Billboard Creative Specs: A Technical Guide for OOH Production Teams

Creative that looks perfect in InDesign at 1/10 scale looks wrong printed at 14 feet by 48 feet. Billboard creative production is a discipline where the production specs determine the design approach, not the other way around. Get the specs wrong and the printed creative is rejected or looks poor in market. Get the specs right and you can design for the format instead of fighting it.

Standard Bulletin Billboard Specs (14x48)

The standard bulletin billboard - what most people picture when they think of a highway billboard - measures 14 feet tall by 48 feet wide (14x48). Physical dimensions for printed vinyl vary slightly by operator but the standard digital file specifications are:

• File format: PDF, TIFF, or EPS (PDF preferred by most operators)
• Resolution: 300 DPI at 1/10 scale, which equals 30 DPI at full size - this is non-negotiable for large format printing
• Color mode: CMYK (never RGB - RGB colors look very different when converted to CMYK at press)
• Bleed: 0.5 inches on all four sides beyond the trim marks
• Safe zone: 1 inch inside the trim on all sides - no critical elements should be placed outside this zone
• Maximum file size: Most operators accept up to 1GB for full-res files via FTP; confirm with the operator before supplying files above 500MB
• Fonts: Embed all fonts or convert to outlines before export

Some operators have moved to 100 DPI at 1/3 scale for newer flex printing equipment. If you are running the same creative across multiple operators, use the 300 DPI at 1/10 scale spec as the safe default and confirm variations with each operator in advance.

Junior Bulletin and Poster Specs

Two smaller static formats appear frequently in urban and suburban campaigns. The junior bulletin measures 10.5 feet tall by 36 feet wide. Posters (also called 30-sheet posters in older industry nomenclature) measure 12.5 feet tall by 27.5 feet wide. Both use the same resolution and file format requirements as bulletins but with proportionally adjusted bleed and safe zone dimensions.

Junior bulletins are often found in urban transit corridors, commercial districts, and retail-adjacent placements. The format's smaller size relative to a full bulletin means it requires more visual simplicity - complex backgrounds and small text elements that work at 14x48 become indistinct at 10.5x36, especially from moving vehicle distances of 100 to 200 feet. The same design principle applies more severely to posters, which are primarily read by pedestrian audiences at close range.

Digital OOH (DOOH) Creative Specs

Digital screens do not use printed vinyl and their technical specs are completely different from static formats. For DOOH, you are supplying a digital file - JPEG, PNG, or MP4 for animated content - that is served to a screen and displayed for a defined duration (typically 8 to 15 seconds per loop on a shared screen). Key specs:

• Screen resolution: Most large-format DOOH screens run at 1920x1080 pixels (HD). Some newer high-resolution formats run 3840x2160 (4K). Confirm the screen spec before delivering files.
• Aspect ratio: Standard bulletin format is 16:9. Some DOOH networks have non-standard aspect ratios (2:1, 4:1, or vertical portrait formats). Always get the pixel dimension spec, not just the ratio.
• Static creative: JPEG at 90%+ quality, RGB color mode (unlike print, screen content should be RGB)
• Animated content: H.264 MP4, 30 fps, duration must match the loop length exactly. A 10-second loop playing a 9-second MP4 will cause a visible black frame on most DOOH systems.
• Audio: DOOH screens in most outdoor locations do not play audio. Avoid designing around a sound component for standard placements.
• File delivery: Via operator's trafficking portal, FTP, or a programmatic DOOH SSP like Vistar or Place Exchange depending on how the inventory is bought

Transit and Street Furniture Specs

Transit advertising includes formats on buses, subway cars, transit shelters, and bus shelters. Street furniture includes phone kiosks, newspaper racks, and urban panels. Each operator - Intersection, Outfront, Clear Channel, transit authorities - has format-specific specs that differ by city and contract.

Bus shelter (transit shelter) specs for a standard four-sheet format: 40 inches wide by 60 inches tall in most US markets. Resolution is higher than bulletins because viewing distance is shorter - pedestrians view transit shelter ads from 2 to 8 feet rather than 100+ feet. Many transit operators require 200 DPI at full size (not scaled) for transit shelter posters. Backlit formats require high-contrast design - backgrounds that look dark on screen may appear washed out on backlit vinyl. Always request the operator's backlit version of the color profile when building creative for transit shelters.

Design Principles That Apply Specifically to OOH Formats

OOH creative design follows different principles from digital advertising design because the audience is moving, the viewing time is short, and the viewing angle is often oblique. Three rules matter more than anything else. First: the 3-second rule. Highway billboard creative should communicate its message to a driver in 3 seconds or less. This means one idea, one image, one call to action, maximum. Research from the Outdoor Advertising Association of America (OAAA) consistently shows that billboard ads with more than 7 words of copy have significantly lower recall than those with 7 or fewer words.

Second: minimum type size. The OAAA recommends minimum headline type of 18 to 24 inches at full size for highway placements. At 1/10 scale in your design file, this means minimum 1.8 to 2.4 inches for headline text. For body copy, the recommendation is against using it on highway formats at all - if text needs to be read rather than seen, it belongs in a different medium. Pedestrian-focused formats like transit shelters allow more text because viewing distance and dwell time are higher, but even there, maximum copy is 25 to 30 words.

Third: contrast requirements for outdoor. Outdoor advertising is viewed in direct sunlight, shade, night with ambient light, rain, and fog. Design with extreme contrast between foreground and background. Pure black on pure white is the most legible combination at any distance. Red on white and white on red work well. Yellow on black and black on yellow are also high-contrast combinations frequently used in directional OOH. Avoid mid-value colors in the same value range - gray on gray, medium blue on dark blue - these combinations disappear at distance even though they look fine on a monitor.

How OOH My Media Handles Creative Specs

When you book a placement through OOH My Media, our platform automatically provides the operator-specific creative specifications for that placement at confirmation. Every placement in our inventory has an associated spec sheet that includes the exact file requirements, color mode, resolution, bleed dimensions, and delivery method. The spec sheet is available to download immediately after booking, so your production team has the information they need without waiting for operator communication.

For DOOH placements bought through our programmatic integrations (Vistar, Place Exchange), creative trafficking is managed directly through the platform. Upload your creative file, confirm it meets the displayed spec requirements, and the file is transmitted to the operator through our trafficking integration. You do not need a separate account with the SSP or a direct operator relationship to deliver DOOH creative. The 48-hour timeline from booking confirmation to campaign live is partly determined by the creative delivery step - uploading your creative file within 4 hours of booking puts you on track for a 24 to 36 hour live time rather than the full 48 hours.

Common Production Mistakes and How to Avoid Them

The most frequent creative rejection reasons we see on the platform: file supplied in RGB instead of CMYK for print formats (color shift at press renders skin tones and brand colors incorrectly), fonts not embedded or outlined (operator's RIP software substitutes a default font), resolution below minimum (pixelated print that fails operator's proof review), and MP4 duration mismatch on DOOH (creative plays black frame at loop end). All of these are avoidable with a production checklist review before file delivery. OOH My Media's creative upload interface includes a pre-delivery checklist that flags the most common technical issues before submission.