21:9 Aspect Ratio Calculator for Facebook video

Instructions

1. Enter the original width (W1) and height (H1).
2. Enter either the new width (W2) or new height (H2) to compute the other.
3. Change values at any time — use Reset to restore defaults.

Facebook Aspect Ratio Guide

Facebook supports a wide range of video formats across its different placements. Choosing the right aspect ratio is key to capturing audience attention and ensuring your video is displayed correctly.

Feed Videos

For videos that appear in the main Facebook feed, vertical formats perform best as they occupy more screen space on mobile devices.

• Recommended (4:5): A portrait aspect ratio like 4:5 is ideal for mobile viewing. A common resolution is 1080x1350 pixels.
• Square (1:1): Square videos (e.g., 1080x1080 pixels) are also highly effective and versatile.
• Landscape (16:9): While supported, horizontal videos take up less screen space and may be less engaging on mobile.

Facebook Stories & Reels (9:16)

Like Instagram, Facebook Stories and Reels are designed for a full-screen, vertical experience. The optimal aspect ratio is 9:16 with a resolution of 1080x1920 pixels.

Visual Aspect Ratio Examples

Additional Specifications

• Recommended Formats: MP4 or MOV.
• Max Video Length: Up to 240 minutes for feed videos (though shorter is better for engagement).
• Max File Size: Up to 4GB.

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The 21:9 aspect ratio, often marketed as "Ultrawide" or "CinemaScope," provides an expansive, cinematic viewing experience. It's popular for high-end gaming monitors and watching movies as the director intended.

What is the 21:9 Aspect Ratio?

The 21:9 aspect ratio (approximately 2.33:1) is significantly wider than the standard 16:9 widescreen format. It was originally developed for filming movies using an anamorphic lens to create a wider field of view. Today, it's the native aspect ratio of many ultrawide computer monitors.

Common resolutions for a 21:9 display include 2560x1080 and 3440x1440.

Why Use 21:9?

• Immersive Gaming: It offers a wider field of view in many games, increasing peripheral vision and immersion.
• Cinematic Movies: Most modern films are shot in an aspect ratio close to 21:9. Watching them on an ultrawide screen eliminates the black bars (letterboxing) seen on 16:9 displays.
• Productivity: The extra horizontal space is excellent for multitasking, allowing you to have multiple windows open side-by-side.

How 21:9 Interacts with Standard Displays

When you display a 21:9 video on a standard 16:9 screen (like a TV or a regular YouTube video), you will see black bars on the top and bottom. This effect is called letterboxing.

Frequently Asked Questions (FAQ)

Is 21:9 the same as 2.35:1?

They are very similar and often used interchangeably for marketing. Technically, 21:9 is a 2.33:1 ratio. CinemaScope is 2.35:1, and modern anamorphic formats are often 2.39:1 or 2.40:1. For most practical purposes, they all refer to the same "ultrawide" format.

Is 21:9 good for all games?

While many modern games support ultrawide resolutions, not all do. Some competitive games may restrict the field of view to maintain fairness, and older games may not support it at all, resulting in black bars on the sides (pillarboxing).

Will a 21:9 video have black bars on YouTube?

Yes, if viewed on a standard 16:9 monitor or TV. YouTube's player is 16:9, so it will add letterboxing (black bars on top and bottom) to fit the 21:9 content. However, if a viewer has a 21:9 monitor, they can often view the video in fullscreen to fill their entire display.