16:9 Resolution

A 16:9 resolution is any pixel size whose width is exactly 16/9 of its height, so 1280 × 720, 1920 × 1080, 2560 × 1440, 2880 × 1620, 3840 × 2160 and 7680 × 4320 all qualify. Our spec library entry for the shape lists 21 exact sizes, explains 3K, gives the 4:3 crop math and separates YouTube thumbnails (16:9) from Shorts (9:16). The 1080p story lives on the 1920x1080 aspect ratio sheet; this page owns the ladder.

What 16:9 resolution means, and the one test that settles it

A size is exactly 16:9 when width × 9 equals height × 16, which is the same as saying the height is a multiple of 9 and the width is that multiple times 16. 1920 × 9 = 17,280 and 1080 × 16 = 17,280, so 1920 × 1080 passes. 1366 × 768 gives 12,294 against 12,288, so it does not.

Width × 9 must equal height × 16

The decimal form is 1.7777 recurring, written 1.78:1, and rounded decimals are where near-misses hide: dividing a width by 1.78 instead of multiplying by 9/16 is how 854 × 480 and 426 × 240 came to exist. Use whole-number arithmetic, or the aspect ratio calculator, which works in exact fractions. 16:9, 16x9, 16 by 9, 1.78:1 and 1.77:1 all name the same frame.

Where 16:9 came from: Kerns Powers, SMPTE, 1984

Kerns H. Powers of the SMPTE Working Group on High-Definition Electronic Production proposed 16:9 in 1984 as a round approximation of the geometric mean of 4:3 television and 2.40:1 cinema (≈1.77:1), so both could sit inside one frame with equal loss, as Wikipedia's 16:9 article documents.

Every standard 16:9 resolution from 256 × 144 to 7680 × 4320

There are 21 exact 16:9 sizes you are likely to meet between 256 × 144 and 7680 × 4320, and every one is a whole-number multiple of 16 by 9. The table gives each row's pixel count, its size relative to 1920 × 1080, whether both axes divide by 16, and the label it carries in standards or display lists.

Which rows are broadcast standards: BT.709 and BT.2020

Three rows are written into ITU recommendations. BT.709 defines HDTV as 1920 samples by 1080 lines at 16:9 with square pixels, and ITU-R BT.2020 defines the two UHDTV formats, 3840 × 2160 and 7680 × 4320, also at 16:9. The DCI cinema containers, 2048 × 1080 and 4096 × 2160, are not 16:9.

How to extend the ladder: multiples of 16 × 9, and why encoders like 256 × 144 steps

Any multiple of 16 × 9 is exact 16:9, and because H.264 encoders work in 16 × 16 pixel blocks the useful steps are multiples of 256 × 144, the smallest 16:9 size whose sides both divide by 16; the 1920 × 1088 case is explained on the 1920x1080 sheet.

Sizes YouTube lists that are not exact 16:9: 426 × 240 and 854 × 480

YouTube's own recommended-resolution list is six exact rows plus two rounded ones. YouTube's resolution and aspect ratio page lists 7680 × 4320 down through 640 × 360, all exact, then 854 × 480 for 480p and 426 × 240 for 240p. Exact 16:9 at those heights would be 853.33 and 426.67 pixels wide, so the two are 0.08% wider and 0.16% narrower than true 16:9.

3K resolution: 2880 × 1620, 3200 × 1800 and why the label has no standard

3K is a marketing label, not an ITU or SMPTE standard, and in 16:9 it means one of two panels: 2880 × 1620 (4,665,600 pixels, sold as 3K) or 3200 × 1800 (5,760,000 pixels, listed as QHD+). A third panel also sold as 3K, 2880 × 1800, is 16:10. The 2560 × 1440 and 3840 × 2160 tiers either side of it are covered on the 2.5K and 4K resolution sheet.

2880 × 1620: 2.25× Full HD, the size ASUS labels 3K

2880 × 1620 is 1.5 times 1920 × 1080 on each axis, so 2.25 times the pixels, 1.27 times 2560 × 1440 and exactly 9/16 of 3840 × 2160. The ASUS Vivobook S 15 OLED (S5506) tech specs describe the panel verbatim as "3K (2880 x 1620) OLED 16:9 aspect ratio".

3200 × 1800: QHD+, exactly four times 1600 × 900

3200 × 1800 doubles 1600 × 900 on each axis, which is why Wikipedia's graphics display resolution list files it as QHD+, the same list that records 2880 × 1620 as 3K and 2880 × 1800 as WQXGA+. It is 2.78 times Full HD, 1.56 times QHD and 0.69 of UHD.

The 3K panels that are not 16:9

2880 × 1800 divides to 1.6, which is 16:10, so a laptop advertised as 3K may be 11% taller than a 16:9 frame at the same width. On that panel a 16:9 video shows 10% of the height in bars total (5% top and 5% bottom).

Where 16:9 is used: TV, YouTube, monitors and AI video defaults

16:9 is the frame of the ITU HD and UHD broadcast standards (BT.709 and BT.2020), YouTube's stated standard aspect ratio on a computer, the most common PC-monitor shape since 2011, and the default landscape ratio of the video models in Playcut's catalog.

YouTube: the standard aspect ratio on a computer is 16:9

YouTube states that "the standard aspect ratio for YouTube on a computer is 16:9" and pads other shapes with white (dark grey in Dark theme) rather than cropping them, and it asks uploaders not to bake padding or black bars into the file. The full upload-size list is on the YouTube video size sheet.

PC monitors: 16:9 overtook 16:10 in 2011 and reached 77% of Steam users by 2022

Per Wikipedia's 16:9 article, which cites the Steam Hardware Survey, 1920 × 1080 became the most common Steam resolution in March 2011, displacing the 16:10 size 1680 × 1050, and by mid-2022 16:9 sizes were 77% of Steam users, with 1920 × 1080 alone at 67%.

All seven video models in Playcut's catalog offer 16:9 and default to it

In Playcut's model catalog, Veo 3.1, both Grok Imagine Video versions, Seedance 2.0, Gemini Omni Flash, HappyHorse 1.1 and Wan 2.7 all list 16:9, and every one of them defaults to it in the picker. Veo 3.1 and Omni Flash offer 16:9 and 9:16 only; the rest add 4:3, 1:1 and portrait shapes.

16:9 vs 4:3: the 25% rule, and the same math for 9:16, 1:1, 4:5 and 21:9

Cropping a 16:9 frame to 4:3 at equal height removes 25% of the width total (12.5% per side), so 1920 × 1080 becomes 1440 × 1080, 2560 × 1440 becomes 1920 × 1440 and 3840 × 2160 becomes 2880 × 2160. The reverse move, fitting 4:3 inside 16:9, leaves the same 25% of the width in bars total (12.5% per side). The 4:3 ladder itself is on the 4:3 aspect ratio resolutions sheet.

16:9

1920 × 1080

3:2

1620 × 1080

4:3

1440 × 1080

1:1

1080 × 1080

4:5

864 × 1080

9:16

608 × 1080

Pillarboxing 4:3 inside 16:9 and letterboxing 16:9 inside 4:3

4:3 content shown on a 16:9 screen gets 25% of the width in bars total (12.5% per side). 16:9 content shown inside a 4:3 frame at equal width gets 25% of the height in bars total (12.5% top and 12.5% bottom).

One table: what a 1920 × 1080 frame becomes in every other common shape

Narrower shapes crop the width at equal height; wider shapes crop the height at equal width. Percentages are the total removed, with the per-edge share in brackets.

Never stretch: the 33% face-widening problem

Stretching 4:3 to fill 16:9 widens faces by 33.3%, so crop or pad instead; the image resizer does either for a still.

YouTube thumbnails and Shorts: which one is 16:9

YouTube thumbnails are 16:9, and Shorts are the opposite shape. The YouTube custom thumbnail help page now recommends 3840 × 2160 with a minimum width of 640 pixels, so the long-quoted 1280 × 720 still passes but is no longer the stated size. Upload sizes for regular videos are on the YouTube video size sheet.

Thumbnails are 16:9: 3840 × 2160 recommended, 640 pixels minimum, 1280 × 720 still passes

The current YouTube thumbnail resolution guidance is 3840 × 2160 for videos and 2160 × 3840 for Shorts, in JPG or PNG, under 2 MB from mobile and under 50 MB from desktop. 1280 × 720 does not appear on the page; it remains valid only because it is 16:9 and wider than 640 pixels.

Shorts are 9:16, capped at 1080p, so a 16:9 upload is not a Short

The YouTube Shorts resolution is a vertical 1080p frame: the Shorts help pages state a maximum upload resolution of 1080p and a length of up to 3 minutes, and the thumbnail page asks for 9:16. YouTube classifies square or vertical uploads as Shorts; a 16:9 upload is treated as a regular video. The vertical ladder is on the 9:16 resolution sheet.

AI models that generate 16:9, and the exact pixels they output

Every video model in Playcut's catalog offers 16:9, but in our model notes only Seedance 2.0 has provider-documented 16:9 pixel sizes, and its 1080p file is 1920 × 1088. The Veo 3.1 and Nano Banana figures below are Playcut's own frame sizes, not provider-published output. Our Nano Banana table is a 43:24 grid, 0.8% wider than true 16:9.

Veo 3.1: 720p, 1080p and 4k tiers, with 8-second clips at 1080p and 4k

Veo 3.1 generates 720p, 1080p or 4k in 16:9 (its default) or 9:16. For image-to-video, Playcut prepares the 16:9 source frame at 1280 × 720 or 1920 × 1080 before upload; those are our sizes, not Google's published output. Clips at 1080p and 4k must be 8 seconds, and there is no per-ratio pixel figure for 4k, so do not assume 3840 × 2160.

Nano Banana Pro and Nano Banana 2: Playcut's 16:9 preset is 1376 × 768, 2752 × 1536 and 5504 × 3072, a 43:24 grid

Playcut's render targets for the Nano Banana Pro and Nano Banana 2 16:9 preset are 1376 × 768 (1K), 2752 × 1536 (2K) and 5504 × 3072 (4K); Google publishes no per-ratio pixel table, only the 1:1 sizes. All three divide to 1.7917 (43:24), so an exact 16:9 frame from the 2K tier is a 15-pixel width trim after scaling to 1080 tall.

Seedance 2.0: 864 × 480, 1248 × 704 and 1920 × 1088, every side a multiple of 16

Seedance 2.0's documented 16:9 outputs are 864 × 480 at 480p, 1248 × 704 at 720p and 1920 × 1088 at 1080p. 1248 × 704 is 1.7727 and 1920 × 1088 is 1.7647, and each side divides by 16, so a strict 16:9 delivery from the 1080p file needs an 8-pixel height crop.

Grok Imagine, Omni Flash, HappyHorse and Wan: 16:9 offered, per-ratio pixels not published

Grok Imagine Video (480p, 720p), Gemini Omni Flash (720p), HappyHorse 1.1 (720P, 1080P) and Wan 2.7 (720p, 1080p) all take 16:9 but publish no per-ratio pixel table; Grok Imagine Video 1.5 is image-to-video only, and HappyHorse and Wan image-to-video take no ratio. Inspect the file from Playcut's video generator rather than assuming 1080p means 1920 × 1080.

16:9 in code: CSS aspect-ratio, ffmpeg pad and scale, and the multiple-of-16 rule

In CSS a 16:9 box is aspect-ratio: 16 / 9; in ffmpeg any source fits inside 1920 × 1080 without distortion with a scale-then-pad chain; and some encoders report 1920 × 1088 because 1080 is not a multiple of 16 while 720, 1440 and 2160 are.

CSS: aspect-ratio: 16 / 9 and Tailwind's aspect-video

.frame-16-9 { aspect-ratio: 16 / 9; width: 100%; }
/* Tailwind: class="aspect-video" is the same declaration */

ffmpeg: fit any source into 1920 × 1080 without distortion, and scale=1920:-2 for even heights

# Fit any shape inside 1920x1080, centred, bars where needed
ffmpeg -i in.mp4 -vf "scale=1920:1080:force_original_aspect_ratio=decrease,pad=1920:1080:(ow-iw)/2:(oh-ih)/2" out.mp4

# Scale by width and keep the height even (required by most encoders)
ffmpeg -i in.mp4 -vf "scale=1920:-2" out.mp4

# Crop a 16:9 source to 4:3, keeping full height (12.5% per side)
ffmpeg -i in.mp4 -vf "crop=ih*4/3:ih" out.mp4

Why 1080 becomes 1088 in some encoders, and which ladder rows are macroblock-clean

H.264 (and MPEG-2) code the picture in 16 × 16 macroblocks, so a 1,080-line frame is coded as 68 block rows, 1,088 lines, and cropped back on playback; HEVC and AV1 use larger, variable block sizes and only need dimensions that divide by 8. Rows marked "Yes" in the ladder need no H.264 padding; 1920 × 1080, 2880 × 1620 and 3200 × 1800 do.

Checking a file: ffprobe prints width and height, and often N/A for the ratio fields

ffprobe -v error -select_streams v:0 -show_entries stream=width,height,display_aspect_ratio -of csv=p=0 in.mp4

A square-pixel 1920 × 1080 file prints 1920,1080,16:9. On many files the ratio field prints N/A because the container carries no aspect flag, so divide width by height yourself and apply the width × 9 = height × 16 test from the top of this sheet. The find your aspect ratio guide covers screens.