.jpeg File Extension

What kind of file is a .jpeg?

A .jpeg file is a JPEG image, usually a photograph compressed to balance visual quality and file size. Its standard media type is image/jpeg, and a conforming file commonly begins with the bytes FF D8 FF.¹ Check those bytes and parse the JPEG markers when a filename may be misleading. The suffix alone cannot prove what is inside a file.

The .jpeg and .jpg suffixes represent the same image format. Neither spelling produces better quality or different compression. .jpeg is simply the longer filename convention, while .jpg is its three-character counterpart.

How do I open a .jpeg on my computer?

Most systems open .jpeg files without extra software:

• On Windows, use Microsoft Photos, Paint, or a current web browser.
• On macOS, use Preview or Photos. Preview can also resize, annotate, and export an image to another format.²
• On Linux, open it in the desktop image viewer, GIMP, or a browser.
• On iPhone, iPad, and Android, use the built-in Photos or Files app.

Photo editors including Adobe Photoshop, Affinity Photo, and GIMP are better choices for detailed adjustments. Keep an original before repeated edits because exporting a JPEG again can discard more image information.

Poly support for .jpeg

Poly gives .jpeg images thumbnails and an in-app image preview. It indexes the filename, available camera metadata, and visual content, so you can search for a picture by what it depicts. The Poly agent can also interpret the visible image.

Text photographed inside an ordinary JPEG is not indexed like document text. Exif metadata may include capture time, camera and lens details, and GPS coordinates. Review that information before sharing a sensitive photo. The IANA registration specifically notes that JPEG metadata can expose private information such as geolocation.¹

History of .jpeg

Work on the original JPEG standard began in 1986, and JPEG 1 was created in 1992. Its core is ISO/IEC 10918-1 and ITU-T Recommendation T.81; JFIF later standardized common interchange details for JPEG files.³

The .jpeg spelling fits the format's name naturally. The alternate .jpg spelling became important on older MS-DOS FAT systems, whose 8.3 filenames allowed only three characters after the period.⁴ Modern filesystems allow both spellings, and IANA registers both jpeg and jpg for image/jpeg.¹

Working with .jpeg and alternatives

JPEG works particularly well for photographs and continuous color gradients. It is usually lossy, so sharp lettering, interface screenshots, and flat-color illustrations can acquire halos or block artifacts. The quality setting, encoder, chroma subsampling, and image content all affect the result; there is no fixed JPEG compression ratio.

Choose a destination based on the job:

In Google's documented study, WebP files were 25% to 34% smaller than JPEG at equivalent or slightly better SSIM across its tested image sets and quality levels.⁵ That result is a benchmark, not a promise for every photo. Test representative images and inspect decoded output at the size people will actually view.

Converting a .jpeg to a lossless format avoids another lossy JPEG save, but it cannot recover detail already removed. Preserve the best available source when future editing matters.