What is a .JPEG file?
JPEG is the most widely used photo format, using lossy compression to keep files small. It is the default for most cameras, phones and the web.
- Did you know
- No JPEG can be larger than 65,535 pixels on a side, because the format stores image width and height as 16-bit numbers.
- JPEG stands for the Joint Photographic Experts Group, the committee that designed the format.
- Its lossy compression works by transforming 8-by-8 pixel blocks with the discrete cosine transform, then discarding fine detail.
- On the web a .JPEG file is served with the MIME type
image/jpeg. - Analyser spots a .JPEG file by its signature bytes
FF D8 FF.
- What Analyser shows you
- View EXIF, GPS, camera settings, histograms, dominant colours, OCR text, and AI-generation markers in JPG, PNG, HEIC, WebP, GIF, BMP, TIFF, AVIF and JPEG XL images. Detects computational-photo wrappers (Apple Live Photo, Google and Samsung Motion Photo, Ultra HDR gain maps), opens THM movie-thumbnail files, and extracts every embedded image from multi-image files - all sizes in an ICO, both halves of an MPO stereo pair, and every page of a multi-page TIFF.
- Open a .JPEG file
- Drag a .JPEG file onto the Analyser home page (or tap to pick one). It opens entirely in your browser - nothing is uploaded, there is no account, and it works offline once installed.