JPEGsnoop is a free, portable detailed image decoder that examines any file type containing JPEG compressed images and reports a wealth of hidden information.

It can even be used to determine the source of an image or whether it has been edited. Can open .JPG, .THM, .AVI, .DNG, .PDF and extract embedded JPEG files. JPEGsnoop reports countless details, including image quality, EXIF / IPTC metadata, huffman table decode, etc.

JPEGsnoop will open and attempt to decode any file that contains an embedded JPEG image, such as:

• .JPG - JPEG Still Photo
• .THM - Thumbnail for RAW Photo / Movie Files
• .AVI* - AVI Movies
• .DNG - Digital Negative RAW Photo
• .CRW, .CR2, .NEF, .ORF, .PEF - RAW Photo
• .MOV* - QuickTime Movies, QTVR (Virtual Reality / 360 Panoramic)
• .PDF - Adobe PDF Documents