Guides / Outdoor & DOOH Advertising
Designing adverts for LED billboards that people can read
6 min read · Updated November 2026
A readable LED billboard advert has one message, very few words, large high-contrast type, a clear brand mark and simple motion, and it is built at the screen’s exact pixel resolution. People see a billboard for a few seconds from a distance, often while moving, so anything that would work on a phone or a poster — paragraphs, small print, busy photographs, thin fonts — fails. Design for the glance, test it on the actual screen, and the same slot delivers far more.
What is the single most important rule?
Say one thing. A billboard advert should carry one idea — an offer, a name, a date — that a viewer can take in within two or three seconds, with the brand clear enough to remember.
A practical guide many designers use is roughly seven words or fewer for the main message. That is hard when a client wants address, phone number, three offers and a slogan, but every extra element reduces the chance any of them is read.
If the client has several messages, split them across separate slots or campaigns rather than crowding one frame.
Why must you design at the screen’s native resolution?
Design at the screen’s exact pixel resolution, because an LED billboard has far fewer pixels than a phone or laptop and any scaling blurs text. A 6 × 3 m screen at P8 is 750 × 375 pixels — tiny by design standards — so artwork made at 1920 × 1080 and scaled down loses its fine detail.
Ask the operator for the exact resolution and aspect ratio before starting. Billboards are often wide or tall rather than 16:9, and artwork designed for a TV shape will be cropped or letterboxed.
At low resolution, thin lines and small type break up into stair-steps. Use bold weights, generous spacing and simple shapes; preview at 100% pixel size to see what the screen will actually show.
How big should text be?
Text must be large enough to read from the farthest important viewing position, which on a roadside screen usually means the main message fills a large share of the screen height. If it looks too big on your monitor, it is probably about right.
In pixel terms, very small text simply cannot form legible letters on a coarse-pitch screen; a main headline should use many pixel rows, and even secondary text should be well clear of the minimum. Test with the operator rather than guessing.
Choose clean, bold typefaces. Condensed, script and light fonts look elegant on paper and dissolve on an LED billboard. For Devanagari, choose a robust font with clear matras and test it on the screen, because fine strokes and ligatures suffer most at low resolution.
Should billboard adverts be in Nepali or English?
Use the language your audience reads fastest, and avoid running full messages in both languages in the same frame. Mixing two scripts in a few seconds of viewing halves the space for each and slows reading.
Many advertisers in Nepal use Nepali for the main message and English for the brand name, or the reverse, depending on audience. Either works if one language clearly leads.
Check spelling carefully in both scripts. A mistake on a large screen at a busy junction is very public.
What colours and contrast work best?
High contrast between text and background is essential: light text on a dark background, or dark text on a strong, plain colour, reads best. Avoid text over busy photographs or low-contrast colour pairs such as red on green or blue on black.
Dark backgrounds have a practical advantage on LED: they use less power, glare less at night and make bright text stand out. Large areas of pure white are harsh after dark and draw the most power.
Colours on an LED screen are more saturated than in print. Calibrated screens are accurate, but a brand colour that is subtle on paper can look intense, so preview on the screen if colour matters.
How much motion should a billboard advert use?
Use gentle motion to attract attention, then hold the message still long enough to read. Movement catches the eye; constant movement prevents reading.
A good pattern for a 10-second slot is a short reveal, a long static hold of the main message and brand, and a quick end card. Avoid rapid flashing, strobing and fast cuts, which distract drivers and may conflict with local conditions on approval.
Video works if the key frame communicates on its own. Many viewers will see only a few seconds of any slot, so do not hide the brand until the end.
How should you test an advert before it runs?
Test on the actual screen, from the viewing position, before the campaign starts. A short preview in daylight and at night reveals problems — small text, low contrast, dazzling white — that no monitor shows.
Operators who offer creative adaptation or a test window make it easier for local businesses to advertise well. Our selling ad slots guide covers how to package that, and we are happy to advise operators on setting resolution and scheduling correctly.
The short version
- One message, roughly seven words or fewer, readable in two or three seconds.
- Design at the screen’s exact pixel resolution and aspect ratio — never scale down.
- Use bold, clean typefaces; test Devanagari text on the actual screen.
- High contrast and dark backgrounds read best and glare less at night.
- Use gentle motion, then hold the message still; avoid flashing.
- Preview on the screen in daylight and at night before the campaign runs.
Common questions
What size should I make my artwork for an LED billboard?
Make it at the screen’s exact pixel resolution, which you get from the operator. LED billboards often have low resolutions and unusual aspect ratios, and artwork made at a standard video size will blur or crop when scaled.
How many words should be on a digital billboard ad?
As few as possible — around seven words or fewer for the main message is a good guide. Viewers see a billboard for a few seconds, often while moving, so every additional word reduces the chance any of them is read.
Can I use Nepali text on an LED screen?
Yes. Choose a bold, robust Devanagari font, make it large, and test it on the actual screen, because fine strokes and matras suffer at low resolution. Let one language lead rather than repeating the full message in two scripts.
Should I use video or a still image on a digital billboard?
Either can work. Simple motion attracts attention, but the main message and brand must be visible and held still long enough to read, because many viewers see only part of the slot. Avoid rapid flashing or fast cuts.
Why does my advert look blurry on the LED billboard?
Usually because it was designed at a different resolution and scaled to fit, or because the text is too small or thin for the screen’s pixel pitch. Rebuild it at the native resolution with bolder, larger type.
Where to go next
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