YouTube Aspect Ratio Calculator
Use this YouTube aspect ratio calculator to prepare standard videos, Shorts, thumbnails and channel artwork. Standard YouTube videos and thumbnails use 16:9, while Shorts use the vertical 9:16 format. Pick the placement first, then calculate the matching dimensions before exporting.
YouTube calculator
YouTube sizes by placement
| Size / ratio | Label | Use-case |
|---|---|---|
| 1920×1080 | 16:9 | Standard Full HD YouTube video |
| 3840×2160 | 16:9 | 4K UHD YouTube video |
| 1280×720 | 16:9 | YouTube thumbnail |
| 1080×1920 | 9:16 | YouTube Shorts |
| 2560×1440 | 16:9 canvas | Channel banner, with center safe area |
YouTube formulas
For standard video: height = width × 9 ÷ 16For Shorts: height = width × 16 ÷ 9For thumbnail: keep 1280×720 unless you need a larger same-ratio source.
Worked example. You have a 1600 px-wide clip and want it in standard 16:9. Height = 1600 × 9 ÷ 16 = 900 px. Cutting that footage into a Short instead flips the math: for a 1080 px-wide vertical frame, height = 1080 × 16 ÷ 9 = 1920 px. A 1280 px-wide thumbnail stays at 1280 × 720 (also 16:9), so it lines up with the video player and the search preview.
Choosing between videos and Shorts
YouTube has two main shape families. Standard videos use 16:9 because the player is widescreen. Shorts use 9:16 because they are designed for full-screen mobile viewing. Thumbnails also use 16:9 so they align with the video player and search result previews.
If you upload a mismatched ratio, YouTube can still process the file, but it may add black bars or show the content smaller than expected. For a clean result, edit standard videos in 16:9 and vertical Shorts in 9:16 from the start.
Think of YouTube as three practical jobs. The first is standard video export, where 16:9 is the default and 1920×1080 is the safe baseline. The second is thumbnail design, where 1280×720 is the normal canvas and text must remain readable at small preview sizes. The third is Shorts, where the correct shape changes to 9:16 and 1080×1920 becomes the better default.
That distinction prevents a common mistake: assuming every YouTube asset uses the same size. You can film a standard video in 16:9, cut a Short in 9:16, and design a thumbnail in 16:9 for the same upload. For the widescreen math use the 16:9 aspect ratio calculator; for Shorts use the 9:16 aspect ratio calculator.
Channel banner safe area
The channel banner (also called channel art) is the one YouTube asset that behaves differently. You upload a single 2560×1440 canvas, but YouTube crops it per device — a TV shows almost the whole image, a desktop shows a wide strip, and a phone shows even less. To keep your logo and text visible everywhere, keep the important content inside the central 1546×423 safe area. Anything outside that box can be cropped on smaller screens, so treat the edges as decorative bleed. Keep the file under 6 MB.
| Region | Size | What shows there |
|---|---|---|
| Full upload canvas | 2560×1440 | 16:9 file you actually upload |
| TV display | 2560×1440 | Whole image is visible |
| Desktop visible strip | 2560×423 | Full width, cropped top and bottom |
| Safe area (all devices) | 1546×423 | Logo and text belong here |
Thumbnails that stay legible
A thumbnail is 1280×720 (16:9), must be at least 1280 px wide, and should stay under 2 MB as a JPG, PNG or GIF. The catch is that viewers rarely see it at full size — in the sidebar, on mobile search and on a watch history row it can shrink below 250 px wide. Design for the small version: use two or three large words, high contrast, and keep faces and text away from the outer edges, where the duration badge and the progress bar sit at the bottom-right and bottom of the frame. If text is still readable when you scale the 1280×720 image down to roughly a quarter of its size, it will survive real placements.
How YouTube video, Shorts and banner shapes compare
The three shapes are genuinely different, which is why one export size never covers everything. The 16:9 video is a moderate landscape rectangle; the 9:16 Short is its mirror image, tall and narrow for full-screen phones; and the banner safe area is a long, thin strip much wider than a normal video because it has to fit inside a header that gets cropped on every device. Match your export to the shape the placement expects, then pick the resolution — use the 16:9 calculator for video and thumbnails and the 9:16 calculator for Shorts.
Frequently asked questions
Related calculators and guides
- Aspect ratio calculator — the main calculator with custom ratios
- 16:9 aspect ratio calculator — widescreen video and thumbnail math
- 9:16 aspect ratio calculator — vertical math for Shorts
- Social media image sizes — recommended dimensions per platform
- Aspect ratio vs. resolution — why 1080p and 4K share one shape