Home : File Types : CTB File

.CTB File Extension

File TypeAutoCAD Color-Based Plot Style File

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CategorySettings Files


This file is saved in a binary format, which requires a specific program to read its contents.

What is a CTB file?

File used by AutoCAD, a CAD program used for 2D and 3D drawing; contains color-based plot styles, or mappings of colors to layers of objects; used to attach color and display settings to design objects.

More Information

CTB files can be replaced by the newer .STB format, which abstracts layer color-based properties to object-based properties. Many companies still use CTB files instead of STB files because of the cost required to train personnel and to upgrade existing CAD designs.

NOTE: CTB files and STB files cannot both be used within the same CAD design. CTB files may be converted to STB files using AutoCAD.

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Programs that open CTB files
Autodesk AutoCAD 2017
Updated 1/6/2010

.CTB Extension Information

This page contains information about the file extension CTB and its known file associations. Our goal is to help you understand what a *.ctb file is and how to open it.

The AutoCAD Color-Based Plot Style file type, file format description, and programs listed on this page have been individually researched and verified by the FileInfo team. We strive for 100% accuracy and do not publish any information we have not verified.

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