LESS File Extension
LESS Style Sheet
- File Type less
- Developer Alexis Sellier
- Popularity
- Application Middleman
- Category Developer Files
- Format Text
What is a LESS file?
The LESS extension is related to LESS Style Sheet and is classified in the Developer Files category, which contains 1166 files.
With the creation of the LESS Style Sheet (LESS), Alexis Sellier introduced file format along with programs built for their use.
LESS files are compatible with various operating systems, including Mac OS, Linux and Windows. You can open a LESS file using one of 3 programs, for example Visual Studio Code, Middleman and LESS.
Programs that support LESS files
How to open a LESS file?
The most common reason why a LESS file cannot be opened is the absence of required software. To fix this, select a compatible program from the list. Then visit the official developer website via the provided link, download the program, and install it on your system.
Visual Studio Code, Middleman and LESS are among the most widely used programs for handling LESS files. If you wish to install the latest release of Middleman, visit the official Thomas Reynolds portal and download the edition that works on any operating system.
Following installation, LESS files should be automatically opened with Middleman.
Set Middleman as the default LESS application
Change the default app that opens a file on Mac
- Right-click or use Control + Left-click on the desired LESS file to open a menu where you can choose from multiple actions;
- Choose "Open in Application" and click "Other";
- Look at the bottom of the window, where you will see the "Enable" menu. "Recommended Programs" will be selected as the default option;
- Within this menu select "All Programs" and navigate to Middleman. Check the box next to "Always open in app" to make sure it’s the default option.
Change default programs in Windows
- Start the process by right-clicking on your LESS file and selecting "Open With". From there, click "Choose another app" to continue;
- From the options listed in the pop-up window, specifically choose Middleman as the application to handle your LESS file;
- Be sure to check the "Always use this app" checkbox and click "OK" to save your preference.
Troubleshooting guide for LESS file complications
When issues arise with LESS files, they can generally be fixed with small software tweaks. Use the troubleshooting tips below to help resolve them.
What are the possible solutions to recover a corrupt LESS file?
Start a recovery program, open the damaged LESS file and then select the "Repair" menu item to start the repair procedure. Wait for the recovery process to finish, allowing automatic repair of damaged developer files.
How can I confirm if my LESS file has been damaged?
The signs of corrupted LESS developer files can manifest as:
- The file shows slow performance when edited in Visual Studio Code;
- The file stops responding or freezes in Middleman or other programs;
- The file does not respond or shows errors when opening it;
- Unexplained LESS file size inflation;
- The file operation is accompanied by the display of error messages;
What are the possible causes of Middleman crashing?
Lack of regular software updates can cause Middleman to crash. Make sure you have installed the latest updates for Thomas Reynolds products.
Restarting your computer is a crucial troubleshooting measure that can alleviate numerous common problems. Therefore, it is advisable to restart your computer before modifying any settings related to the software.
How to edit a LESS file?
To modify LESS files, it is necessary to install dedicated software that lets you open and edit developer files. Online LESS editors generally offer fewer tools compared to programs designed for LESS Style Sheet.
Best LESS Editor Software in 2026
Taking into account the provided details, we have prepared a list of LESS editors that match your needs.
| LESS Editor Software | Developer | Platforms | Overall Rating |
|---|---|---|---|
| Visual Studio Code | Microsoft | Windows, Mac OS, Linux | 4.7 out of 5 (38 reviews) |
| Middleman | Thomas Reynolds | Mac OS | 4.3 out of 5 (39 reviews) |