All about ROOT Files

The ROOT file type is primarily associated with ROOT.

ROOT	File extension: ROOT
	File type:	binary data file

What is a ROOT file?

ROOT files mostly belong to ROOT. ROOT files are binary files used with the ROOT data analysis framework developed at CERN. They store research data in a hierarchical structure that organizes information in trees, branches, and leaves to improve access to complex data sets.

They are optimized for scientific data analysis, especially in high energy physics.

They include self-descriptive metadata that defines the types and structure of the stored data.

They support interactive use with tools like the TBrowser and macros for custom analysis.

FilExt.com note: This file format is central to the analysis of experimental and simulation data. For more technical details and updates, visit the ROOT website.

How to open a ROOT file

You need a suitable software like ROOT to open a ROOT 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 ROOT file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a ROOT file directly in the browser:. Just drag the file onto this browser window and drop it.

Online ROOT Text Viewer

Choose your .root file to analyze

or drag and drop it here

Online File Viewer

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Programs that open and convert ROOT files:

ROOT
See the previous paragraphs to learn more about the main application. ROOT files are often referred to as ROOT data files because this type of file is primarily created or used by this software.
ROOT (Data File) by Rene Brun & Fons Rademakers
The ROOT system provides a set of OO frameworks with all the functionality needed to handle and analyse large amounts of data in a very efficient way. Basically, a .ROOT file is any C++ object. The Mime types used with this association are: application/octet-stream.

ROOT file format:

The file format determines how the data is stored in the file. The first characters in a file identify the file format, for example, HTML files start with the bytes <html>. However, different programs can use the same file extension. Furthermore, a file extension can be renamed incorrectly and double-clicking on it will then display an error when it is opened. Exact knowledge of the format is therefore important in order to solve problems occurring in files. Our evaluation of the ROOT files is as follows:

An ROOT file mainly uses a special format. The two most popular formats are as follows:

85% of all ROOT files are ROOT format files. These are binary files, so they do not contain words or text. A typical file size is 300 KB. The file type was developed only in the last few years. Certain words are almost always found in the files, such as root and TFile. These files are often associated with data, events, output, background, hcompass, mclassevent, official, practice, testem, train and ttbar.

All other ROOT files (15%) have different formats. The category is install. Just click the "Choose your .root file to analyze" button on this page to find out what your ROOT file is.

Technical Data for ROOT File Extension

File classification:

Data

Related files:

c, cpp, h, py, rootmap, so, rooe, repository, roor, rote, sou, coot, entries, zip, passwd, txt, shadow, r00, jpg, js, html, apk, png, exe

Mime type:

application/octet-stream

a root binary data file is a special file format and should only be edited and saved with the appropriate software.

How to solve problems with ROOT files

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