The Split — Activity file editor

What The Split does

The Split edits activity files on the web, with nothing to install and no account to create. Load a FIT, TCX or GPX file (up to 15 MB), choose what to do with it, and download the result. Your files are uploaded to our server, held in memory only while you work with them, and deleted automatically after a short period of inactivity.

What you can do

• Add heart-rate data from a chest or arm strap, such as a Polar Verity Sense, to a Garmin recording. Guide: Merging Garmin FIT files with Polar heart-rate data
• Merge two recordings of the same ride, such as a watch and an indoor trainer. Guide: Merge a watch recording with an indoor trainer ride
• Join two recordings made one after the other into a single activity. Guide: Merge two Garmin activities into one file
• Crop or split an activity by time or distance. Guide: Splitting, cropping, and joining activity files
• Fix a triathlon transition, or swap in a leg your watch missed. Guide: Fix wrong triathlon transitions on a Garmin watch

Who it is for

Athletes who record with a Garmin or another sports watch, bike computer or trainer app, and end up with files that do not match what they actually did.

Free to use. The Help page explains each tool in detail.