TrailBlender
Turn fragmented Garmin, Wahoo & Apple Watch recordings into one clean activity file, ready for Strava.
No account · No subscription · Your data never leaves your computer
A desktop toolkit built for athletes who record with more than one device.
Combine GPX and FIT files from Garmin, Wahoo, Apple Watch, and Coros into one clean activity — preserving power, heart rate, cadence, and every sensor channel.
Trim warmup loops, cut GPS spikes, or split a long ride into separate Strava activities with precision.
Repair corrupted GPX files, recover lost ride data from a dead battery, fill GPS gaps, and smooth out anomalies automatically.
Power, heart rate, cadence, temperature — every sensor channel is preserved during merge. No more missing HR after combining files.
Garmin, Wahoo, Apple Watch, Coros, Suunto — merge data from any combination of GPS devices. Stop choosing which device's data to keep.
Output clean GPX or FIT files ready for Strava, Garmin Connect, Komoot, Wahoo, or Training Peaks.
Drag & drop GPX or FIT files from all your devices — head unit, watch, power meter, or phone.
TrailBlender auto-detects time overlaps, aligns sensor channels, and flags any GPS gaps or anomalies.
One click to merge into a single clean GPX or FIT file. Upload to Strava, Garmin Connect, or save locally.
Download TrailBlender free for macOS or Windows. No account required.
Requires macOS 12+ or Windows 10+ · ~25 MB · No account, no data uploaded to servers
Yes. The current TrailBlender utility is free to download and use without an account. TrailBlender is proprietary software.
TrailBlender reads and writes both GPX and FIT files. Import files from Garmin, Wahoo, Apple Watch, Coros, Suunto, or any device that exports standard GPS activity files. Learn more in our guide to merging FIT files.
Absolutely. TrailBlender is designed specifically for multi-device riders. It auto-detects time overlaps, aligns sensor channels, and merges data from any combination of GPS devices into one clean activity file. See our Garmin + Apple Watch merge guide for a step-by-step walkthrough.
No. TrailBlender is a desktop application that runs entirely on your computer. Your GPX and FIT files are never uploaded anywhere. All processing happens locally on your machine.
Open the file in TrailBlender and use the Fix & Repair tool. It can fill GPS gaps, smooth anomalies, and recover data from interrupted recordings. If you recorded the same ride on a second device, you can merge the two files to get a complete activity. Read our Garmin died mid-ride recovery guide for detailed steps.
GPX (GPS Exchange Format) is an open XML-based format supported by most platforms. FIT (Flexible and Interoperable Data Transfer) is Garmin's binary format that stores richer sensor data more efficiently. TrailBlender handles both formats and can convert between them.
Yes. Use the Trim & Split tool to cut warmup loops, cooldown segments, or any unwanted portion of your ride. Export the trimmed file and upload it directly to Strava, Garmin Connect, or any other platform. See our trim warmup guide for details.