Strava Upload Error Code Decoder - Diagnose & Fix Common Upload Failures
Identify why your activity won't sync to Strava or Garmin Connect and get the step-by-step resolution.
How to Use Strava Error Decoder 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
How to fix "The upload appears to be malformed"?
Load your file into FitCrop's Corrupted FIT Repair tab. It checks and corrects the binary header length and recalculates the trailing CRC-16 checksum.
How to fix "Duplicate of an existing activity"?
Strava rejects uploads with matching start timestamps. FitCrop allows shifting the timestamp by 1 second or trimming overlapping points so Strava accepts it as a unique workout.