Tool to extract / read the stored thumbnail of an image. EXIF format (Exchangeable image file format) allows the storage of a thumbnail image inside another image.
EXIF Thumbnail - dCode
Tag(s) : Image Processing
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EXIF Thumbnail
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Answers to Questions (FAQ)
How to read EXIF Thumnnail data?
Indicate the image file to upload (JPG, PNG or other EXIF compatible format) and dCode will automatically read the EXIF data and especially the Thumbnail field containing the thumbnail if it exists, otherwise, it will not return any results.
Example: The following image has been modified to incorporate a thumbnail containing a secret message: 
What is the Thumbnail EXIF metadata?
The EXIF metadata format applies to image files and allows them to store various additional information (in addition to the image pixel data) such as information on the author, source etc. There is a field dedicated to storing a thumbnail which allows you to save a smaller and quicker version of the image.
Extracting the data may return an unreadable image file.
Why extracting EXIF Thumnnail data?
Indicate the image file to upload (JPG, PNG or other EXIF compatible format) and dCode will automatically read the EXIF data and especially the Thumbnail field containing the thumbnail if it exists, otherwise, it will not return any results.
Sometimes the thumbnail can reveal information, it happened that some images were blurred or censored but their thumbnail was not updated, so it is possible to guess the original content.
Source code
dCode retains ownership of the online "EXIF Thumbnail" source code. Except explicit open source licence (indicated CC / Creative Commons / free), the "EXIF Thumbnail" algorithm, the applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or the "EXIF Thumbnail" functions (calculate, convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (Python, Java, PHP, C#, Javascript, Matlab, etc.) and all data download, script, copy-paste, or API access for "EXIF Thumbnail" are not public, same for offline use on PC, tablet, iPhone or Android ! Remainder : dCode is free to use.
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Questions / Comments
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