Repair Corrupted .FIT Files - Fix Header CRC & Recovery Errors
Strava rejecting your upload with "The upload appears to be malformed" or "File is empty"? Repair missing record counts and corrupted byte sequences.
How to Use Corrupted FIT Repair in 3 Simple Steps
Step 1: Upload
Drag & drop your .FIT, .GPX, or .TCX activity file. All processing is 100% private in your browser.
Step 2: Process
FitCrop inspects telemetry streams, removes anomalies, recalibrates metrics, or fixes binary checksums.
Step 3: Export
Download your clean Strava, Garmin, and Zwift compatible file with 1 click. Zero server wait.
Frequently Asked Questions
Why did my Garmin create a corrupt .FIT file?
If your watch runs out of battery before you save, or encounters a software crash, the file header remains open and the final CRC checksum is never written. FitCrop patches the header and writes the valid checksum.
Is this tool free compared to paid alternatives?
FitCrop is 100% free and open, with no subscriptions, file size limits, or paywalls.