The BLOB decoder tool can decode Binary Large Objects (BLOBs) into the image or file they represent. BLOBs were added to GEDCOM 5.5 with the intention to allow multimedia files to be stored within the GEDCOM file. The concept quickly became obsolete and was depreciated when GEDCOM 5.5.1 was released. Few applications write BLOBs and ever fewer can decode them. If you come across a file which contains BLOB data, it can be entered with or without tags and will be decoded into binary and hex forms. If the data is recognised as a valid image format, an image of the file will also be displayed. You can save the decoded data to a file name of your choice.
Fig 1. The BLOB decoder tool.