Use a Thumbdata viewer when you need to recover low-res previews of lost media or audit cached thumbnails. For most users, simply deleting large thumbdata files via a root explorer is sufficient. For privacy or forensic needs, specialized viewers or Python extraction scripts give you full visibility into what Android has cached.
While thumbdata files are useful, they are not without their downsides. Because they contain images and metadata, they present a privacy risk. thumbdata viewer