Opening a TN3 File

The TN3 file type is primarily associated with 3D Office.

TN3	File extension: TN3
	File type:	surface or line work

What is a TN3 file?

TN3 files mostly belong to 3D Office by Topcon. TN3 is the filename extension of files containing surfaces and line work created by 3D Office (a computer software used to prepare 3D job files for sites). TN3 surfaces and line works are typically exported and used for machine control on field tools such as 3DMC grade control software, Topcon GPS devices, Carlson Survey, and Trimble GPS/GIS products. A family of smart TVs manufactured by LG automatically generate WEBP video thumbnails stored in TN3 files when a USB containing video files is connected to the television set. TN3 filename extension is also associated with animated and still images saved in the Tiny Stuff raster graphics format used by Atari ST computers. Image data stored in TN3 files are compressed using Run-Length encoding and the image's dimension is 640x400 pixels. The contents of such TN3 images are split into three main sections including the header, control, and image data.

How can I open a TN3 file?

You need a suitable software like 3D Office to open a TN3 file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your TN3 file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a TN3 file directly in the browser:. Just drag the file onto this browser window and drop it.

Online TN3 File Viewer

Choose your .tn3 file to view this image

or drag and drop it here

Online File Viewer

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How to convert a TN3 file to JPG, PDF, HTML, DOC, ...

If you want to convert or edit a TN3 file, you can use our free Online TN3 File Converter (powered by Convert.Guru):

To do this, click the button "Choose your .tn3 file to view this image" on this page.
After your file is opened in browser,
click "Save as..." in the menu.
Then click the file format (e.g. PDF, JPG, DOCX, TXT, ...) you want.
Your file will be converted and downloaded.

Programs that open and convert TN3 files:

3D Office by Topcon
See the previous paragraphs to learn more about the main application. TN3 files are often referred to as 3D Office cads because this type of file is primarily created or used by this software.
LG Smart TV (video thumbnail) by LG
A series of smart television sets produced by LG save video thumbnails in the /LG Smart TV/ folder of a USB drive that is connected to it. The thumbnails are encoded in WEBP format and stored in RIFF container files that have TN3 filename extension. This file format is classified as Raster Image.
XnView (image) by XnSoft
XnView is a cross-platform application for viewing, editing, and converting images. It can be used to open images stored in the Tiny Stuff file format used by Atari ST computers. Such images have TNY, TN1, TN2, or TN3 filename extension. This file format is classified as Raster Image. Related links: XnView

TN3 file extension format:

To view or edit TN3 files you need to know the file format, because it determines how the data in this file is stored. The first characters in a file identify the file format, for example, HTML files start with the bytes <html>. If the file extension does not match the file format, double-clicking on the file will cause an error upon opening. Exact knowledge of the format is therefore important in order to solve problems occurring in files. In the following you will find our evaluation of the TN3 files:

TN3 is one of the most common file extensions and is mainly used by one program with a specific format. The two most common formats are as follows:

95% of all TN3 files internally utilize the JFIF file format. JFIF is short for JPEG File Interchange Format. It is a bitmap graphic that uses JPEG compression. They consist of unreadable binary data. Most of these files are 25 KB to 77 KB in size. The file type is relatively new. Certain words are almost always found in the files, such as JFIF. Such files are related to movie, fotos, video, dcim, videos, photos, folder, pictures, carpeta and nueva.
4% of all TN3 files are based on the well-known RIFF file format. RIFF files store data in tagged chunks. There are primarily used to store multimedia such as sound and video. The content consists of illegible binary data, which can only be read and interpreted by the associated programs. The files are 19 KB to 59 KB in size, with a median of 39 KB. The keywords ANIM, WEBPVP8X, RIFF and ANMF are typical for these files. These files are attributed to chernobyl, movies, eztv, bautizo, wedding, avseq and mpega.

All other TN3 files (1%) have different formats, the following 3 formats can be found: Topcon. Files like these are sometimes linked to jpeg, photo, camera, iphone, foto, music or dscn. You can get all the details of your TN3 file by dragging it onto this page or by clicking the button "Choose your .tn3 file to view this image" above.

Technical Data for TN3 File Extension

File classification:

CAD

Related files:

info, jfif, tn, jpg, nt3, 000000010000000astr, ln3, tp3, lg_dvr_dev, mp4, tn4, 0000000100000001str, tnt, pn3, mpg, gc3, webp, exe, zip, lge

Mime type:

application/octet-stream

The following listing is compiled from the database produced by the 'Associate This!' program, selected data from the main FILExt database and file extension information submitted by users.

ProgramID: GraphicsConverterPro.tn3, FileType: Tiny, AppName: GraphicsConverter-reg
EXEFile: GraphicsConverter.exe

ProgramID: hcltn3270
EXEFile: %ProgramFiles%\exceed.nt\tn3270.exe @%1

ProgramID: XnView.Image
EXEFile: %ProgramFiles%\XnView\xnview.exe %1

a tn3 surface or line work is a special file format by Topcon and should only be edited and saved with the appropriate software.

How to solve problems with TN3 files

Associate the TN3 file extension with the correct application.
Update your software that should actually open surface or line works. Because only the current version supports the latest TN3 file format. Search, therefore, e.g. on the Topcon manufacturer website after an available 3D Office update.
To make sure that your TN3 file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .TN3 file online - secure, fast, and no downloads needed.