FIT File Extension
Flexible Image Transport System Format
- File Type fit
- Developer Garmin
- Popularity
- Application Garmin Training Center
- Category Data Files
- Format Binary
What is a FIT file?
The FIT file extension is linked to Flexible Image Transport System Format and belongs to the Data Files category, which includes 6196 files.
The Flexible Image Transport System Format (FIT), created by Garmin, is one of file format they developed, and they also built 7 programs to support them.
FIT files are supported by Windows and Mac OS. When working with FIT files, you can rely on 2 programs, including Garmin Training Center and FIT to TCX converter.
Programs that support FIT files
How to open a FIT file?
If you can’t open a FIT file, it is usually because the necessary software is missing. To resolve the issue, select the right program from the list for your operating system. Then go to the official website of the developer, download the software, and install it.
The most popular programs for working with FIT files are Garmin Training Center and FIT to TCX converter. To install the latest version of Garmin Training Center on your computer, visit the Garmin website where you can download the version available for all operating systems.
Following installation, FIT files should be automatically opened with Garmin Training Center.
Set Garmin Training Center as your default FIT viewer
Changing the default program in Windows
- Right-click on your FIT file, then choose the "Open with" option and select "Choose another application" from the available options;
- From the list of applications in the pop-up window, find and select Garmin Training Center as your desired application;
- Check the "Always use this app" checkbox, and then click "OK" to set your chosen app as the default for opening FIT files.
Set default app to open files on Mac
- Right-click or Control + left-click on the desired FIT file to open a menu of available actions;
- Select "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 Garmin Training Center. Check the box next to "Always open in app" to make sure it’s the default option.
Convert to and from FIT
If you have trouble working with a FIT file, try converting it to JPEG, GIF, BMP, FITS, TCX or similar data files.
Please note that after converting a FIT file, some functionality may differ from the original. However, in many cases, it can be converted back to its original format.
Convert FIT to other file formats
Solving Common FIT File Challenges
When issues arise with FIT files, they can generally be fixed with small software tweaks. Use the troubleshooting tips below to help resolve them.
What are the warning signs that my FIT file may be corrupted?
Corrupted FIT data files may have one or more of the following symptoms:
- Error messages appear during the course of working with the file;
- Poor performance when editing a file in Garmin Training Center;
- Attempts to open the file result in errors or failed results;
- Unexplained increase in FIT file size;
- The file causes Garmin Training Center or other programs to hang or crash during operation;
Why does Garmin Training Center crash?
Garmin Training Center crashes can be caused by outdated software. Keep your Garmin products up to date by installing the latest updates.
A simple restart of your computer can often fix many common problems, which is why it is the recommended first step before making any adjustments to your software settings.
How to repair a corrupted FIT file?
Use a data recovery program to open the damaged FIT file and from the menu choose "Repair" function to start the repair process. Please be patient while the recovery process completes, which will automatically restore the damaged data files.
How to edit a FIT file?
To edit FIT files, you need to install specialized software that allows you not only to open but also to modify data files. Online FIT editors usually provide fewer features than software created specifically for Flexible Image Transport System Format.
Best FIT editors in 2026
Taking into account the provided details, we have prepared a list of FIT editors that match your needs.
| FIT Editor Software | Developer | Platforms | Overall Rating |
|---|---|---|---|
| Garmin Training Center | Garmin | Windows, Mac OS | 4.9 out of 5 (39 reviews) |