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Here's a Python library to parse ANT/Garmin .FIT files. Build Status

Install from PyPI:

pip install fitparse

FIT files

  • FIT files contain data stored in a binary file format.
  • The FIT (Flexible and Interoperable Data Transfer) file protocol is specified by ANT.
  • The SDK, code examples, and detailed documentation can be found in the ANT FIT SDK.


A simple example of printing records from a fit file:

import fitparse

# Load the FIT file
fitfile = fitparse.FitFile("")

# Iterate over all messages of type "record"
# (other types include "device_info", "file_creator", "event", etc)
for record in fitfile.get_messages("record"):

    # Records can contain multiple pieces of data (ex: timestamp, latitude, longitude, etc)
    for data in record:

        # Print the name and value of the data (and the units if it has any)
        if data.units:
            print(" * {}: {} ({})".format(, data.value, data.units))
            print(" * {}: {}".format(, data.value))


The library also provides a fitdump script for command line usage:

$ fitdump --help
usage: fitdump [-h] [-v] [-o OUTPUT] [-t {readable,json}] [-n NAME] [--ignore-crc] FITFILE

Dump .FIT files to various formats

positional arguments:
  FITFILE               Input .FIT file (Use - for stdin)

optional arguments:
  -h, --help            show this help message and exit
  -v, --verbose
  -o OUTPUT, --output OUTPUT
                        File to output data into (defaults to stdout)
  -t {readable,json}, --type {readable,json}
                        File type to output. (DEFAULT: readable)
  -n NAME, --name NAME  Message name (or number) to filter
  --ignore-crc          Some devices can write invalid crc's, ignore these.

See the documentation for more:

Major Changes From Original Version

After a few years of laying dormant we are back to active development! The old version is archived as v1-archive.

  • New, hopefully cleaner public API with a clear division between accessible and internal parts. (Still unstable and partially complete.)

  • Proper documentation! Available here.

  • Unit tests and example programs.

  • (WIP) Command line tools (eg a .FIT to .CSV converter).

  • Component fields and compressed timestamp headers now supported and not just an afterthought. Closes issues #6 and #7.

  • FIT file parsing is generic enough to support all types. Going to have specific FitFile subclasses for more popular file types like activities.

  • (WIP) Converting field types to normalized values (for example, bool, date_time, etc) done in a consistent way, that's easy to customize by subclassing the converter class. I'm going to use something like the Django form-style convert_<field name> idiom on this class.

  • The FIT profile is its own complete python module, rather than using profile.def.

    • Bonus! The profile generation script is less ugly (but still an atrocity) and supports every ANT FIT SDK from version 1.00 up to 5.10.
  • A working module. Closes issue #2, finally! I'll upload the package to PyPI when it's done.

  • Support for parsing one record at a time. This can be done using <FitFile>.parse_one() for now, but I'm not sure of the exact implementation yet.

Updating to new FIT SDK versions

python3 scripts/ /path/to/ fitparse/


This project is licensed under the MIT License - see the LICENSE file for details.

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