image/*

image/jpeg

File extensions: .jpg, .jpeg

Lossy raster format — the web default for photographs.

What is image/jpeg?

image/jpeg is the media type for JPEG images — the ubiquitous lossy format for photographs. Files can be dramatically smaller than PNG at good visual quality but do not support transparency.

Typical usage

Photographs, banner images, thumbnails, anything where file size matters more than pixel-perfect fidelity.

Common gotchas

JPEG uses lossy DCT compression — never re-save a JPEG multiple times, quality degrades with each save. Modern alternatives (WebP, AVIF) offer better compression at the same quality.

HTTP header example

Response header

Content-Type: image/jpeg

Reference

RFC 2046

Related MIME types

image/png

PNG

image/webp

WebP

image/avif

AVIF

image/gif

GIF

image/svg+xml

SVG

image/x-icon

ICO (favicon)