What is a TN3 file?
A .TN3 file usually contains a JPEG thumbnail image created by OpenText EnCase, a digital forensics program. Forensic investigators use these files to preview image evidence quickly. Because the .TN3 extension is used by different developers, it can also refer to an animated video thumbnail related to the Google WebP format. In the construction and surveying industry, .TN3 files store 3D machine control surfaces for Topcon Positioning Systems. Historically, the extension was also used for the Tiny High-resolution Image format on classic Atari computers.
How to open TN3 files?
Because a .TN3 file has multiple possible meanings, it is difficult to know which software to use. viewer.online/tn3 analyzes .TN3 files to identify their exact format and creator software, shows which programs can open the file, and usually previews it. If you need to use the file in standard applications, we recommend file conversion to sensible target formats like .JPG or .PNG on convert.guru.
Software and tools
If you know the origin of your .TN3 file, you can use specific desktop software. Forensic professionals use OpenText EnCase to view evidence thumbnails. If the file is an animated video thumbnail, you can usually play it with the VLC media player. For 3D models, engineers use Topcon Tools.
Summary
viewer.online/tn3 directly opens and previews .TN3 files in the browser, eliminating the need to install software or troubleshoot compatibility issues.