MIME Types & Content-Type Header Directory
Search common web MIME types, file extensions, Content-Type HTTP response headers, NGINX / Apache configs, and web security advisories.
JSON (JavaScript Object Notation)
application/json is the universal MIME type for exchanging structured data in modern REST APIs, GraphQL, and configuration files. Defined in RFC 8259, it does not require a charset parameter as UTF-8 is mandated by default.
PDF (Portable Document Format)
application/pdf represents Adobe Portable Document Format files. Widely used for invoices, printable reports, whitepapers, and legal contracts across web browsers.
JavaScript / ECMAScript
application/javascript is the official IANA standard MIME type for JavaScript source code (superseding text/javascript in RFC 4329, though both are accepted by modern browsers).
WebAssembly Binary (Wasm)
application/wasm is the required MIME type for streaming WebAssembly binaries. WebAssembly.instantiateStreaming() strictly rejects any response that does not send application/wasm.
XML (Extensible Markup Language)
application/xml is used for XML documents, SOAP APIs, RSS/Atom feeds, and XML sitemaps.
ZIP Archive
application/zip denotes standard PKZIP compressed file archives.
Binary Data / Arbitrary Byte Stream
application/octet-stream is the RFC 2046 fallback MIME type for unknown binary files. Web browsers typically prompt the user to download the file rather than rendering it.
WebP Image
image/webp is Google's modern web image format providing both lossy and lossless compression with alpha transparency. WebP files are typically 25–34% smaller than comparable JPEGs and PNGs.
SVG (Scalable Vector Graphics)
image/svg+xml is the XML-based vector graphics format for two-dimensional interactive graphics, icons, and logos.
PNG (Portable Network Graphics)
image/png is the standard raster graphics format supporting lossless data compression and full 8-bit alpha transparency.
JPEG / JPG Image
image/jpeg is the most universally supported lossy compression format for digital photographs and realistic images.
AVIF Image (AV1 Still Image File Format)
image/avif is the next-generation image codec derived from AV1 video frames. Delivers up to 50% better compression efficiency than JPEG with HDR and wide color gamut support.
HTML (HyperText Markup Language)
text/html is the foundational MIME type of the World Wide Web, telling browsers to interpret the payload as an interactive DOM document.
CSS (Cascading Style Sheets)
text/css instructs browsers to parse the file as styling rules. In strict mode, modern browsers will refuse to load stylesheets with non-text/css MIME types.
CSV (Comma-Separated Values)
text/csv is the IANA MIME type for tabular data formatted with comma delimiters as defined in RFC 4180.
Markdown Document
text/markdown is defined in RFC 7763 for plain text documents utilizing Markdown formatting syntax.
WOFF2 (Web Open Font Format 2.0)
font/woff2 is the recommended W3C font format for the web, utilizing Brotli compression to achieve ~30% smaller file sizes than WOFF 1.0.
MP4 Video (MPEG-4 Part 14)
video/mp4 is the universally supported digital multimedia container format for H.264/AVC or H.265/HEVC video with AAC audio.
MP3 Audio (MPEG Audio Layer III)
audio/mpeg is the standard MIME type for MP3 compressed digital audio tracks and podcast streams.
Multipart Form Data (File Uploads)
multipart/form-data is used in HTTP POST requests when submitting HTML forms containing file uploads (`<input type="file">`). Each form field is separated by a unique boundary delimiter string.
URL-Encoded Form Data
application/x-www-form-urlencoded is the default encoding for standard HTML form submissions, formatting key-value pairs as query parameters separated by `&` with percent-encoding.