Convert Garmin activity files (FIT) online for free
The converter easily converts your FIT activity files to various formats - free and online. No Garmin Connect or or other Data software needed.
To convert other file formats to the "Fitness GPS & Activity File" file type, you need software like Garmin Connect or a similar tool.
The .FIT (Flexible and Interoperable Data Transfer) file is a proprietary binary format created by Garmin. It records high-resolution fitness activity data, including GPS coordinates, heart rate, cycling cadence, power meter wattage, and timestamps. These files are typically generated by modern GPS smartwatches, cycling computers, and indoor trainers. Users commonly upload them to fitness platforms like Garmin Connect, Strava, or TrainingPeaks to visualize their workouts.
However, .FIT files have a major disadvantage: they are compiled binary files. Unlike text-based formats, you cannot open a .FIT file in a standard text editor to fix a glitchy GPS point or delete a corrupted power spike. If your device crashes or the battery dies during a long marathon, the resulting .FIT file often corrupts, leaving your data locked and unreadable without specialized developer tools. Furthermore, many generic mapping applications do not support this proprietary format.
To manually edit, analyze, or map your workout data, you must convert the file. For broad compatibility with standard mapping software like Google Earth, convert to GPX (GPS Exchange Format). If you need to preserve detailed lap metrics and heart rate data in a widely accepted XML structure, convert to TCX (Training Center XML). To analyze your power output graphs mathematically, convert to CSV and open it in Microsoft Excel.
Secondary Use Case: A small percentage of .FIT files are actually FITS (Flexible Image Transport System) files. These are large, uncompressed scientific image arrays used by NASA and astronomical observatories. Because web browsers and standard image viewers cannot read multi-dimensional astronomical data, you must convert these files to PNG or JPG for web sharing, or to TIFF for archiving.
Use Convert.Guru to open and convert your FIT file.
Users also converted TCX, CSV, GPX, FITS, ZIP, GZ, ERG, PROD-1, 1200-FIT, TXT, MRC, KML and XLSX files.
If you want to convert FIT file to GPX, MTR, TCX, KML, SHP, KMZ, GEOJSON, TOPOJSON, TIF or TIFF, you can use Garmin Connect or similar software from the "Fitness Activity Data Storage" category. In the File menu, look for Save As… or Export….
To convert LAZ, KMZ, DTM, CSV, DEM, PRJ, LAS, GPX, DSM, SHP, DBF or KML files to FIT, try Garmin Connect or another comparable tool in the "Fitness Activity Data Storage" category.
The history of Convert.Guru began over 25 years ago in California with Tom Simondi’s file-format database. A former contributor to Space Shuttle development and a software pioneer of the 1980s, Simondi established a trusted resource for file type analysis that was even referenced by Microsoft Windows XP. Today, we use modern technology to process and convert thousands of file formats while continually improving our FIT converter.