How to Crop a FIT File: Remove Warm-Up & Cool-Down from Garmin Workouts
Learn how to crop or trim a FIT file to remove warm-up, cool-down, or unwanted portions from your Garmin activity. Free online tool with step-by-step instructions.
How do you crop a FIT file? Open your file in our free FIT File Editor, use the trim slider to select the portion you want to keep, then download the cropped file. The editor removes unwanted start and end sections while preserving all your workout metrics.
Cropping (also called trimming) a FIT file lets you remove portions of your recorded activity without affecting the rest of your data. This is one of the most common edits athletes make to their workout files.
When to Crop a FIT File
There are many situations where trimming your activity file makes sense:
Before the Workout
- Early start: You pressed record while still setting up
- GPS lock delay: The first minutes show erratic GPS data
- Waiting at start line: Race recording started before the gun
- Walking to start: Your warm-up walk is included in the run
After the Workout
- Late stop: You forgot to stop recording after finishing
- Cool-down included: Your easy walk home is in the activity
- Post-race wandering: Walking around after crossing the finish line
- Device delay: It took a moment to stop the recording
Privacy Concerns
- Home location visible: Start/end points reveal where you live
- Work location shown: Regular routes from office are tracked
- Sensitive locations: Need to hide specific waypoints
Step-by-Step: How to Crop a FIT File
Step 1: Get Your FIT File
From Garmin Connect:
- Log into connect.garmin.com
- Open the activity you want to crop
- Click the gear icon (⚙️) in the top right
- Select "Export Original" to download the .fit file
From Your Device:
- Connect your Garmin via USB
- Navigate to:
Garmin > Activities - Copy the .fit file to your computer
From Other Platforms:
- Wahoo: Export from the Wahoo app
- COROS: Export from COROS app or website
- Suunto: Export from Suunto app
Step 2: Upload to the FIT File Editor
- Go to the FIT File Editor
- Drag and drop your FIT file onto the upload area
- Or click to browse and select your file
- Wait for the file to load (instant, local processing)
Step 3: Use the Trim Controls
Once your file loads, find the Trim Activity section:
- Slider method: Drag the start and end handles on the slider
- Number input: Enter specific record numbers for precision
- Time display: See the exact time being trimmed
The controls show you:
- Start and end record numbers
- Corresponding timestamps
- Total records after trimming
Step 4: Verify Your Trim
Check the After Trim preview showing:
| Metric | What It Shows |
|---|---|
| Records | Number of data points remaining |
| Duration | New activity length |
| Distance | Updated total distance |
| Trimmed | Percentage of original removed |
| Time Range | New start and end times |
The map and chart previews also update in real-time, so you can visually confirm your trim points.
Step 5: Download the Cropped File
- Click "Download Edited FIT"
- The file downloads with "_edited" appended to the name
- Your original file remains unchanged
What Happens When You Crop a FIT File?
Understanding what cropping affects helps you make better editing decisions:
Data That's Recalculated
| Data Field | How It Changes |
|---|---|
| Total Distance | Recalculated from remaining records |
| Total Time | Updated to reflect trimmed duration |
| Start Time | Changed to first remaining record |
| End Time | Changed to last remaining record |
| Lap Data | Laps within trim range are preserved |
Data That's Preserved
| Data Field | Status |
|---|---|
| Per-second records | Kept for remaining portion |
| GPS coordinates | Unchanged for kept records |
| Heart rate data | Preserved as recorded |
| Power/cadence | Maintained in kept section |
| Device information | Copied to new file |
Data That May Change
| Data Field | Impact |
|---|---|
| Averages | Recalculated from remaining data |
| Max values | May change if max was in trimmed section |
| Calories | Adjusted for shorter duration |
| Training effect | May be recalculated by platforms |
Cropping for Privacy
Many athletes crop activities to protect their privacy. Here's how to hide your location:
Hiding Your Home
If your runs start from home:
- Crop the first 2-5 minutes of the activity
- Or crop until you're at least 500m from your starting point
- The remaining track won't reveal your exact address
Creating Privacy Zones
While cropping helps, consider these additional steps:
- Many platforms offer "privacy zones" to hide start/end areas
- You can crop both start AND end to hide return routes
- For out-and-back routes, trimming the turnaround area helps too
Common Cropping Scenarios
Scenario 1: Remove GPS Lock Delay
Problem: First 30 seconds show GPS jumping around.
Solution:
- Look at the map preview to find where GPS stabilizes
- Move the start trim point past the erratic section
- Usually 10-30 seconds is enough
Scenario 2: Cut Warm-Up from Race
Problem: Race recording includes 15-minute warm-up jog.
Solution:
- Find the record number where the race actually started
- Use the time display to identify the exact moment
- Set trim start to that record
- Your race-only time and pace will be accurate
Scenario 3: Remove Post-Workout Walk
Problem: Activity includes walking to your car after the run.
Solution:
- Look at the speed chart for the sudden drop
- Move the end trim point to before the walking began
- Check the distance to ensure it matches your workout
Scenario 4: Extract One Segment from Long Activity
Problem: 3-hour ride includes a 30-minute segment you want to analyze separately.
Solution:
- Trim both start and end
- Set start trim to the beginning of the segment
- Set end trim to the end of the segment
- Download the extracted portion
Tips for Better Cropping
Use the Time Display
The trim controls show timestamps for each point. This helps you:
- Find exact moments (like the race gun)
- Verify you're keeping the right portion
- Match to your memory of the activity
Check the Preview
Before downloading:
- Look at the map to verify start/end points
- Check the chart to see included data
- Review the "After Trim" statistics
Keep Your Original
Always keep the unedited FIT file:
- Store originals in a dedicated folder
- Never overwrite the source file
- You can re-crop differently if needed
Consider Precision
For races and important workouts:
- Zoom in on the data by adjusting one record at a time
- Use the exact record number input for precision
- Match to official timing chips if available
Privacy Benefits of Browser-Based Editing
Our FIT File Editor processes everything locally:
| Privacy Feature | Benefit |
|---|---|
| No upload | Files stay on your computer |
| No account | No personal data collected |
| No storage | Nothing saved to servers |
| Instant | No waiting for server processing |
This is especially important when editing files that contain your home location or regular routes.
After Cropping: Next Steps
Once you have your cropped FIT file:
Upload to Platforms
- Garmin Connect: Upload the edited file to replace or add activity
- Strava: Upload directly or sync from Garmin
- TrainingPeaks: Import for training analysis
Further Editing
If you need additional changes, check out:
- How to Edit FIT Files - Complete editing guide
- Fix GPS Drift - Correct shifted tracks
- Change Activity Type - Fix wrong sport
Convert to Other Formats
- FIT to GPX Converter - For sharing routes
- FIT to CSV Converter - For spreadsheet analysis
Frequently Asked Questions
Can I crop a FIT file without special software?
Yes! Our free online FIT File Editor works in any modern browser. No software installation needed.
Will cropping affect my Garmin Connect records?
Only if you upload the cropped file. Your original activity in Garmin Connect remains unchanged unless you delete and replace it.
Can I undo a crop after downloading?
Not from the cropped file—that's why we recommend keeping your original. You can always re-crop from the original file with different trim points.
Does cropping work for indoor activities?
Yes. Even without GPS data, you can trim based on time, distance, heart rate, or other metrics.
How much should I crop for privacy?
Most experts recommend removing at least 200-500 meters from your start and end points to prevent location identification. The exact amount depends on your neighborhood density.
Related Resources
- Complete Guide to Garmin FIT Files - Understanding FIT format
- 5 Common FIT File Problems - Troubleshooting guide
- FIT File Viewer - Analyze your activity data