Guides & Tutorials
Step-by-step guides to merge GPX and FIT files, repair corrupted rides, trim or split activities, and fix Garmin, Wahoo and Strava uploads.
Merge files
FIT File Merger: Combine Garmin & Wahoo Files
Free FIT file combiner: merge multiple FIT files from Garmin, Wahoo and Coros into one activity with all sensor data preserved. Works offline.
tutorialMerge Garmin Activities: Step-by-Step
Garmin Connect can't merge two activities. Export both .FIT files, combine them in TrailBlender, check the totals and upload one ride. Free, offline.
Repair files
Try GPX Repair →GPX File Repair: Remove GPS Spikes, Trim Errors
Free GPX file repair for Garmin files: find and remove GPS spikes, trim bad data, export a clean GPX or FIT. Runs on your computer; limits explained.
scenarioGarmin Died Mid-Ride? Recover and Merge It
Yes, your Garmin saved the ride until it died. Find the .FIT file, recover it via Garmin Connect or USB, and merge it with your second recording.
tutorialFix GPS Drift in GPX and FIT Files: Remove Spikes
Fix GPS drift and position spikes in GPX and FIT files: detect the jumps, remove them, check your distance. Tunnel gaps are not filled.
Strava
Merge Strava Activities: Combine GPX Files
Strava can't merge two activities. Export both, merge GPX or FIT files in TrailBlender, upload one ride, delete the duplicates. Free, offline.
tutorialTrim Warmup & Cooldown from GPX Before Strava Upload
Trim warmup and cooldown from your GPX before uploading to Strava. Cut the start and end on a map, keep clean stats, export in minutes.
scenarioSplit a Strava Activity: Multi-Day Ride into Daily Rides
Split a Strava activity into daily rides. Strava's web split is manual; TrailBlender finds overnight pauses and writes one file per day.
tutorialHow to Trim a Strava Activity (Crop & Fix)
Trim or correct a Strava activity: use Strava's crop tool, learn what it can't fix, then trim the original file in TrailBlender and re-upload it.
Devices
How to Merge Garmin and Apple Watch Ride Data
Combine Garmin Edge power data with Apple Watch heart rate into one activity file. Step-by-step merge guide using TrailBlender — free and offline.
device-comboHow to Combine Power and Heart Rate Data from Two Devices
Merge power meter data from your head unit with heart rate from your watch into one file. Get complete training data in a single Strava activity.
device-comboHow to Merge Wahoo and Garmin Ride Data
Combine Wahoo ELEMNT and Garmin Edge ride data into one activity. Merge sensor channels from both devices for a complete Strava upload.