Programmatic DOOH: Why the preview belongs in the buying process

A campaign is set up in the DSP on Tuesday and is due to go live on Thursday. The creative came from the studio as an MP4, has the right dimensions and passes. Nobody has seen how it looks on the screen at the station. Not the agency, not the media owner.

That is how this channel usually works. Programmatic DOOH makes buying fast. At no point does anyone ask whether the creative works on that particular screen. That question belongs in the process, and it belongs before the booking.

1. Who checks the creative today, and when

In a direct deal the media owner often sees the creative with the proposal. In programmatic it only arrives with the campaign setup. The DSP mediasmart describes it plainly: approval sits with the media owners of the screens, not with the SSPs, and it can take 24 to 48 hours, in some cases up to a week.

For agencies this means a rejected creative costs days. On a two-week flight, that is a large share of the reach.

30-second test: Look at your last five programmatic campaigns. How many days passed between upload and first play? If you don’t know, that is the gap.

2. What approval checks, and what it doesn’t

The media owner’s review is a compliance check. According to invidis, large DOOH media owners process tens of thousands of programmatic creatives every month, and the volume doubles every year. In 2025 Broadsign presented an AI assistant that analyses creatives for aspect ratio, resolution and inappropriate language, among other things, and suggests categories.

That makes sense and saves time. But it answers questions about the file. Whether the headline reads from twenty metres, whether the logo disappears in backlight, whether the spot lands its punchline too late: none of that appears in an approval log. Nobody owns it.

30-second test: Take an approved creative and ask your team who saw it on the real screen before launch. Usually the answer is nobody.

3. Few file formats, very different screens

Programmatic has standardised formats. According to Broadsign’s Programmatic DOOH Trends Report, the 1080 × 1920 and 1920 × 1080 video formats together made up 77 percent of video spend. For display ads, three formats accounted for 79 percent.

For creative teams that is convenient. One file runs in the mall, on the platform and on the arterial road. Yet these places share nothing except the aspect ratio. On a platform the viewer stands three metres away and waits. On the road they pass at 50 km/h. A creative built for one of these places rarely fits the other.

30-second test: Put the same creative on two screens of the same format, one indoors, one by the road. What works in both places can go into the deal. What works in only one needs a second version.

4. The market is getting faster and more local

Programmatic DOOH is growing fast in the DACH region. The DSP Displayce counted 461 campaigns on its platform from January to the end of July 2026, up 136 percent on the same period a year earlier. 98.9 percent of them were activated in self-service. 18 percent used POI targeting, compared with 0.5 percent the year before.

Scale matters here. According to a study by the World Out of Home Organization, programmatic accounted for roughly 7 percent of global DOOH spend in 2025, and 9.4 percent in EMEA. This is a channel still being built.

Our view: that is exactly why it pays to get the process right now. More self-service and more small, local campaigns mean fewer people between upload and screen. So the preview has to happen where the decision is made.

30-second test: Check whether your deal proposal or PMP description contains a link that lets the buyer see their creative on the screen. If not, all they get is a spec sheet.

5. Where the preview belongs

For media owners, the preview belongs in the proposal. One link per network or per premium screen that lets an agency put its creative on the screen before buying. It answers the questions that would otherwise only surface with a rejection, and it sells the screen at the same time.

For agencies, it belongs before the DSP upload. Teams that have seen the creative in the three most important environments of the campaign resend files less often. And the client approves something they have already seen on the street.

In practice we see that this needs no new process step. It is enough to add the preview to the documents that go out anyway.

30-second test: Open your standard proposal for programmatic deals. Does it contain a preview? That means the buyer’s creative on the screen; a photo of the site is not enough.

Why a live simulation makes this possible

Nobody builds a hand-made preview for every deal. With a live simulation in the browser, the creative sits on the real screen in seconds, as a still or as a running spot in the loop. Media owners can embed the Creative Simulator in their own design in their portal or proposals. Agencies use it to check before upload, without image editing and without waiting for an approval.

Sources

• What is the creative approval process for DOOH? — mediasmart
• DooH: Broadsign Accelerates Workflow with AI — invidis
• Broadsign Trends Report: Programmatic DooH Is Maturing — invidis
• Displayce Analysis: Programmatic DooH Surges in DACH Region — invidis
• DooH: WOO Study Reveals USD 1.4bn Global Programmatic DooH Market — invidis