If you only want to view the first few thumbnails without installing extra apps, use a file manager that can copy the file to your computer. However, a quick preview method on Android (with Termux – free) is:
Do not download random "thumbdata viewers" from pop-up ads. Go to a trusted repository like GitHub. Search for "Thumbdata Extractor Python Script" or use the pre-compiled "Thumbnail Viewer" by user k3a . thumbdata viewer free
However, the free thumb data viewers also have some limitations, including: If you only want to view the first
Why this works: Thumbdata files store thumbnails as raw JPEG streams separated by non-JPEG metadata. Binwalk identifies the JPEG headers ( FF D8 FF ) and carves them out. Search for "Thumbdata Extractor Python Script" or use
Let’s say you have copied thumbdata4--1967290299 from your Android phone.
This is a common concern. Using a tool is entirely legal if you are analyzing your own data or an SD card you own.