Calculate new dimensions while maintaining aspect ratios like "16:9" or "4:3".
Includes presets for YouTube thumbnails and social media posts.
A time-saving tool for designers and video editors.
* The preview is for ratio reference only. It does not reflect the actual pixel size.
The standard format for YouTube, modern TVs, and monitors. Common resolutions include 1920x1080 (Full HD) and 1280x720 (HD).
The classic ratio for analog TV and older computer monitors. It is still widely used in photography and some tablet devices.
The standard for mobile viewing. Used for TikTok, YouTube Shorts, and Instagram Reels (Vertical Video).
Header image sizes vary by platform. X (Twitter) uses a 3:1 ratio (1500x500px), while YouTube Channel Art requires 2560x1440px (16:9) to look great on all devices.
A. Digital images cannot have partial pixels. When creating your image, please round the number to the nearest integer.
A. It is approximately 1 : 1.618. It is a mathematical ratio often found in nature and is considered aesthetically pleasing in art and design.
Find the missing width or height for any ratio, or work out the ratio of an existing image.
An aspect ratio is simply width divided by height. To resize without stretching, keep that relationship the same:
Example: for a 16:9 video that needs to be 1,280 px wide, the height is 1,280 × 9 ÷ 16 = 720 px. To find the ratio of an existing image, divide both sides by their greatest common divisor. 1920 × 1080 divided by 120 becomes 16:9.
| Ratio | Common resolutions | Where it is used |
|---|---|---|
| 16:9 | 1280 × 720, 1920 × 1080, 2560 × 1440, 3840 × 2160 | YouTube videos and thumbnails, TVs, monitors, presentations |
| 9:16 | 1080 × 1920 | TikTok, Instagram Reels and Stories, YouTube Shorts |
| 4:3 | 1024 × 768, 1600 × 1200 | iPad screens, older TVs, many phone camera photos |
| 3:2 | 3000 × 2000, 6000 × 4000 | DSLR and mirrorless photos, 4 × 6 in prints |
| 1:1 | 1080 × 1080 | Square social posts, profile pictures, album art |
| 4:5 | 1080 × 1350 | Instagram portrait feed posts |
| 3:1 | 1500 × 500 | X (Twitter) header images |
| 21:9 | 2560 × 1080, 3440 × 1440 | Ultrawide monitors and cinematic video |
| 2.35:1 / 2.39:1 | 1920 × 817 | Widescreen cinema (CinemaScope) |
Once you know the size you need, you can resize your image, crop it to an exact ratio, or fit it onto a canvas without cropping.
Common 16:9 resolutions are 1280 × 720 (HD), 1920 × 1080 (Full HD), 2560 × 1440 (QHD), and 3840 × 2160 (4K UHD). Any width multiplied by 9 and divided by 16 gives a matching 16:9 height.
Divide the width and height by their greatest common divisor. For example, 1200 × 800 divided by 400 becomes 3:2. You can also divide width by height to get a decimal ratio, such as 1.5:1.
1080 × 1350 is 4:5, the portrait size Instagram recommends for feed posts.
Use 16:9 for regular videos and thumbnails (1920 × 1080 or 1280 × 720 for thumbnails), and 9:16 at 1080 × 1920 for YouTube Shorts.
16:10 is slightly taller than 16:9. It is common on laptops and MacBooks, such as 1920 × 1200 or 2560 × 1600, while 16:9 is the standard for TVs and video.
Calculating a new size does not change anything by itself. Quality only drops if you enlarge an image beyond its original pixels or stretch it to a different ratio. Cropping keeps the remaining pixels sharp.