21:9 Aspect Ratio Calculator for Reels

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.

Instagram Aspect Ratio Guide

Choosing the right aspect ratio for your Instagram content is key to maximizing visual impact and engagement. Instagram supports several formats, each suited for different types of content.

Instagram Feed Posts (Photos & Videos)

For the main feed, you have a few options:

• Square (1:1): The classic Instagram format. Recommended resolution is 1080x1080 pixels. It's a safe bet that always looks good in the grid view.
• Portrait (4:5): This is often the best choice for engagement as it takes up more vertical screen space. The optimal resolution is 1080x1350 pixels.
• Landscape (1.91:1): Useful for wide shots. The recommended resolution is 1080x566 pixels. Content wider than 1.91:1 may be cropped.

Instagram Reels & Stories (9:16)

For full-screen, immersive content like Reels and Stories, the best aspect ratio is 9:16.

The recommended resolution is 1080x1920 pixels. This vertical format fills the entire mobile screen, capturing the viewer's full attention, which is ideal for short-form video.

Visual Aspect Ratio Examples

Video Length & File Specs

• Feed Videos: Up to 60 minutes.
• Reels: Up to 90 seconds.
• Stories: Up to 60 seconds per segment.
• Recommended Formats: MP4 and MOV.
• Max File Size: 4GB.

Why It Matters

Using the correct aspect ratio prevents Instagram from awkwardly cropping your content or adding black bars. Optimized images and videos look more professional and perform better on the platform.

Use Our Calculator

Need to resize a video or image for Instagram? Use our calculator to find the correct dimensions for any format.

Go to Instagram Aspect Ratio Calculator

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.