FIT File Tools
A complete set of free, browser-based tools for working with Garmin FIT files. View, edit, crop, merge, convert, and repair activities. Your data never leaves your device — everything runs locally in your browser.
FIT File Viewer & Analyzer
Upload your .fit file to instantly view heart rate, power, cadence, elevation, and GPS data with interactive charts. Works with files from Garmin, Wahoo, Suunto, and all ANT+ devices.
Select FIT file →FIT File Editor
Trim, cap, and adjust your FIT file data without installing software. Fix erroneous spikes, remove warmup sections, or crop your activity to the exact segment you need.
Select FIT file →FIT File Converter
Convert your Garmin FIT files to GPX, TCX, or CSV in seconds. Select exactly which fields you need — GPS, heart rate, power, cadence, elevation, and more.
Select FIT file →FIT File Repair Tool
Got a corrupted FIT file? Upload it here and we'll diagnose the issues — timestamp gaps, GPS spikes, CRC errors — and fix them automatically. Your data stays in your browser.
Select FIT file →Combine FIT Files
Combine multiple FIT files into a single activity. Trim each file before stitching, drop overlapping segments, and download the merged result. Perfect for split recordings, multi-sport events, or sessions where your device stopped mid-activity.
Select FIT file →Crop FIT File
Upload your .FIT file, set start and end times with precise time inputs or quick presets, and download a clean cropped version in .FIT, GPX, or CSV format.
Select FIT file →What are FIT file tools?
FIT file tools are utilities for opening, editing, converting, and fixing the .fit activity files written by Garmin, Wahoo, Suunto, and Hammerhead devices. The FIT format is compact and complete — it records every heart rate sample, every GPS coordinate, every power and cadence reading, plus device metadata and lap structure. The catch is that it is a Garmin-flavored binary format that most apps cannot read directly. This is where FIT file tools come in: parse the file, show you what is inside, edit out the bits you do not want, convert to another format, or repair a file that got corrupted on the way off the watch.
Which FIT file tool do I need?
Pick the tool by what you want to do with the file:
- View the data — heart rate, power, GPS, lap splits → FIT File Viewer
- Trim a warmup, cap a spike, fix a timestamp → FIT File Editor
- Export to GPX, TCX, or CSV for use in Strava, Excel, TrainingPeaks, or mapping apps → FIT File Converter
- Fix a corrupted file Garmin Connect rejected → FIT File Repair Tool
- Combine multiple files from a split recording or multi-sport event → Combine FIT Files
- Crop unwanted time off the start or end → Crop FIT File
Why browser-based FIT file tools
Every tool on this page runs entirely in your browser. Your FIT file is parsed, transformed, and downloaded without ever touching a server — your activity data, GPS coordinates, and device IDs stay on your machine. That makes these FIT file tools safe to use with private data and fast (no upload step), and it means they work offline once the page has loaded.
FAQ
What is a FIT file?
FIT (Flexible and Interoperable Data Transfer) is a compact binary file format created by Garmin for storing activity data from GPS watches and bike computers. A FIT file contains every recorded sample — heart rate, power, cadence, GPS, elevation — plus device metadata and lap structure. It is the standard export format from Garmin, Wahoo, Suunto, Hammerhead, and most ANT+/Bluetooth fitness devices.
Do these FIT file tools work with Garmin, Wahoo, Suunto, and other brands?
Yes. Anything that writes the standard FIT format works here — Garmin watches (Forerunner, Fenix, Edge), Wahoo ELEMNT bike computers, Suunto watches, Hammerhead Karoo, Coros, Polar Vantage, and Amazfit/Zepp after FIT export. The tools also handle the older Garmin .fit variants from pre-2018 devices.
Can I use these FIT file tools offline?
Yes. Every FIT file tool on this hub runs entirely in your browser using JavaScript. After the page has loaded, you can disconnect from the internet and the tools continue working. Your file is never uploaded to a server.
Which platforms accept the exported files?
FIT files exported from our tools work with Garmin Connect, Strava, TrainingPeaks, intervals.icu, Wahoo SYSTM, and any platform that accepts standard FIT. The converter additionally outputs GPX (universally readable by mapping apps), TCX (training platforms like TrainingPeaks), and CSV (for Excel or Google Sheets analysis).