These files can grow to several gigabytes in size. Users often want to see what is inside before deciding whether to delete them. Forensics/Recovery: .thumbdata
Thumbdata viewers enable users to access, manage, and extract images from hidden Android cache files (e.g., .thumbdata3) that often retain previews of deleted photos and consume significant storage. Tools such as the client-side Thumbdata3 Viewer and various file management techniques allow for recovering these images and reclaiming space, with some tools also serving forensic purposes. Thumbdata3 Viewer - Online JPEG extractor thumbdata viewer