The Crop tool can be used to trim unwanted, inaccurate, or motor-assisted parts of an activity. Only activities with GPS data can be cropped, which excludes some indoor activities. Data cannot be cropped from the middle of an activity, only the start and/or end. Examples of when to use the Crop tool:
Trim any unwanted rest time at the start or end of an activity.
Cut out parts of an activity recorded in a car or that are motor-assisted at either the beginning or end of an activity.
Delete GPS location errors at the start or end of a ride.
How to use the Crop Tool
On the web, open the activity you'd like to crop and select the ellipsis icon. Select Crop from the menu.
Use the sliders to specify the portion you'd like to keep. You'll keep what's shown in orange and remove anything shown in blue on the map.
For small adjustments, use the Back and Forward buttons below each end of the slider. You can zoom in much further on the map by selecting Satellite view.
When you've made your selection, select Crop.
On the mobile app, open the activity you'd like to crop and select the ellipsis icon in the upper right corner. Select Crop from the menu options.
Use the sliders to specify the portion you'd like to keep. You'll keep what's shown in orange and remove anything shown in blue on iOS and grey on Android.
For small adjustments, use the arrow icons to adjust the start or end time one second at a time.
When you've made your selection, select Save.
What if the Crop Tool Can't Fix Your Problem?
Bad data in the middle of your activity: If, for example, the part of your activity driven in a car is in the middle of your ride, you won't be able to use the Crop tool to fix it. The only way to remove the middle section of an activity is to split it into two parts and then crop the middle section.
The whole activity was driven in a car: We recommend changing the activity type to something besides a "ride" or a "run" if the whole activity is motor-assisted. If you change the activity type, the data will no longer be eligible for activity-specific Segment Leaderboards. The most generic activity type for this is Workout.
If the activity with the bad data or car-driven portion isn't your own: Since you can only crop your own activities, if you come across someone else's bad data, you can flag the activity to remove all their times from the Segment Leaderboard.
Make a Mistake?
There's no way to "undo" cropping an activity, but you can re-upload the original version. This requires deleting any existing versions of that activity so the new version can be uploaded. Keep in mind this will remove all kudos, comments, and photos associated with the original activity.
From the activity page on the Strava website, select the ellipsis icon and choose Export Original. The original activity file will download to your computer.
Delete the incorrectly cropped activity.
Upload the original file here.