JPG MIME Type

About JPEG image files

The type is image/jpeg for both extensions; image/jpg is a common typo that is not registered, although browsers display it anyway. Upload validators that check for an exact type should accept the correct name and, if needed, the typo, but not rely on either: check that the file starts with FF D8 FF.

Other types seen for these files: image/jpg , image/pjpeg . Accept them when reading uploads, but send image/jpeg yourself.

File signature

JPG files start with FF D8 FF. The extension and the type a browser reports for an upload both come from the file name, so check these bytes on the server before trusting a file.

Serve .jpg with the right Content-Type

Content-Type: image/jpeg

image/jpeg jpg jpeg jpe jfif;

AddType image/jpeg .jpg .jpeg .jpe .jfif

@jpg path *.jpg *.jpeg *.jpe *.jfif
header @jpg Content-Type "image/jpeg"

curl -sI https://example.com/file.jpg | grep -i '^content-type'
# Content-Type: image/jpeg

Set the type in code

res.set('Content-Type', 'image/jpeg');
// Or make the browser download it:
res.attachment('file.jpg');

import mimetypes

mimetypes.add_type('image/jpeg', '.jpg')  # if your system doesn't know it
mimetypes.guess_type('file.jpg')[0]  # 'image/jpeg'

mime.AddExtensionType(".jpg", "image/jpeg")
w.Header().Set("Content-Type", "image/jpeg")

Accept .jpg uploads

<input type="file" accept=".jpg,.jpeg,.jpe,.jfif,image/jpeg">

The accept attribute only filters the file picker; users can still choose another file. Listing the extension as well as the type matters, because operating systems don’t always report the type you expect.

Related types

• .png (image/png): PNG image
• .webp (image/webp): WebP image
• .avif (image/avif): AVIF image
• .heic (image/heic): HEIC image

More images

.gif , .ico , .bmp , .tiff . Look up any extension or type with the MIME type lookup.

Sources

• IANA registration: image/jpeg
• MDN: Common media types

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Frequently asked questions