Extract text from thumbnail images (TN)
To convert TN thumbnails to another format, you need Adobe Photoshop or other Raster Image software.
To convert other file formats to the "Thumbnail Cache File" file type, you need software like Adobe Photoshop or a similar tool.
The .TN file format stores small, low-resolution image previews. Digital cameras, Google Android OS, Adobe Photoshop, and the discontinued Google Picasa generate these files to load image galleries faster without reading the heavy, full-sized original images.
The primary disadvantage of a .TN file is its extremely low resolution and lack of standard image headers. These files are system-generated cache data, meaning standard image viewers usually refuse to open them directly. Furthermore, the format is highly fragmented. A .TN file from an Android phone is often formatted as JSON text containing a Base64-encoded image string, while a .TN file from a digital camera might just be a raw, headerless JPEG stream. Because they are cache files, they clutter device storage and provide zero high-quality image data.
Users typically want to convert .TN files to standard formats like JPG or PNG to view the cached images, which is especially critical if the original high-resolution photos were accidentally deleted. Standard online converters almost always fail to process them because they cannot handle the unpredictable internal structure (JSON vs. raw binary).
Convert.Guru analyzes your TN file, detects the exact format, and lets you read the text inside.
Users also converted TN3, TN6, ARC, JPG, TNS, PNG, PDF, MJP, DVR-MS, LBF, CY and MT files.
If you want to convert TN file to CY, MT, JPG, PDF, PNG, GIF, BMP, TIFF, TIF, WEBP, ICO or CUR, you can use Adobe Photoshop or similar software from the "Image Preview Caching" category. In the File menu, look for Save As… or Export….
To convert RAW, PNG, AI, NEF, PSB, DNG, SVG, GIF, EPS, JPG, ARW or PDF files to TN, try Adobe Photoshop or another comparable tool in the "Image Preview Caching" category.
The history of Convert.Guru began over 25 years ago in California with Tom Simondi’s file-format database. A former contributor to Space Shuttle development and a software pioneer of the 1980s, Simondi established a trusted resource for file type analysis that was even referenced by Microsoft Windows XP. Today, we use modern technology to process and convert thousands of file formats while continually improving our TN converter.