What is letterboxing?

Letterboxing adds horizontal bars to the top and bottom of a video to simulate a wider cinematic aspect ratio, like 2.35:1 used in movies.

What aspect ratio should I use?

2.35:1 (Cinemascope) is the most common cinematic ratio. 2.39:1 is used in modern Hollywood films. 21:9 matches ultrawide monitors.

No. The bars are drawn over the existing frame, keeping the original resolution. The visible image area within the bars has the cinematic ratio.

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What is letterboxing?: Letterboxing adds horizontal bars to the top and bottom of a video to simulate a wider cinematic aspect ratio, like 2.35:1 used in movies.
What aspect ratio should I use?: 2.35:1 (Cinemascope) is the most common cinematic ratio. 2.39:1 is used in modern Hollywood films. 21:9 matches ultrawide monitors.
Will this change my video resolution?: No. The bars are drawn over the existing frame, keeping the original resolution. The visible image area within the bars has the cinematic ratio.