FIT File Viewer & Editor
View and crop FIT files from cycling, running, walking and hiking. Explore your activity, select laps or a time range, and download the section you want. Free, no account required.
Choose an original .fit activity file, up to 10 MB. Files are uploaded to our server for this session and are not saved to your account.
demo-interval-ride.fit
Start time: 2026-01-01 09:00:00 | Elapsed: 00:25:00 | Active time: 00:24:00 | Distance: 10.85 km
Activity Chart
Toggle data series to show or hide them. Zoom or pan to update the section selected for cropping.
Route Map
Hover on the chart above to see your position on the map
Laps
Check laps to choose a continuous section. Selecting a lap farther away also includes the laps between. Uncheck an end lap to shorten the range; middle laps stay selected.
Whole activity selected. Check a lap to start a lap selection.
| Lap | Recorded section | Elapsed | Active time | Distance | Avg power | Avg heart rate | Avg cadence |
|---|---|---|---|---|---|---|---|
| 00:00:00 – 00:05:00 | 00:05:00 | 00:05:00 | 1.97 km | 152 W | 128 bpm | 82 rpm | |
| 00:05:00 – 00:10:00 | 00:05:00 | 00:05:00 | 2.69 km | 284 W | 158 bpm | 94 rpm | |
| 00:10:00 – 00:13:00 | 00:03:00 | 00:02:00 | 0.78 km | 120 W | 128 bpm | 81 rpm | |
| 00:13:00 – 00:18:00 | 00:05:00 | 00:05:00 | 2.68 km | 287 W | 158 bpm | 94 rpm | |
| 00:18:00 – 00:25:00 | 00:07:00 | 00:07:00 | 2.74 km | 124 W | 128 bpm | 82 rpm |
Activity statistics
Averages account for time between readings and exclude pauses. Zero readings count; missing readings do not. Average speed uses distance divided by active time when distance is available. Exported summaries use the same calculations.
| Metric | Avg | Max | Min |
|---|---|---|---|
| Heart rate (bpm) | 141 | 163 | 111 |
| Power (W) | 197 | 303 | 0 |
| Cadence (rpm) | 87 | 97 | 0 |
| Speed (km/h) | 27.1 | 33.8 | 0.0 |
| Altitude (m) | 299 | 320 | 280 |
Crop your activity
Keep your selected laps or time range, or enter elapsed start and end times below. Review the selection before downloading. Only records within your selection are exported.
Selected duration: 00:25:00 · Active time: 00:24:00 · 10.85 km
Recorded section: 00:00:00 to 00:25:00. Boundaries snap to available recorded points.
Exports keep recorded sensor data. Some device-specific summary metrics are not included.
What Are FIT Files?
FIT (Flexible and Interoperable Data Transfer) stores activity data from sports watches, cycling computers and other fitness devices. Available data can include timestamps, GPS coordinates, heart rate, power, cadence, speed and altitude. The channels you see here depend on what your device recorded.
This viewer reads your uploaded .fit file on our server and plots the available data channels on an interactive chart. You can toggle individual series on and off - for example, show only power and heart rate to spot cardiac drift, or isolate cadence to check pedaling consistency. The summary statistics update to match the channels and time range you have selected. Cadence is shown in rpm.
Where do I find my FIT file?
Export the original activity file from your recording platform, or copy it from your watch or cycling computer. If the export comes in a ZIP archive, extract the .fit file before uploading it here.
How to crop a FIT file
- Upload your FIT activity, or try the demo.
- Select consecutive laps or zoom into the chart to choose the section you want to keep.
- Use the Crop your activity controls below the statistics, or select Crop activity beside the upload button to scroll to them. Adjust the start and end times if needed, and review the selected duration and distance.
- Choose Download cropped FIT to save that section as a separate activity. Reset selection restores the full recording.
Cropping supports single-session activities with timestamped readings, including cycling, running, walking, hiking and rowing. Swimming, multisport activities, and activities organized by lengths or sets are not supported for cropping yet.
Your uploaded file and chart data are held temporarily on our server for your session. Activity files are not saved to your account. Download the result to keep a copy; the original file on your device is unchanged.