia.org/wiki/Raw_image_format#ARW) - Sony Alpha Raw image file - [`asar`](https://github.com/electron/asar#format) - Archive format primarily used to enclose Electron applications - [`asf`](https://en.wikipedia.org/wiki/Advanced_Systems_Format) - Advanced Systems Format - [`avi`](https://en.wikipedia.org/wiki/Audio_Video_Interleave) - Audio Video Interleave file - [`avif`](https://en.wikipedia.org/wiki/AV1#AV1_Image_File_Format_(AVIF)) - AV1 Image File Format - [`avro`](https://en.wikipedia.org/wiki/Apache_Avro#Avro_Object_Container_File) - Object container file developed by Apache Avro - [`blend`](https://wiki.blender.org/index.php/Dev:Source/Architecture/File_Format) - Blender project - [`bmp`](https://en.wikipedia.org/wiki/BMP_file_format) - Bitmap image file - [`bpg`](https://bellard.org/bpg/) - Better Portable Graphics file - [`bz2`](https://en.wikipedia.org/wiki/Bzip2) - Archive file - [`cab`](https://en.wikipedia.org/wiki/Cabinet_(file_format)) - Cabinet file - [`cfb`](https://en.wikipedia.org/wiki/Compound_File_Binary_Format) - Compound File Binary Format - [`chm`](https://en.wikipedia.org/wiki/Microsoft_Compiled_HTML_Help) - Microsoft Compiled HTML Help - [`class`](https://en.wikipedia.org/wiki/Java_class_file) - Java class file - [`cpio`](https://en.wikipedia.org/wiki/Cpio) - Cpio archive - [`cr2`](https://fileinfo.com/extension/cr2) - Canon Raw image file (v2) - [`cr3`](https://fileinfo.com/extension/cr3) - Canon Raw image file (v3) - [`crx`](https://developer.chrome.com/extensions/crx) - Google Chrome extension - [`cur`](https://en.wikipedia.org/wiki/ICO_(file_format)) - Icon file - [`dat`](https://en.wikipedia.org/wiki/Windows_Registry) - Windows registry hive file - [`dcm`](https://en.wikipedia.org/wiki/DICOM#Data_format) - DICOM Image File - [`deb`](https://en.wikipedia.org/wiki/Deb_(file_format)) - Debian package - [`dmg`](https://en.wikipedia.org/wiki/Apple_Disk_Image) - Apple Disk Image - [`dng`](https://en.wikipedia.org/wiki/Digital_Negative) - Adobe Digital Negative image file - [`docm`](https://en.wikipedia.org/wiki/List_of_Microsoft_Office_filename_extensions) - Microsoft Word macro-enabled document - [`docx`](https://en.wikipedia.org/wiki/Office_Open_XML) - Microsoft Word document - [`dotm`](https://en.wikipedia.org/wiki/List_of_Microsoft_Office_filename_extensions) - Microsoft Word macro-enabled template - [`dotx`](https://en.wikipedia.org/wiki/List_of_Microsoft_Office_filename_extensions) - Microsoft Word template - [`drc`](https://en.wikipedia.org/wiki/Zstandard) - Google's Draco 3D Data Compression - [`dsf`](https://dsd-guide.com/sites/default/files/white-papers/DSFFileFormatSpec_E.pdf) - Sony DSD Stream File (DSF) - [`dwg`](https://en.wikipedia.org/wiki/.dwg) - Autodesk CAD file - [`elf`](https://en.wikipedia.org/wiki/Executable_and_Linkable_Format) - Unix Executable and Linkable Format - [`eot`](https://en.wikipedia.org/wiki/Embedded_OpenType) - Embedded OpenType font - [`eps`](https://en.wikipedia.org/wiki/Encapsulated_PostScript) - Encapsulated PostScript - [`epub`](https://en.wikipedia.org/wiki/EPUB) - E-book file - [`exe`](https://en.wikipedia.org/wiki/.exe) - Executable file - [`f4a`](https://en.wikipedia.org/wiki/Flash_Video) - Audio-only ISO base media file format used by Adobe Flash Player - [`f4b`](https://en.wikipedia.org/wiki/Flash_Video) - Audiobook and podcast ISO base media file format used by Adobe Flash Player - [`f4p`](https://en.wikipedia.org/wiki/Flash_Video) - ISO base media file format protected by Adobe Access DRM used by Adobe Flash Player - [`f4v`](https://en.wikipedia.org/wiki/Flash_Video) - ISO base media file format used by Adobe Flash Player - [`fbx`](https://en.wikipedia.org/wiki/FBX) - Filmbox is a proprietary file format used to provide interoperability between digital content creation apps. - [`flac`](https://en.wikipedia.org/wiki/FLAC) - Free Lossless Audio Codec - [`flif`](https://en.wikipedia.org/wiki/Free_Lossless_Image_Format) - Free Lossless Image Format - [`flv`](https://en.wikipedia.org/wiki/Flash_Video) - Flash video - [`gif`](https://en.wikipedia.org/wiki/GIF) - Graphics Interchange Format - [`glb`](https://github.com/KhronosGroup/glTF) - GL Transmission Format - [`gz`](https://en.wikipedia.org/wiki/Gzip) - Archive file - [`heic`](https://nokiatech.github.io/heif/technical.html) - High Efficiency Image File Format - [`icc`](https://en.wikipedia.org/wiki/ICC_profile) - ICC Profile - [`icns`](https://en.wikipedia.org/wiki/Apple_Icon_Image_format) - Apple Icon image - [`ico`](https://en.wikipedia.org/wiki/ICO_(file_format)) - Windows icon file - [`ics`](https://en.wikipedia.org/wiki/ICalendar#Data_format) - iCalendar - [`indd`](https://en.wikipedia.org/wiki/Adobe_InDesign#File_format) - Adobe InDesign document - [`it`](https://wiki.openmpt.org/Manual:_Module_formats#The_Impulse_Tracker_format_.28.it.29) - Audio module format: Impulse Tracker - [`j2c`](https://en.wikipedia.org/wiki/JPEG_2000) - JPEG 2000 - [`jar`](https://en.wikipedia.org/wiki/JAR_(file_format)) - Java archive - [`jls`](https://en.wikipedia.org/wiki/Lossless_JPEG#JPEG-LS) - Lossless/near-lossless compression standard for continuous-tone images - [`jmp`](https://en.wikipedia.org/wiki/JMP_(statistical_software)) - JMP data file format by SAS Institute - [`jp2`](https://en.wikipedia.org/wiki/JPEG_2000) - JPEG 2000 - [`jpg`](https://en.wikipedia.org/wiki/JPEG) - Joint Photographic Experts Group image - [`jpm`](https://en.wikipedia.org/wiki/JPEG_2000) - JPEG 2000 - [`jpx`](https://en.wikipedia.org/wiki/JPEG_2000) - JPEG 2000 - [`jxl`](https://en.wikipedia.org/wiki/JPEG_XL) - JPEG XL image format - [`jxr`](https://en.wikipedia.org/wiki/JPEG_XR) - Joint Photographic Experts Group extended range - [`key`](https://en.wikipedia.org/wiki/Keynote_(presentation_software)) - Apple Keynote presentation - [`ktx`](https://www.khronos.org/opengles/sdk/tools/KTX/file_format_spec/) - OpenGL and OpenGL ES textures - [`lnk`](https://en.wikipedia.org/wiki/Shortcut_%28computing%29#Microsoft_Windows) - Microsoft Windows file shortcut - [`lz`](https://en.wikipedia.org/wiki/Lzip) - Archive file - [`lz4`](https://en.wikipedia.org/wiki/LZ4_(compression_algorithm)) - Compressed archive created by one of a variety of LZ4 compression utilities - [`lzh`](https://en.wikipedia.org/wiki/LHA_(file_format)) - LZH archive - [`m4a`](https://en.wikipedia.org/wiki/M4A) - Audio-only MPEG-4 files - [`m4b`](https://en.wikipedia.org/wiki/M4B) - Audiobook and podcast MPEG-4 files, which also contain metadata including chapter markers, images, and hyperlinks - [`m4p`](https://en.wikipedia.org/wiki/MPEG-4_Part_14#Filename_extensions) - MPEG-4 files with audio streams encrypted by FairPlay Digital Rights Management as were sold through the iTunes Store - [`m4v`](https://en.wikipedia.org/wiki/M4V) - Video container format developed by Apple, which is very similar to the MP4 format - [`macho`](https://en.wikipedia.org/wiki/Mach-O) - Mach-O binary format - [`mid`](https://en.wikipedia.org/wiki/MIDI) - Musical Instrument Digital Interface file - [`mie`](https://en.wikipedia.org/wiki/Sidecar_file) - Dedicated meta information format which supports storage of binary as well as textual meta information - [`mj2`](https://en.wikipedia.org/wiki/Motion_JPEG_2000) - Motion JPEG 2000 - [`mkv`](https://en.wikipedia.org/wiki/Matroska) - Matroska video file - [`mobi`](https://en.wikipedia.org/wiki/Mobipocket) - Mobipocket - [`mov`](https://en.wikipedia.org/wiki/QuickTime_File_Format) - QuickTime video file - [`mp1`](https://en.wikipedia.org/wiki/MPEG-1_Audio_Layer_I) - MPEG-1 Audio Layer I - [`mp2`](https://en.wikipedia.org/wiki/MPEG-1_Audio_Layer_II) - MPEG-1 Audio Layer II - [`mp3`](https://en.wikipedia.org/wiki/MP3) - Audio file - [`mp4`](https://en.wikipedia.org/wiki/MPEG-4_Part_14#Filename_extensions) - MPEG-4 Part 14 video file - [`mpc`](https://en.wikipedia.org/wiki/Musepack) - Musepack (SV7 & SV8) - [`mpg`](https://en.wikipedia.org/wiki/MPEG-1) - MPEG-1 file - [`mts`](https://en.wikipedia.org/wiki/.m2ts) - MPEG-2 Transport Stream, both raw and Blu-ray Disc Audio-Video (BDAV) versions - [`mxf`](https://en.wikipedia.org/wiki/Material_Exchange_Format) - Material Exchange Format - [`nef`](https://www.nikonusa.com/en/learn-and-explore/a/products-and-innovation/nikon-electronic-format-nef.html) - Nikon Electronic Format image file - [`nes`](https://fileinfo.com/extension/nes) - Nintendo NES ROM - [`numbers`](https://en.wikipedia.org/wiki/Numbers_(spreadsheet)) - Apple Numbers spreadsheet - [`odg`](https://en.wikipedia.org/wiki/OpenDocument) - OpenDocument for drawing - [`odp`](https://en.wikipedia.org/wiki/OpenDocument) - OpenDocument for presentations - [`ods`](https://en.wikipedia.org/wiki/OpenDocument) - OpenDocument for spreadsheets - [`odt`](https://en.wikipedia.org/wiki/OpenDocument) - OpenDocument for word processing - [`oga`](https://en.wikipedia.org/wiki/Ogg) - Audio file - [`ogg`](https://en.wikipedia.org/wiki/Ogg) - Audio file - [`ogm`](https://en.wikipedia.org/wiki/Ogg) - Audio file - [`ogv`](https://en.wikipedia.org/wiki/Ogg) - Audio file - [`ogx`](https://en.wikipedia.org/wiki/Ogg) - Audio file - [`opus`](https://en.wikipedia.org/wiki/Opus_(audio_format)) - Audio file - [`orf`](https://en.wikipedia.org/wiki/ORF_format) - Olympus Raw image file - [`otf`](https://en.wikipedia.org/wiki/OpenType) - OpenType font - [`otg`](https://en.wikipedia.org/wiki/OpenDocument_technical_specification#Templates) - OpenDocument template for drawing - [`otp`](https://en.wikipedia.org/wiki/OpenDocument_technical_specification#Templates) - OpenDocument template for presentations - [`ots`](https://en.wikipedia.org/wiki/OpenDocument_technical_specification#Templates) - OpenDocument template for spreadsheets - [`ott`](https://en.wikipedia.org/wiki/OpenDocument_technical_specification#Templates) - OpenDocument template for word processing - [`pages`](https://en.wikipedia.org/wiki/Pages_(word_processor)) - Apple Pages document - [`parquet`](https://en.wikipedia.org/wiki/Apache_Parquet) - Apache Parquet - [`pcap`](https://wiki.wireshark.org/Development/LibpcapFileFormat) - Libpcap File Format - [`pdf`](https://en.wikipedia.org/wiki/Portable_Document_Format) - Portable Document Format - [`pgp`](https://en.wikipedia.org/wiki/Pretty_Good_Privacy) - Pretty Good Privacy - [`png`](https://en.wikipedia.org/wiki/Portable_Network_Graphics) - Portable Network Graphics - [`potm`](https://en.wikipedia.org/wiki/List_of_Microsoft_Office_filename_extensions) - Microsoft PowerPoint macro-enabled template - [`potx`](https://en.wikipedia.org/wiki/List_of_Microsoft_Office_filename_extensions) - Microsoft PowerPoint template - [`ppsm`](https://en.wikipedia.org/wiki/List_of_Microsoft_Office_filename_extensions#PowerPoint) - Office PowerPoint 2007 macro-enabled slide show - [`ppsx`](https://en.wikipedia.org/wiki/List_of_Microsoft_Office_filename_extensions#PowerPoint) - Office PowerPoint 2007 slide show - [`pptm`](https://en.wikipedia.org/wiki/List_of_Microsoft_Office_filename_extensions) - Microsoft PowerPoint macro-enabled document - [`pptx`](https://en.wikipedia.org/wiki/Office_Open_XML) - Microsoft PowerPoint document - [`ps`](https://en.wikipedia.org/wiki/Postscript) - PostScript - [`psd`](https://en.wikipedia.org/wiki/Adobe_Photoshop#File_format) - Adobe Photoshop document - [`pst`](https://en.wikipedia.org/wiki/Personal_Storage_Table) - Personal Storage Table file - [`qcp`](https://en.wikipedia.org/wiki/QCP) - Tagged and chunked data - [`raf`](https://en.wikipedia.org/wiki/Raw_image_format) - Fujifilm RAW image file - [`rar`](https://en.wikipedia.org/wiki/RAR_(file_format)) - Archive file - [`reg`](https://en.wikipedia.org/wiki/Windows_Registry) - Windows registry (entries) file format - [`rm`](https://en.wikipedia.org/wiki/RealMedia) - RealMedia - [`rpm`](https://fileinfo.com/extension/rpm) - Red Hat Package Manager file - [`rtf`](https://en.wikipedia.org/wiki/Rich_Text_Format) - Rich Text Format - [`rw2`](https://en.wikipedia.org/wiki/Raw_image_format) - Panasonic RAW image file - [`s3m`](https://wiki.openmpt.org/Manual:_Module_formats#The_ScreamTracker_3_format_.28.s3m.29) - Audio module format: ScreamTracker 3 - [`sav`](https://en.wikipedia.org/wiki/SPSS) - SPSS Statistical Data File - [`shp`](https://en.wikipedia.org/wiki/Shapefile) - Geospatial vector data format - [`skp`](https://en.wikipedia.org/wiki/SketchUp) - SketchUp - [`spx`](https://en.wikipedia.org/wiki/Ogg) - Audio file - [`sqlite`](https://www.sqlite.org/fileformat2.html) - SQLite file - [`stl`](https://en.wikipedia.org/wiki/STL_(file_format)) - Standard Tessellated Geometry File Format (ASCII only) - [`swf`](https://en.wikipedia.org/wiki/SWF) - Adobe Flash Player file - [`tar`](https://en.wikipedia.org/wiki/Tar_(computing)#File_format) - Tape archive or tarball - [`tar.gz`](https://en.wikipedia.org/wiki/Gzip) - Gzipped tape archive (tarball) - [`tif`](https://en.wikipedia.org/wiki/Tagged_Image_File_Format) - Tagged Image file - [`ttc`](https://en.wikipedia.org/wiki/TrueType#TrueType_Collection) - TrueType Collection font - [`ttf`](https://en.wikipedia.org/wiki/TrueType) - TrueType font - [`vcf`](https://en.wikipedia.org/wiki/VCard) - vCard - [`voc`](https://wiki.multimedia.cx/index.php/Creative_Voice) - Creative Voice File - [`vsdx`](https://en.wikipedia.org/wiki/Microsoft_Visio) - Microsoft Visio File - [`vtt`](https://en.wikipedia.org/wiki/WebVTT) - WebVTT File (for video captions) - [`wasm`](https://en.wikipedia.org/wiki/WebAssembly) - WebAssembly intermediate compiled format - [`wav`](https://en.wikipedia.org/wiki/WAV) - Waveform Audio file - [`webm`](https://en.wikipedia.org/wiki/WebM) - Web video file - [`webp`](https://en.wikipedia.org/wiki/WebP) - Web Picture format - [`woff`](https://en.wikipedia.org/wiki/Web_Open_Font_Format) - Web Open Font Format - [`woff2`](https://en.wikipedia.org/wiki/Web_Open_Font_Format) - Web Open Font Format - [`wv`](https://en.wikipedia.org/wiki/WavPack) - WavPack - [`xcf`](https://en.wikipedia.org/wiki/XCF_(file_format)) - eXperimental Computing Facility - [`xlsm`](https://en.wikipedia.org/wiki/List_of_Microsoft_Office_filename_extensions) - Microsoft Excel macro-enabled document - [`xlsx`](https://en.wikipedia.org/wiki/Office_Open_XML) - Microsoft Excel document - [`xltm`](https://en.wikipedia.org/wiki/List_of_Microsoft_Office_filename_extensions) - Microsoft Excel macro-enabled template - [`xltx`](https://en.wikipedia.org/wiki/List_of_Microsoft_Office_filename_extensions) - Microsoft Excel template - [`xm`](https://wiki.openmpt.org/Manual:_Module_formats#The_FastTracker_2_format_.28.xm.29) - Audio module format: FastTracker 2 - [`xml`](https://en.wikipedia.org/wiki/XML) - eXtensible Markup Language - [`xpi`](https://en.wikipedia.org/wiki/XPInstall) - XPInstall file - [`xz`](https://en.wikipedia.org/wiki/Xz) - Compressed file - [`zip`](https://en.wikipedia.org/wiki/Zip_(file_format)) - Archive file - [`zst`](https://en.wikipedia.org/wiki/Zstandard) - Archive file *[Pull requests](.github/pull_request_template.md) are welcome for additional commonly used file types.* The following file types will not be accepted, but most of them are supported by [third-party detectors](#available-third-party-file-type-detectors). - [MS-CFB: Microsoft Compound File Binary File Format based formats](https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-cfb/53989ce4-7b05-4f8d-829b-d08d6148375b) - `.doc` - Microsoft Word 97-2003 Document - `.xls` - Microsoft Excel 97-2003 Document - `.ppt` - Microsoft PowerPoint 97-2003 Document - `.msi` - Microsoft Windows Installer - `.csv` - [Reason.](https://github.com/sindresorhus/file-type/issues/264#issuecomment-568439196) - `.svg` ## Related - [file-type-cli](https://github.com/sindresorhus/file-type-cli) - CLI for this module - [image-dimensions](https://github.com/sindresorhus/image-dimensions) - Get the dimensions of an image ## Maintainers - [Sindre Sorhus](https://github.com/sindresorhus) - [Borewit](https://github.com/Borewit)