FIT vs GPX — which is better?

FIT files contain more data channels at higher resolution. Use FIT when available — it preserves heart rate, power, cadence, and temperature more reliably than GPX.

Which devices export FIT?

Garmin (Edge, Forerunner, Fenix), Wahoo ELEMNT, Hammerhead Karoo, Stages, and many ANT+ devices. Most modern cycling computers use FIT as their native format.

← All compatible devices

CyclingRacing

FIT Telemetry Overlay

Universal fitness data format from Garmin and ANT+

FIT (Flexible and Interoperable Data Transfer) is Garmin's binary format used by cycling computers, watches, and fitness devices. StintBox parses FIT files natively for rich overlay data.

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Supported Data Channels

GPS Position

Speed

Heart Rate

Power (watts)

Cadence

Altitude

Temperature

Gradient

How It Works

Export your FIT file

Download the .FIT file from Garmin Connect, Wahoo app, or copy it directly from your device.

Import into StintBox

Drag the FIT file into StintBox alongside your video. All data channels are auto-parsed.

Add performance widgets

Overlay heart rate zones, power graphs, cadence, speed, and a GPS track map.

Export your video

Render and share your overlay video on any platform.

Recommended Widgets

Heart Rate Zone

Power Meter

Cadence Arc

Speed Graph

Track Map

Altitude Profile

Temperature

Elapsed Timer

Frequently Asked Questions

Ready to overlay your data?

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