What is a CTB file?
A .CTB file is primarily an AutoCAD Color-Based Plot Style File. Autodesk developed this format for AutoCAD to map drawing colors to specific line weights, styles, and other settings for printing.
However, the .CTB file extension has multiple other uses. It can be an encrypted hierarchical notes file created by the CherryTree application. It can also be a sliced 3D printer file generated by CHITUBOX for resin 3D printing. Finally, it can act as a radio programming codeplug file for Motorola Solutions devices.
How to open CTB files?
Because .CTB has multiple possible meanings, it can be difficult to know which software to use. You can load plot styles directly into the Plot Styles folder in AutoCAD. You can open notes files using the CherryTree application. You can load resin slicer files onto a USB drive for your 3D printer using CHITUBOX.
If you do not know the origin of your file, viewer.online/ctb can analyze .CTB files to identify the exact format and creator software, inspect the file structure, extract readable text, and check whether an online preview is available.
Best practices and troubleshooting
A common problem is receiving a .CTB file without knowing which software created it. Do not attempt to force a file to open in the wrong software. Instead, use an analysis tool to inspect the file headers. If you need the contents in a more accessible format, recommend file conversion to sensible target formats on convert.guru. For example, you can export CherryTree notes to .TXT or .PDF.
Software and tools
- AutoCAD for CAD plot styles.
- CherryTree for SQLite-based hierarchical notes.
- CHITUBOX for resin 3D printing.
- Motorola Solutions CPS for radio configuration codeplugs.
Summary
viewer.online/ctb is useful for identifying, inspecting, and understanding .CTB files without installing software or dealing with compatibility problems.