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.

Add cinematic black bars to any video. Choose popular aspect ratios like 2.35:1 Cinemascope or 21:9 ultrawide.

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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.