For one air-gapped display, buy a screen with the offline player built in and carry the show over on a USB stick you prepare on your PC; no account, no subscription and no network. A separate offline player only earns its place when the show must change at set times, the files need a format the screen cannot decode, or a second display is coming.
For one display that must never touch a network, the simplest buy is a screen with the offline player built in. You make the show on your PC, write it to a USB stick or memory card, carry the stick to the screen, and the screen loops it with nothing else attached. A separate offline player box earns its place only when the show must change at set times of day, the video files use a format the screen cannot decode, or a second display is on the way. This is the security-driven version of the buying question. The plain hardware question, Wi-Fi or no Wi-Fi, is answered in a USB digital signage screen with no Wi-Fi; here the network is not merely absent, it is policy, so the screen, the stick and the software on your PC all have to pass a review.
The short answer
Buy one display with playback built in and skip the extra box. The screen reads images and video straight from the stick, keeps its own copy of the show in internal memory so the loop carries on when the stick comes out, brings the show up full screen at power-on with no launcher and no keyboard, and holds a daily on time and off time. There is no subscription. The stick is the only path in, and it carries show files only. A separate player adds value in exactly three cases: shows timed to the clock, video formats the built-in player cannot decode, or a fleet of screens later. Everything else about the air gap is workflow, and the workflow is a walk across the building with a stick in your pocket.
What decides it
Four questions decide it, and you can answer all four before you spend anything.
Does anything change at a set time? A built-in player loops one show between a daily on time and an off time. If the show itself has to switch, say a morning version and an afternoon version, that timing belongs to a separate player.
What has to play? If your masters are slides and ordinary video, export them to the formats a built-in player reads and the decision is closed. If you must play a specialist format straight from the source, that pushes you to a separate player.
How often does the show change? A weekly swap by hand suits a single screen. Daily still works and costs five minutes at the screen. Twice a day starts to argue for an internal server, if your rules allow one.
What happens when the power comes back? The display has to switch on when mains returns, and the player has to start the show at power-on. Both are checkable in the shop, before the screen is on a lobby wall.
The options for an air-gapped screen
| Option | How the show gets in | Pick it when |
|---|---|---|
| Display with built-in offline player | Stick or card written on your PC; the screen copies the show and loops it | One screen, one looping show, updates carried by hand |
| Consumer TV with USB playback | Files read from the stick through the TV's own media menu | The screen runs a few hours a week and a TV menu at boot is acceptable |
| Single-board computer with open-source player software | A card you write with the software you install and maintain | Someone on staff will own it as a project for years |
| Dedicated offline media player | A small box that takes shows from PC software on its card | Timed shows, formats the screen cannot decode, or more screens later |
The TV row is the trap. A consumer TV's USB slot is made for browsing photos and clips from a menu, not for a show that has to appear unattended after an outage; the reasons are laid out in smart TV digital signage app or a separate player. The single-board computer works, but the air gap buys you nothing there that a built-in player does, and you take on the maintenance.
What the air gap asks of each part
The network side stays unused. Nothing plugs into the LAN port and no wireless network is configured. A player that reads the stick directly needs no connection to loop a show, so the network hardware simply sits idle.
The stick is the only door. Put show files on it and nothing else: no saved logins, no documents, no tools. If your security review wants the door to open one way only, use a stick with a physical write-protect switch and present the show read-only. A lost stick then costs you files that still live on your PC.
Recovery has to be automatic. When the mains fails, two things have to come back without a person. The display needs its power-on-when-mains-returns setting, and the player brings the show up full screen at power-on. If the app stops, it is designed to start again within seconds and go back to playing. The failure paths are worked through in signage power loss recovery for offline displays.
Example: one lobby screen, one stick a week
A reception screen hangs behind the desk, watched from 10 ft by people walking past, and plays weekdays from 07:00 to 19:00.
Size it first. The FHWA planning figure is 30 ft of viewing distance per inch of capital letter height; for a lobby, where people glance while moving, use the safer 20 ft per inch. At 10 ft: 10 ÷ 20 = 0.5 in capitals for headings. Body text scales down from there. The rest of the layout math is in the guide to screen size and viewing distance.
Build a 60-second loop: 10 slides at 6 seconds each, 10 × 6 = 60 s. The screen is on for 12 h a day, which is 12 × 3,600 = 43,200 s, so it plays 43,200 ÷ 60 = 720 loops a day and 720 × 5 = 3,600 loops in the working week.
Encode the loop as H.264 MP4 at 1920 x 1080 and 8 Mb/s, a common starting point for 1080p30. File size: 8 Mb/s × 60 s = 480 Mb = 60 MB. Ten slide images as JPG add under 10 MB at 1080p, so the whole show is about 70 MB, and a 32 GB stick holds roughly 32,000 ÷ 70 = 457 shows this size. The bitrate is a starting point, not a constant; the piece on video bitrate for signage players says to play the exported file on the real screen before you commit.
Each Monday someone writes the stick at their desk, walks it over, swaps it and is gone in five minutes. The old loop keeps playing from the screen's internal copy until the new show is loaded. Nothing in this example needs a separate player.
When a separate offline player earns its place
Three cases, in the order they usually arrive:
- The show changes at set times. The built-in player loops one show on a daily on and off schedule. Different shows for morning, midday and close need a player that stores several playlists and switches between them on its own clock.
- The files need a decoder the screen lacks. If your studio exports a video format the screen's player does not list, transcode it on your PC or move to a player that decodes it natively.
- A second screen is coming. One stick for one screen scales badly. A player platform with a publish step that feeds several screens saves the walk, even offline.
One middle path deserves a note before you commit to sticks forever. If the policy is "nothing reaches the internet" and not "no network cable at all", an on-premise server on a restricted internal segment updates the screen without anyone walking over; whether that server itself needs outside access is a separate question, answered in does an on-premise signage CMS server need internet. Ask which sentence your security team actually means, because it changes the hardware you buy.
Loading the show from your PC
A built-in player reads images as JPG, PNG or WebP and video as MP4, M4V or WebM, with H.264 MP4 the safe choice because H.265 and VP9 depend on the unit. PowerPoint, PDF, HEIC and GIF do not play, so anything starting life in one of those is exported first. If the show starts as a slide deck with timings, save it as a video; the settings that survive the export are in export slides to video for an offline signage player.
Or skip the file-wrangling and build the show in an app. IMD Signage Studio is a free Windows 10 and 11 program with no subscription and no account:
- Answer its three picture questions, pick a ready-made slide (menu, offer, opening hours, welcome, guest Wi-Fi code) and type your own words over it.
- Press "Watch it" and watch the show play with its real timings on your PC.
- Write the show to the stick. Every file is read back as it is written and the stick is made safe to take out, so a bad copy is caught at your desk.
- Carry the stick to the screen, fit it and load the new show.
The shows it builds run on IMD Signage displays with IMD Signage Player 1.1.0 or newer.
What to ask for
Take this list to the checkout or the quote:
- Playback from USB stick or memory card with no network connection, no subscription and no second box.
- H.264 MP4 at 1920 x 1080 on the supported list.
- A setting that powers the display on when mains returns.
- Daily on and off times.
- One rotation setting, if the screen hangs portrait.
- A mount that matches the wall: panel cut-out dimensions for flush fitting, or a VESA pattern for an arm.
Our own panel-mount displays run this route as described: images and video from microSD or USB, no subscription, the player included. The larger wall models in the current range are quoted per project, with software, ports, power and warranty confirmed in the quote.
The decision
Recommendation: For a single air-gapped display playing one looping show, buy a screen with the offline player built in, feed it from a stick you prepare on your PC, and set a daily on and off time. Keep the stick to show files, confirm the display powers on after a mains failure, and export everything to H.264 MP4 at 1920 x 1080 or JPG. Move to a dedicated offline player when the show must switch at set times, when your video format is one the screen cannot decode, or when a second display is coming.
Questions
Can the same show run on a portrait screen?
Yes. Rotation is one setting on the player, so the same unit plays the same loop landscape or portrait. Build the slides in the shape the screen will hang before you write the stick, and nothing needs reworking at the wall.
Do the videos play with sound?
Videos play muted unless you turn sound on in the settings, which is usually what a lobby or a shop floor wants; a loop with a soundtrack gets old quickly for the people who work near it. If the show needs audio, it is one setting, and you will hear it every time the loop reaches the clip.
How does staff load a new card without pulling the screen apart?
A hidden menu protected by a staff PIN opens on the screen itself. Your team uses it to reload a card or check the player, so the weekly swap needs no keyboard and no tools, and nobody climbs behind the unit to reach a port.
Can the screen switch itself off at night?
Set a daily on time and off time in the player. Outside those hours it shows black at minimum brightness, because the app cannot switch the backlight off. Plan the mount and the socket so someone can still reach the mains switch if the schedule ever has to change by hand.
Planning information, not legal or engineering advice. Rules differ by place: check codes and permits with your local authority and your licensed trades.