Rotate or flip a video

Fix a sideways or upside-down phone recording: rotate 90° left or right, turn it 180°, or mirror it horizontally or vertically.

My phone video plays sideways — which option do I need?

If the video leans left (top points left), choose "Rotate 90° right"; if it leans right, choose "Rotate 90° left". Upside down is "Rotate 180°".

Does rotating re-encode the video?

Yes — the pixels are actually rotated and re-encoded so the result plays correctly everywhere, including players that ignore rotation metadata.