LanguageFIT
Garmin Training Center user activity profile
File type: Various data file
Files with fit extension can be usually found by users of Garmin Training Center. These are used for activity files that contain logged user's physical activity.
Found 2 different file type records with the same fit filename suffix.
What is fit file?
File type category:
Various data file
Date updated: November 9, 2023
File extension fit was also used for the default files of the Garmin Training Center, a tool for Windows and Mac OS X (macOS) that allows users to track and analyze their physical activity.
This type of fit file stores user's physical activity history (running, cycling, etc.) and locations. Files can be also uploaded to Garmin Connect Web on-line service.
Nowadays the data are synced automatically through the Garmin Connect app.
How to open fit file?
Use Garmin Training Center to open *.fit activity files.
How to convert fit file?
It may be possible to export .fit logs to TCX format for data exchange purposes.
Suggested software to open fit file:
Associated software actions with the fit file
Software applications that can open fit files:
Garmin Training Center (Microsoft Windows)
Garmin Training Center for Mac (Apple macOS / Mac OS X)
Software apps that create fit files:
Garmin Training Center (Microsoft Windows)
Garmin Training Center for Mac (Apple macOS / Mac OS X)
Software apps that import fit files:
FIT to TCX converter (On-line services)
Flexible Image Transport System
File type category:
Graphics file
Date updated: June 23, 2025
The fit file extension is used for Flexible Image Transport System format, a most commonly used standard format for images used in astronomy. Historically, magnetic tape was the original storage medium for FITS formats.
FITS is a digital file format used to store, transmit, and manipulate scientific and other images, specially in Astronomy. A major feature of the FITS format is that image metadata is stored in a human-readable ASCII header, so that an interested user can examine the headers to investigate a file of unknown provenance.
FITS is also often used to store non-image data, such as spectra, photon lists, data cubes, or even structured data such as multi-table databases. A FITS file may contain several extensions, and each of these may contain a data object. For example, it is possible to store x-ray and infrared exposures in the same file.
The most common suffix for this format however is the FITS file extension, sometimes there can be found this format with FTS file extension as well.
How to open fit file?
There are also some specialized FITS viewers that can open *.fit files.
Some image viewers such as GIMP, Photoshop, XnView and IrfanView can generally read simple *.fit images, however are not able to interpret more complex files.
How to convert fit file?
Specialized viewers AVIS - FITS Viewer can convert *.fit images to common bitmap files.
Suggested software to open fit file:
Associated software actions with the fit file
Software applications that can open fit files:
AVIS - FITS Viewer (Microsoft Windows)
Affinity Photo (Multiplatform)
Software capable of saving fit files:
AVIS - FITS Viewer (Microsoft Windows)
Programs for viewing fit files:
GDAL (Multiplatform)
XnView MP (Multiplatform)
Software apps that import fit files:
AVIS - FITS Viewer (Microsoft Windows)
PIPP (Microsoft Windows)
SAOImageDS9 (Microsoft Windows)
Affinity Photo (Multiplatform)
Software apps that export fit files:
AVIS - FITS Viewer (Microsoft Windows)
PIPP (Microsoft Windows)
NASA PDS4 Tools (Microsoft Windows)
Software apps that print fit files:
XnView MP (Multiplatform)