Windows
Compatible applications
Quick Facts
Basic information about this file format
Extension
.MOL2
File Type
Tripos Mol2 File Format
Category
Data
Best first step
Use compatible software
Quick Summary
A practical overview of the .mol2 file format
The MOL2 file format, originally developed by Tripos for its Sybyl molecular modeling software, is a widely used standard in computational chemistry and bioinformatics for representing molecular structures. Unlike simpler formats like XYZ or PDB, the MOL2 format is highly comprehensive, storing not…
File extension
.MOL2
File type
Tripos Mol2 File Format
Category
Data
Recommended action
Open with a trusted compatible app
How to open a .mol2 file
Start with a trusted app that supports this format
- Check the file extension carefully and confirm that the file name really ends with .mol2.
- Use software that supports this file type. If one app does not work, try another compatible program for the same platform.
- Update the application if the file was created by a newer version of the software.
- Scan files from unknown sources before opening them, especially documents, archives, scripts, installers, and executable files.
What is a .mol2 file?
File extension details and usage information
The MOL2 file format, originally developed by Tripos for its Sybyl molecular modeling software, is a widely used standard in computational chemistry and bioinformatics for representing molecular structures. Unlike simpler formats like XYZ or PDB, the MOL2 format is highly comprehensive, storing not only the three-dimensional coordinates of atoms but also detailed information regarding chemical bonding, atom types, partial charges, and substructure relationships. It is specifically designed to be a complete representation, meaning it contains all the necessary information to reconstruct a molecular model without requiring external references or libraries. Each file is organized into hierarchical sections known as Record Types, such as MOLECULE, ATOM, and BOND, which allow for structured data parsing. This format is particularly favored in docking studies, pharmacophore modeling, and quantitative structure-activity relationship (QSAR) analysis because it explicitly defines bond orders and atom hybridization states, which are critical for accurate force field calculations and molecular simulations. Its ability to handle multiple molecules within a single file also makes it useful for managing chemical libraries.
Software Compatibility
Programs that may open or work with .mol2 files
macOS
Compatible applications
Linux
Compatible applications
Mobile
Mobile applications
Can .mol2 files be converted?
Options for saving or exporting this file to another format
In many cases, a .mol2 file can be converted by opening it in compatible software and using an option such as Save As, Export, or Convert. The available output formats depend on the file type and the application used.
- Use the original software that created the file when possible.
- Check whether the application supports exporting to common formats.
- Be careful with online converters when working with private, business, or sensitive files.
- If conversion fails, the file may be corrupted, incomplete, encrypted, or not actually a .mol2 file.
Why can't I open a .mol2 file?
Common reasons this file type may not open correctly
Wrong software
The file may require a specific program that supports the .mol2 format.
Incorrect extension
The file extension may have been renamed manually, even though the actual file format is different.
Corrupted file
The file may be incomplete, damaged during download, or transferred incorrectly.
Outdated app
Your software may need to be updated before it can open newer versions of this file format.
Frequently Asked Questions
Common questions about .mol2 files
To open a .mol2 file, use software that supports this file format.
- PyMOL
- Avogadro
- VMD
- BIOVIA Discovery Studio
- ChemOffice
Open the file in compatible software and look for options such as Save As, Export, or Convert. If no export option is available, the file may require a specialized converter or the original application that created it.
- Verify that the file extension is correct.
- Install or update compatible software.
- Try another application that supports this format.
- Check whether the file is corrupted, incomplete, or encrypted.
A file extension alone does not guarantee whether a file is safe or unsafe. Only open files from trusted sources, scan unknown files before opening them, and be especially careful with executable, script, archive, and document files.
File safety tips
Use caution with unknown files
Only open files from trusted sources. Before opening a .mol2 file, scan it with antivirus software, verify that the file extension is expected, and avoid running unknown executable, installer, macro-enabled document, or script files.