Phone LED Banner
Type a message and play it full screen in big scrolling letters. No app to install, and your message stays in your browser.
How to use the phone LED banner
- Type up to 60 characters, or tap a saved message.
- Pick the motion, text size, speed and colors. The preview updates as you go.
- Tap “Play full screen” and hold your phone sideways. Tap the screen to show Close, or press Esc.
| Motion | Good for | How it looks |
|---|---|---|
| Scroll | Longer messages, names, cheers | Text enters from the right and leaves on the left |
| Blink | Short words (Over here, TAXI) | Catches the eye from far away |
| Still | One or two words, photos | Shrinks to fit and stays centered |
Colors you can read from far away
Contrast is the WCAG ratio between text and background (1:1 to 21:1). WCAG asks for at least 4.5:1 for normal text and 3:1 for large text. The banner warns you below 2:1.
| Text / background | Contrast | Readability |
|---|---|---|
| Yellow / Black | 14.5 : 1 | Good |
| White / Black | 21.0 : 1 | Good |
| Green / Black | 9.2 : 1 | Good |
| Red / Black | 5.7 : 1 | Good |
| Charcoal / Yellow | 11.4 : 1 | Good |
| White / Blue | 3.7 : 1 | Large text only |
| White / Red | 3.7 : 1 | Large text only |
| Yellow / White | 1.4 : 1 | Hard to read |
iPhone and Android
On Android Chrome the banner goes full screen and turns sideways by itself. iPhone Safari doesn't let web pages go full screen, so the banner is drawn rotated 90°; hold the phone turned to the left. The screen is kept awake while it plays where the browser allows it.
Your message is saved only in this browser. It is never sent to a server or added to share links.
Sources
FAQ
How do I make my phone an LED banner?
Type your message, tap “Play full screen” and hold the phone sideways.
Does it work on iPhone?
Yes. iPhone Safari can't go full screen, so the banner is drawn rotated; hold the phone turned to the left.
Which colors are easiest to read?
Yellow or white text on black has the highest contrast.