Frequently Asked Questions
What is aspect ratio?
Aspect ratio is the proportional relationship between the width and height of an image, video, or screen. It is written as two numbers separated by a colon, such as 16:9. This means the width is 16 units for every 9 units of height.
How do I calculate aspect ratio?
Divide the width by the height to get the decimal ratio. For example, 1920 ÷ 1080 = 1.777..., which is 16:9. To express it as whole numbers, divide both dimensions by their greatest common factor (GCF). Our calculator does this automatically. Source:
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What is the 16:9 aspect ratio?
16:9 is the standard widescreen aspect ratio used for HD and 4K TVs, YouTube videos, and most modern monitors. Common resolutions include 1280×720, 1920×1080, 2560×1440, and 3840×2160.
What aspect ratio should I use for YouTube?
YouTube recommends a 16:9 aspect ratio for standard videos. The ideal resolution is 1920×1080 (1080p) or 3840×2160 (4K). For YouTube Shorts, use 9:16 (1080×1920).
What is the best aspect ratio for Instagram?
For Instagram posts, use 4:5 (1080×1350) for portrait, 1:1 (1080×1080) for square, or 1.91:1 (1080×566) for landscape. For Instagram Stories and Reels, use 9:16 (1080×1920).
What does 4:3 mean?
4:3 is the traditional standard-definition TV and computer monitor aspect ratio. It means the image is 4 units wide for every 3 units tall. Common resolutions include 640×480, 800×600, and 1024×768.
How do I resize an image without changing the aspect ratio?
Enter the original width and height, then enter either your desired new width or new height. Our calculator instantly computes the matching dimension to maintain the exact same proportions.
What is the difference between 2.35:1 and 2.39:1?
Both are ultra-wide cinema aspect ratios. 2.35:1 was the original anamorphic widescreen standard. Modern digital cinema uses 2.39:1 (sometimes rounded to 2.40:1) to accommodate digital projection systems. The difference is barely visible to viewers.
What is a 1:1 aspect ratio used for?
A 1:1 aspect ratio is a perfect square. It is commonly used for Instagram profile pictures, square photo prints, and some social media thumbnails. The most common resolution is 1080×1080 pixels.
How do I find the aspect ratio of my monitor?
Check your display settings for the native resolution, then divide width by height. For example, 2560 ÷ 1440 = 1.777..., which equals 16:9. You can also enter the resolution directly into our calculator to see the exact ratio.
What is pixel density and how does it relate to aspect ratio?
Pixel density (PPI or DPI) measures how many pixels fit in one inch. It is independent of aspect ratio. A 1920×1080 screen can be 24 inches or 55 inches — both are 16:9, but the pixel density differs. Use our
DPI Calculator for pixel density calculations.
Can I change the aspect ratio of a video?
Yes, but it requires re-encoding. You can crop the video to a new ratio (losing edge content), add black bars (letterboxing or pillarboxing), or stretch the image (which distorts it). Professional editors use software like DaVinci Resolve, Premiere Pro, or Final Cut Pro.