Type any text, pick a size, speed, color and direction, and it scrolls across your phone's full screen like an LED marquee — handy for concerts, pick-up signs, events and shop windows. Works with Chinese, Japanese, Korean, Latin text and emoji mixed together. No install, no account.

Multi-phone mode: lay several phones side by side, open Scroll Sign on each, and use one controller phone to number them, set the shared text and a common start time, and press start. Each phone shows its own slice, so the row reads as one wide screen.

PWA WebSocket Fullscreen API Service Worker

See it in action

Open it on your phone, type a message and tap Start display. Tap the screen to pause, ✕ to exit. Add it to your home screen to use it offline.

Try Scroll Sign →

Source on GitHub (MIT)

Good to know

Get started in a minute

Open the page, type your text, adjust size/speed/color/direction (the preview strip updates live), then tap Start display. Nothing to install.

Using several phones as one screen

Open the page on every phone. On the controller phone, switch to multi-phone control: it lists the connected phones with numbers. Set the text, the start time and press start; all phones begin together, each showing its own part of the line.

Limitations

Sync depends on network latency and each phone's clock, so long runs can drift slightly — restart from the controller to re-align. It has not been tested on large numbers of real phones yet. On iOS Safari the Fullscreen API is mostly unavailable, so the page simply fills the viewport.

Privacy

Your text stays in your browser. The small control server used in multi-phone mode only relays settings and start times between your own phones; there is no account and nothing is stored.