THUMBDATA5 files are commonly found on storage devices managed by Android operating system. THUMBDATA5 files are generated by Gallery application which is used for browsing, viewing, and storing images and photos.

THUMBDATA5 files store thumbnail images for related image files. Data in such files allow users to quickly access previews of images managed by Gallery app. THUMBDATA5 files can be as larger as hundreds of megabytes depending on the size of image collection.