A MIME type (also called media type or content type) is a string that identifies the format of a file or data. For example, text/html for HTML files, image/png for PNG images. Defined in RFC 2045 and registered with IANA.

What is magic bytes detection?

Magic bytes (or file signatures) are specific byte sequences at the start of a file that identify its format. For example, PNG files always start with 0x89504E47, PDFs with 0x25504446 (%PDF). Our tool checks the first few bytes of a file against ~20 known magic byte patterns to detect the type — more reliable than extension alone.

Why are some extensions mapped to multiple MIME types?

Some file formats have multiple MIME types for historical reasons. For example, .js can be application/javascript (standard), text/javascript (legacy), or application/ecmascript. Our 'conflict finder' feature shows all extensions claimed by multiple types, and the 'analyze extension' feature shows which types claim a specific extension.

What extra features does this tool have compared to others?

Beyond standard lookup, we ship: (1) View history (localStorage, last 30). (2) Favorites — star types you reference often. (3) Category stats — see distribution across text/image/audio/video/etc. (4) Extension analyzer — which MIME types claim an extension. (5) Conflict finder — find extensions claimed by multiple types. (6) Content-Type header builder — with charset for text types. (7) Accept header builder — with quality values (q=). (8) Export as JSON. (9) Quiz mode — test your MIME type knowledge. (10) Shareable URL — encode query in fragment.

What's the difference between MIME type and content type?

Nothing — they're synonyms. 'MIME type' is the historical name (from Multipurpose Internet Mail Extensions, RFC 2045). 'Content type' is what the HTTP Content-Type header is called. 'Media type' is the modern IANA term.

Why should I care about MIME sniffing?

Browsers may 'sniff' (guess) the actual content type if the server sends a generic type like application/octet-stream. An attacker could upload a malicious file labeled as an image, and the browser might execute it as a script. Always send X-Content-Type-Options: nosniff to prevent this. Our tool warns you when a type is vulnerable to sniffing.

Network, Runs in your browser

MIME Type Lookup

Look up MIME types by extension or vice versa. Magic bytes detection, IANA links, charset detection, sniffing risk warnings, .htaccess/nginx export, conflict finder, and quiz mode. 100% offline.

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Search by MIME type, extension, or filename

Detect from file

82 types

text/htmltext

HTML document

.html.htm

Aliases: application/xhtml+xml

text/csstext

Cascading Style Sheets

.css

text/plaintext

Plain text

.txt.text.log.conf.ini.properties

text/csvtext

Comma-separated values

.csv

text/xmltext

XML document

.xml

text/javascripttext

JavaScript module

.js.mjs

Aliases: application/javascript, application/ecmascript, text/ecmascript

text/markdowntext

Markdown

.md.markdown

text/yamltext

YAML

.yaml.yml

Aliases: application/yaml

text/tab-separated-valuestext

Tab-separated values

.tsv

text/vtttext

Web Video Text Tracks (subtitles)

.vtt

text/calendartext

iCalendar

.ics.ifb

application/jsontext

JSON data

.json

application/xmltext

XML (application)

.xml

application/pdfbinary

PDF document

.pdf

application/zipbinary

ZIP archive

.zip

application/gzipbinary

Gzip compressed

.gz.gzip

Aliases: application/x-gzip

application/x-tarbinary

Tar archive

.tar

application/x-7z-compressedbinary

7-Zip archive

.7z

application/x-rar-compressedbinary

RAR archive

.rar

application/x-bzip2binary

Bzip2 compressed

.bz2

application/x-xzbinary

XZ compressed

.xz

application/octet-streambinary

Binary data (generic fallback)

.bin.exe.dll.so.dylib

application/mswordbinary

Microsoft Word (legacy)

.doc

application/vnd.openxmlformats-officedocument.wordprocessingml.documentbinary

Microsoft Word (OOXML)

.docx

application/vnd.ms-excelbinary

Microsoft Excel (legacy)

.xls

application/vnd.openxmlformats-officedocument.spreadsheetml.sheetbinary

Microsoft Excel (OOXML)

.xlsx

application/vnd.ms-powerpointbinary

Microsoft PowerPoint (legacy)

.ppt

application/vnd.openxmlformats-officedocument.presentationml.presentationbinary

Microsoft PowerPoint (OOXML)

.pptx

application/vnd.oasis.opendocument.textbinary

OpenDocument Text

.odt

application/vnd.oasis.opendocument.spreadsheetbinary

OpenDocument Spreadsheet

.ods

application/vnd.oasis.opendocument.presentationbinary

OpenDocument Presentation

.odp

application/rtfbinary

Rich Text Format

.rtf

application/epub+zipbinary

EPUB ebook

.epub

application/x-mobipocket-ebookbinary

Mobipocket ebook

.mobi

application/vnd.amazon.ebookbinary

Amazon Kindle ebook

.azw

application/typescripttext

TypeScript

.ts

Aliases: text/typescript

application/json5text

JSON5 (extended JSON)

.json5

application/tomltext

TOML config

.toml

application/ld+jsontext

JSON-LD (linked data)

.jsonld

application/graphql+jsontext

GraphQL

.graphql

application/wasmbinary

WebAssembly

.wasm

application/x-yamltext

YAML (application)

.yaml.yml

image/jpegbinary

JPEG image

.jpg.jpeg.jpe.jif

image/pngbinary

PNG image

.png

image/gifbinary

GIF image (animated or static)

.gif

image/webpbinary

WebP image

.webp

image/svg+xmltext

SVG vector image

.svg.svgz

image/avifbinary

AVIF image (modern)

.avif

image/heicbinary

HEIC/HEIF image (Apple)

.heic.heif

image/bmpbinary

Bitmap image

.bmp

image/tiffbinary

TIFF image

.tiff.tif

image/x-iconbinary

Windows icon

.ico.cur

image/vnd.adobe.photoshopbinary

Photoshop document

.psd

audio/mpegbinary

MP3 audio

.mp3

Aliases: audio/mp3

audio/mp4binary

MP4 audio

.m4a.mp4a

audio/oggbinary

Ogg Vorbis audio

.ogg.oga

audio/wavbinary

WAV audio

.wav

Aliases: audio/x-wav, audio/wave

audio/webmbinary

WebM audio

.weba

audio/flacbinary

FLAC lossless audio

.flac

audio/aacbinary

AAC audio

.aac

audio/midibinary

MIDI

.mid.midi

Aliases: audio/x-midi

audio/x-mpegurltext

M3U playlist

.m3u.m3u8

video/mp4binary

MP4 video

.mp4.m4v

video/webmbinary

WebM video

.webm

video/oggbinary

Ogg video

.ogv

video/x-msvideobinary

AVI video

.avi

video/quicktimebinary

QuickTime video

.mov.qt

video/x-matroskabinary

Matroska video

.mkv

video/mpegbinary

MPEG video

.mpeg.mpg

video/3gppbinary

3GP video (mobile)

.3gp

video/x-flvbinary

Flash video

.flv

font/woffbinary

WOFF font

.woff

font/woff2binary

WOFF2 font

.woff2

font/ttfbinary

TrueType font

.ttf

font/otfbinary

OpenType font

.otf

application/vnd.ms-fontobjectbinary

Embedded OpenType font (legacy)

.eot

multipart/form-datatext

Multipart form data (file uploads)

multipart/byterangestext

Multipart byte ranges (206 responses)

model/gltf-binarybinary

glTF binary 3D model

.glb

model/gltf+jsontext

glTF JSON 3D model

.gltf

model/objtext

Wavefront OBJ 3D model

.obj

model/stlbinary

STL 3D model

.stl

Privacy: lookup is local — no network requests. Magic bytes detection reads only the first 32 bytes of your file in-browser.

Look up MIME types by extension or vice versa. Magic bytes detection, IANA links, charset detection, sniffing risk warnings, .htaccess/nginx export, conflict finder, and quiz mode. 100% offline. Everything runs locally in your browser — your data never leaves your device.

How to use

Enter your input in the tool above.
Adjust any options to your preference.
Use the Copy or Download buttons to save the result.
Everything happens locally — your data never leaves your browser.

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