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FIT File Editor

Trim, cap, and adjust your FIT file data without installing software. Fix erroneous spikes, remove warmup sections, or crop your activity to the exact segment you need.

Drag & drop your FIT files here

or click to browse — max 50 MB

Processed in your browser. Your file never leaves your device.

FAQ

Can I edit a FIT file without losing data?

Yes. This editor lets you trim, cap, and scale values while preserving all other data in the file. You can preview changes before exporting and use undo/redo to revert any edits.

How do I remove a warmup or cooldown from my FIT file?

Use the trim feature to set new start and end points. Drag the sliders on the activity timeline or enter exact timestamps. The trimmed file will contain only the data between your selected points.

How do I fix heart rate spikes in my FIT file?

Use the "Cap heart rate" feature to set a maximum value. Any readings above your cap will be clamped. This is useful for removing erroneous spikes caused by sensor dropouts or interference.

Related FIT Tools

FIT File Viewer Inspect your file's data, charts, and laps before making edits. FIT File Converter Convert your edited file to GPX, TCX, or CSV for other platforms.