Digital signage aspect ratios explained: 16:9, 9:16, 4:3, 21:9 and stretched displays
Quick answer: DigitalSignage.com's guidance on aspect ratios is to design for the ratio of the screen you own: 16:9 (1920 x 1080 or 3840 x 2160) for almost every landscape display, 9:16 (1080 x 1920) for portrait, 1:1 for square panels, 32:9 or wider for stretched bar displays, and the cabinet grid for an LED wall. When content and screen disagree you must letterbox (bars), crop (lose edges) or stretch (distort). A 16:9 video on a 9:16 screen fills only 31.6 percent of it when letterboxed, so make a portrait version instead.
Key facts
- Aspect ratio is width divided by height: 16:9 is 1.78, 9:16 is 0.56, 4:3 is 1.33, 32:9 is 3.56 and 1:1 is 1.00.
- A 16:9 frame fitted inside a 9:16 screen shrinks to 1080 x 608 pixels with bars of 656 pixels above and below on a 1080 x 1920 portrait screen.
- Cropping a 16:9 frame to fill a 9:16 screen keeps a vertical slice 31.6 percent of the original width: 608 of 1920 pixels from a 1080p source, or 1215 of 3840 from a 4K source.
- A 4:3 image on a 16:9 screen gets 240-pixel pillars on each side at 1080p and uses 75 percent of the screen.
- Stretching 16:9 content onto a 9:16 screen distorts shapes by a factor of 3.16, which is why stretch is never acceptable for faces, logos or text.
- One master can serve both 16:9 and 9:16 if everything essential sits in the centre square whose side is 56.25 percent of the long edge.
Last updated October 25, 2026.
What aspect ratio is digital signage?
Most digital signage is 16:9, because nearly every TV and commercial display sold in 2026 is a 16:9 panel at 1920 x 1080 or 3840 x 2160. Mount the same panel vertically and it becomes 9:16. The other ratios belong to specialist hardware: square LED tiles, ultrawide monitors, stretched bar displays on shelves and transit, and LED walls built from cabinets.
| Ratio | Decimal (width / height) | Common resolutions | Where it is used in signage |
|---|---|---|---|
| 16:9 | 1.78 | 1280 x 720, 1920 x 1080, 3840 x 2160 | Landscape TVs and commercial displays, menu boards, lobbies |
| 9:16 | 0.56 | 1080 x 1920, 2160 x 3840 | Portrait screens, wayfinding, retail posters, kiosks |
| 4:3 | 1.33 | 1024 x 768, 1440 x 1080, 1600 x 1200 | Legacy monitors, some tablets, older content |
| 3:4 | 0.75 | 768 x 1024, 1536 x 2048 | Tablets in portrait, small counter screens |
| 1:1 | 1.00 | 1080 x 1080 | Square LED tiles and panels, social posts |
| "21:9" ultrawide | 2.37 to 2.39 | 2560 x 1080, 3440 x 1440 | Ultrawide monitors, cinematic video, reception desks |
| 32:9 | 3.56 | 1920 x 540, 3840 x 1080, 5120 x 1440 | Stretched bar displays, transit headers, double-wide canvases |
| 48:9 (16:3) | 5.33 | 1920 x 360 | Very thin bar displays above shelves and counters |
| Wall-specific | Columns x cabinet width / rows x cabinet height | Size divided by pixel pitch | Direct-view LED walls |
Bottom line: 16:9 and 9:16 cover the large majority of screens, and every other ratio needs content made for it on purpose.
Note that "21:9" is a marketing label. A 2560 x 1080 monitor is really 64:27, or 2.37, and 3440 x 1440 is 43:18, or 2.39. Design to the actual pixel count on the spec sheet, not to the label on the box. The same goes for stretched bar displays: they are cut or built in many sizes, so read the native resolution of the specific model before you make content.
Aspect ratio is separate from resolution. A 1280 x 720 and a 3840 x 2160 screen share the same 16:9 shape, so a 16:9 design scales cleanly between them, while a 1920 x 1080 and a 1080 x 1920 screen share the same pixel count but have opposite shapes. Our screen resolution standards page covers the pixel side.
What are stretched bar displays and which ratios do they use?
A stretched bar display, also called a stretch or bar-type LCD, is a long thin screen cut from a standard panel or built to that shape, used above shelves, along counters, on transit vehicles and as headers over menu boards. Common shapes run from 32:9 down to 48:9 and thinner, and each needs content made at its exact native resolution.
Because these panels are so wide, a normal 16:9 image placed on them is either a small box in the middle or a thin horizontal slice of the original. Good bar content is designed as a strip: a single line of text, a price, a logo and a short animation that scrolls or wipes along the length. Keep text height to about half the bar height so it does not touch the edges.
A 32:9 canvas is also what you get when two 16:9 screens sit side by side as one image: two 1920 x 1080 panels make 3840 x 1080. That is why SignStudio's Ultrawide preset is 3840 x 1080; it serves both a true 32:9 panel and a pair of standard screens.
What is the difference between letterbox, crop and stretch?
These are the three ways to put content of one ratio onto a screen of another. Letterbox (or pillarbox) scales the content until it fits entirely and fills the rest with bars. Crop, often called cover or fill, scales until the screen is filled and cuts the overflow. Stretch scales width and height independently, so nothing is lost but everything is distorted.
| Method | Formula | 4:3 image on a 1920 x 1080 screen | 16:9 video on a 1080 x 1920 screen | Use it for |
|---|---|---|---|---|
| Letterbox or pillarbox (contain) | scale = smaller of screen width / content width and screen height / content height | 1440 x 1080 picture, 240-pixel bars left and right, 75 percent of the screen used | 1080 x 608 picture, 656-pixel bars top and bottom, 31.6 percent used | Content where nothing may be cut, such as charts and legal text |
| Crop (cover) | scale = larger of the two ratios, then cut the overflow | 1920 x 1440 scaled, 180 pixels cut from top and bottom | 3413 x 1920 scaled, only the centre 1080 pixels of width kept | Photos and video with a centred subject |
| Stretch | width and height scaled independently | Everything 1.33 times too wide | Everything 3.16 times too thin relative to its height | Abstract backgrounds only, never faces, logos or text |
| Re-edit for the ratio | Make a native version | Full screen, no loss | Full screen, no loss | Anything that matters |
Bottom line: contain loses screen area, cover loses content, stretch loses shape, and only a native version for the ratio loses nothing.
The distortion factor of a stretch is the content ratio divided by the screen ratio. For 4:3 on 16:9 that is 1.78 divided by 1.33, so circles become ovals 1.33 times wider than tall. For 16:9 on 9:16 it is 1.78 divided by 0.56, or 3.16, which turns a face into a sliver. Viewers notice distortion of people and logos instantly, so the fix is never to stretch.
A practical trick with letterboxing is to use the bars. On a portrait screen, the 656-pixel bands above and below a centred 16:9 video are each larger than a full ticker strip, so they can carry a headline, a logo and a price rather than empty black. The content looks stretched, cropped or has black bars page lists every symptom and its fix.
How do you design one asset for two aspect ratios?
Design a master that is larger than both targets and keep everything essential inside the area they share, called the safe crop zone. For 16:9 and 9:16 the shared area of two centred frames is a square whose side is the short edge of each: 1215 x 1215 pixels on a 2160 x 2160 master.
| Targets | Master size | 16:9 crop | 9:16 crop | Safe crop zone (essential content) |
|---|---|---|---|---|
| 16:9 and 9:16 at 4K | 3840 x 3840 | 3840 x 2160 | 2160 x 3840 | Centre 2160 x 2160 |
| 16:9 and 9:16 at 1080p | 1920 x 1920 | 1920 x 1080 | 1080 x 1920 | Centre 1080 x 1080 |
| 16:9 and 9:16 from a square 2160 master | 2160 x 2160 | 2160 x 1215 | 1215 x 2160 | Centre 1215 x 1215 |
| 16:9 and 4:3 at 1080p | 1920 x 1080 | Full frame | 1440 x 1080 centre | Centre 1440 x 1080 |
| 16:9 and 32:9 | 3840 x 2160 | Full frame | 3840 x 1080 band | Centre band 3840 x 1080 |
Bottom line: keep the subject, the text and the logo in the shared centre area and let backgrounds bleed beyond it, and one master yields every crop.
For video, shoot or render with the subject centred and leave space on all sides. A camera operator who knows the footage will also run on portrait screens frames wider than usual and keeps faces near the vertical centre line. Text is the exception to the one-master approach: a headline that fits a 1920-pixel width rarely fits a 1080-pixel width at the same size, so set text separately for each ratio rather than baking it into the footage.
What aspect ratio is an LED video wall?
An LED wall has whatever ratio its cabinet grid produces. The ratio is the number of columns times the cabinet width, divided by the number of rows times the cabinet height. Common cabinets are 500 x 500 mm squares, 500 x 1000 mm tall rectangles and 16:9 cabinets such as 600 x 337.5 mm; check the manufacturer's sheet.
With square 500 x 500 mm cabinets, a true 16:9 wall needs 16 columns and 9 rows, which is 8 x 4.5 metres. Smaller walls approximate it: 7 columns by 4 rows is 3.5 x 2.0 metres, a ratio of 1.75, close to 16:9's 1.78. At 2.5 mm pixel pitch, each cabinet is 200 x 200 pixels, so that wall is 1400 x 800 pixels. Content made at 1920 x 1080 is then scaled by the wall's processor, and the 0.03 ratio difference shows as a few pixels of crop or bars.
Because LED walls are built to fit the architecture, many are 2:1, 3:1 or wider. Ask the installer for the wall's exact pixel resolution, not its ratio, and build the canvas at that size. Our video walls guide covers pitch and processors, and video wall design covers content layout.
Worked example: converting a 16:9 video for a 9:16 portrait screen
A restaurant has a 1920 x 1080 promotional video and a new 55-inch screen mounted in portrait at 1080 x 1920. Here are the three options, computed step by step.
| Step | Calculation | Result |
|---|---|---|
| 1. Ratios | Video 1920 / 1080 = 1.78; screen 1080 / 1920 = 0.56 | Opposite shapes |
| 2. Letterbox scale | Smaller of 1080 / 1920 = 0.5625 and 1920 / 1080 = 1.78 | Scale 0.5625 |
| 3. Letterboxed picture | 1920 x 0.5625 = 1080 wide; 1080 x 0.5625 = 607.5, about 608 tall | 1080 x 608 in the middle |
| 4. Bars | (1920 - 607.5) / 2 = 656.25 | About 656 pixels above and below |
| 5. Area used | 607.5 / 1920 | 31.6 percent of the screen |
| 6. Crop from the 1080p file | Height must fill 1920, so scale 1.78 and keep a 9:16 slice; slice width 1080 x 9 / 16 = 607.5 | A 608 x 1080 slice enlarged 1.78 times: soft |
| 7. Crop from a 4K original | Slice width 2160 x 9 / 16 = 1215, so a 1215 x 2160 slice | Scaled down by 1080 / 1215 = 0.889: sharp |
| 8. Stretch | Horizontal 0.5625, vertical 1.78, factor 3.16 | Rejected |
Bottom line: with only the 1080p file, letterbox it and use the two 656-pixel bands for a headline and the price; with the 4K original, crop a 1215 x 2160 slice and get a sharp full-screen portrait video.
The decision depends on the source. A crop from a 1080p file keeps only 608 of its 1920 columns and enlarges them 1.78 times, so a close-up product shot may survive but text will not. A crop from 4K keeps 1215 columns and shrinks them, so it is sharper than the portrait screen needs. If the subject moves across the frame, a static centre crop will lose it, and the video should be re-edited with the crop window following the subject.
Encode the result natively at 1080 x 1920; the video encoding guide recommends encoding portrait content in portrait rather than rotating it at playback.
How to do this in DigitalSignage.com
In SignStudio, the scene's preset sets the aspect ratio: HD 1920 x 1080 (16:9), 4K UHD 3840 x 2160 (16:9), Portrait HD 1080 x 1920 (9:16), Square 1080 x 1080 (1:1), Ultrawide 3840 x 1080 (32:9), and Custom for any other panel or wall. Build each scene at the ratio of the screen that will play it.
- Create the scene with the preset matching the panel, or a custom size equal to the wall's pixel resolution.
- For portrait, set the scene orientation to portrait and rotate the player's output to match the mounted screen, as described in portrait screens and rotation.
- For media that is not the zone's shape, set the Image component's fit mode to contain (letterbox) or cover (crop); avoid stretch.
- Upload a native portrait or bar version of key videos instead of relying on fit modes.
- Check the screen in person, since overscan on a TV can also crop the edges.
Our documentation describes fit modes for the Image component; whether the Video component offers the same contain and cover options on every player is not documented, so encode video at the zone's exact shape or ask support (support@digitalsignage.com, live chat at https://chat.digitalsignage.com/).
Frequently asked questions
Digital signage aspect ratios explained: 16:9, 9:16, 4:3, 21:9 and stretched displays
16:9 (1920 x 1080, 3840 x 2160) is the standard landscape ratio for nearly all signage displays, 9:16 (1080 x 1920) is the same panel mounted in portrait, 4:3 is legacy, 21:9 ultrawide is really 2.37 to 2.39, and stretched bar displays run from 32:9 to 48:9 and thinner. Make content at the ratio of the screen; otherwise it is letterboxed, cropped or stretched.
What is the best aspect ratio for digital signage?
The one your screen has, which for most displays is 16:9 in landscape or 9:16 in portrait. Content made at the screen's ratio fills it with no bars, no crop and no distortion. Specialist panels such as stretched bars and LED walls need content at their own native resolution.
How do I fit a 16:9 video on a vertical 9:16 screen?
Either letterbox it, which gives a 1080 x 608 picture with 656-pixel bars above and below on a 1080 x 1920 screen, or crop a vertical slice from the centre. Cropping a 1080p source enlarges it 1.78 times and looks soft; cropping a 4K source keeps a 1215 x 2160 slice and looks sharp. The best result is a version edited for portrait.
Why does my content have black bars?
The content's aspect ratio differs from the screen or zone it is in, so the player fits it whole and fills the gap with bars. A 4:3 image on a 16:9 screen gets bars at the sides, a 21:9 video gets bars above and below. Make the file at the zone's ratio, or set the fit mode to cover if a crop is acceptable.
Is it OK to stretch content to fill the screen?
Only for abstract backgrounds. Stretching scales width and height differently, so 4:3 content on 16:9 becomes 1.33 times too wide and 16:9 on 9:16 is distorted by 3.16 times. People, logos and text look visibly wrong. Letterbox or crop instead.
What resolution is a stretched bar display?
It depends on the model. Common native resolutions include 1920 x 540 and 3840 x 1080 (32:9) and 1920 x 360 (48:9), with thinner bars also sold. Read the exact native resolution on the model's spec sheet and make content at that pixel size.
What aspect ratio is an LED wall?
Whatever its cabinet grid produces: columns times cabinet width divided by rows times cabinet height. Seven 500 mm cabinets across and four down is 3.5 x 2.0 metres, a ratio of 1.75; at 2.5 mm pitch that wall is 1400 x 800 pixels. Ask the installer for the pixel resolution and build content at that size.
Related guides
- Portrait screens and rotation
- Content looks stretched, cropped or has black bars
- Screen resolution standards for digital signage
- Screen layouts, zones and templates in SignStudio
- Video encoding guide
- Video walls for digital signage
- Video wall design
- What size should images be for digital signage?
- Safe area and margins for digital signage design
- TV and display dimensions by screen size
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Maintained by MediaSignage Inc., operator of DigitalSignage.com since 2006. Product behavior on this page comes from our own SignStudio and SignPlayer documentation; where we do not document a step, this page says so instead of guessing. Last reviewed October 25, 2026.