TrailBlender

Bring your activity files together.

TrailBlender helps you combine separate recordings, tidy up GPS tracks, and prepare an activity for export. Import GPX files and FIT activities with GPS data, inspect the route on a map, and review the available sensor channels.

MERGE YOUR RECORDINGS Combine tracks from different recordings. Preview the result before creating your merged activity.

EDIT AND REPAIR Trim, crop, or split a track. Detect and remove GPS spikes, edit activity metadata, and adjust timestamps. Undo and redo let you review your changes as you work.

KEEP YOUR SENSOR DATA Retain supported heart-rate, cadence, power, elevation, speed, and temperature values at the points that remain in your edited track.

EXPORT GPX OR FIT Save your edited activity as GPX or FIT. Convert between the supported formats using the Export menu.

WORK ON YOUR MAC Activity files are processed locally, with no account required. Optional product analytics are off by default. Online terrain and street maps load tiles from external providers, which receive your IP address and the requested map area independently of analytics consent.

Available in English, German, French, and Spanish.

FORMAT DETAILS FIT import requires GPS records. FIT export requires valid, chronological timestamps on every point. Export creates new activity summaries; original FIT laps and custom developer fields are not preserved.

Requires macOS 12 Monterey or newer with current Safari updates (Safari 16.4 or newer).

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