Over time, these files can swell to several gigabytes. Even if you delete the original photos from your camera roll, the cached previews often remain trapped inside the hidden .thumbdata file. This results in "ghost storage" where your phone claims to be full, but you cannot see what is taking up the space. Can You View .thumbdata Files Directly?
Navigate to Internal Storage > Android > data > com.android.gallery3d (the exact path varies slightly by phone brand).
Since these files are essentially containers for JPEG data, you can often trick your computer into opening them. the file to your PC. Right-click and select Rename . thumbdata viewer free
: It is generally safe to delete .thumbdata files if they are consuming too much space; the Android system will simply regenerate them as you browse your gallery again.
thumbdata-viewer.net (or similar online Java-based tools). Over time, these files can swell to several gigabytes
Because Android will immediately try to recreate the file, use this trick to block it permanently:
This does not give viewable images directly, but you can confirm whether the file contains intact JPEG data: Can You View
This online tool works by finding JPEG markers in the file and extracting them, functioning as a fully client-side JPEG extractor.
Many thumbdata parsers were written for Android 4–6 (KitKat to Marshmallow). Newer Android versions (10+) use different thumbnail databases, so those old tools may crash, show gibberish, or contain malware.