CMBL File

What are CMBL files and how to open them

Are you having problems opening a CMBL file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your CMBL files.

What is a CMBL file?

A .CMBL file is a Vernier Logger Pro Data file.

Vernier Logger Pro Data files store the whole setup of an experiment created in the Logger Pro software: measured sensor data, manually entered numbers or calculated columns, graph and table layouts, any linked media (videos or images), and metadata about units, precision, trigger settings and sample rate.

These files are written by Logger Pro for Windows and macOS when saving an experiment session. They are used for archival, sharing experiments with others, or re-opening later to continue analysis. The software can also export data from them to CSV and other simpler formats for use outside Logger Pro.

The files are XML-based text by default, though Logger Pro offers a binary/compressed mode. They include identifiable keywords such as DATASETNAME, DATACOLUMN, COLUMNUNITS, MBLCOLLECTIONNUMSAMPLES, and APPLICATIONBUILDDATETIME. Their content begins with an ASCII tag <Document> at offset 0, and they contain specific strings like MBLCOLLECTIONSELECTEDEVENTTIME and DATAOBJECTPRECISIONDECIMAL among others.

How to open CMBL files

Important: Different programs may use files with the CMBL file extension for different purposes, so unless you are sure which format your CMBL file is, you may need to try a few different programs.

While we have not verified the app ourselves yet, our users have suggested a single CMBL opener which you will find listed below.

Last updated: August 31, 2026

Various apps that use files with this extension

These apps are known to open certain types of CMBL files. Remember, different programs may use CMBL files for different purposes, so you may need to try out a few of them to be able to open your specific file.

Help us help others

File.org helps thousands of users every day, and we would love to hear from you if you have additional information about CMBL file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.