# Sync your FIT with your video

> Sync is the heart of the overlay: every frame must show the data of the exact second. override.studio proposes an automatic offset and lets you fine-tune it by hand.

Canonical: https://override-studio.pages.dev/en/guides/sync-fit-with-video/

## How the offset works

Each clip has an offset in seconds that shifts telemetry relative to the video. If your video started 90 seconds into the activity, the offset is +90 s.
The Auto button computes that offset by subtracting the FIT start from the video recording date. That is why the file date and time zone matter: with the wrong zone, the offset is born hours off.

## Before you start

Load the FIT first: without an activity there is nothing to sync against. Check the clip carries a recording date (the Clip panel shows it); without one, you must place the clip by hand over the activity view.
If your video is iPhone HEVC, convert it to H.264 first: Chrome cannot decode it.

## Steps

1. **Load the FIT.** Drag your .FIT onto the activity area or click to pick it. You will see the summary (duration, distance, samples) and the activity chart.
2. **Add the clip.** Add your MP4 or MOV. The Clip panel shows its recording time and the time zone used to interpret it.
3. **Set the time zone.** Pick the zone where you recorded. The app applies it per clip: travelling with the camera in another zone does not break the rest.
4. **Press Auto.** The Auto button computes the offset from the video date and the FIT start. The status line shows the math (video − FIT) so you can verify it.
5. **Nudge by hand.** With the clip selected, use ← / → to move 0.1 s (0.5 s with Shift) until a visible effort —a sprint, a corner— matches the data.
6. **Check the preview.** Play the clip with the template on: numbers must move with the video. Repeat per clip; each keeps its own offset.

## Tips

- Without a recording date, drag over the activity view to place the clip by eye, then nudge with the arrows.
- A recognizable sprint or climb is the best landmark for fine-tuning.
- The time zone has no effect when the clip has no date: the app tells you.

[← https://override-studio.pages.dev/en/](https://override-studio.pages.dev/en/) · [Open the app](https://override-studio.pages.dev/)