LED Scrolling Text

A free online LED dot-matrix marquee. Type a message and watch it scroll across a glowing sign — perfect for livestreams, classrooms, parties, and shops.

Welcome to Large Text — the fullscreen text studio

What is LED Scrolling Text?

LED Scrolling Text is an online LED marquee generator. Paste or type a message and the page turns it into a row of glowing dot-matrix pixels that scrolls across the screen. No hardware, no install — just a browser tab that looks like a real LED sign.

It’s the motion-heavy cousin of the site’s other display tools: Large Text Display shows one static phrase, Fullscreen Text flips through discrete slides, and LED Scrolling Text runs a single continuous marquee. Each is tuned for a different moment — large static reading, explicit step-through, or attention-grabbing motion.

Rasterization happens in the browser: your text is painted to an offscreen canvas at a fixed pixel height, the alpha channel is thresholded into a boolean grid, and a requestAnimationFrame loop paints glowing circles for “lit” dots. Everything is client-side; nothing is uploaded.

Tips & best practices

  • Keep it short. A marquee reads best at 3–12 words. If you need a paragraph, use the Fullscreen Text tool and put one short sentence per slide.
  • Use high contrast. Amber on near-black, white on dark blue, or green on black all carry well. Avoid pastel-on-pastel; the dot-matrix look softens contrast already.
  • Pick the right density. 8 rows = retro “train station departure board”. 16 rows = balanced default. 24 rows = sharp and modern. If a character is hard to read, bump density before you bump size.
  • Test in the actual room. Projectors, TVs, and phones all render glow differently. Do a walk-through at the venue before you go live.
  • Treat it as a headline, not a subtitle. Scrolling text demands attention — don’t layer it below an important speaker or mix it with other motion graphics.
  • Fullscreen early. The marquee looks dramatically better at full size. If you’re streaming it on OBS, add the browser source fullscreened and crop to the strip you want.

How to use it

  1. 1
    Type your message Single line of text. Newlines are stripped automatically — the marquee is one continuous strip.
  2. 2
    Pick color and speed Choose dot color and background, then set Slow / Medium / Fast. Low density (8 rows) gives a chunky retro feel; high density (24) is sharper.
  3. 3
    Go fullscreen Click the fullscreen button. Press Esc to exit. The marquee pauses when the tab is hidden and resumes when it comes back.

Use Cases

  • Livestream intermission

    Add an OBS browser source pointing at this page and let a glowing marquee fill dead air between segments — "BRB", "Starting soon", or a donation ask.

  • Classroom attention strip

    Project "QUIET PLEASE", "5 MINUTES LEFT", or "PENCILS DOWN" across the whiteboard display. A scrolling LED feels more like a signal than a static slide.

  • Retail storefront

    Put a tablet in the shop window and scroll "OPEN", "BACK IN 5", or today's specials. Cheaper than an actual LED board and editable in seconds.

  • Protest and rally signs

    A phone in marquee mode becomes a glowing sign at night — amber dots read clearly from across the street.

  • Stadium and event board

    Run it on a big TV near the entrance to welcome guests, announce sponsors, or route people between rooms.

  • Warehouse and factory floor

    Show safety messages like "HARD HATS REQUIRED" or "SHIFT CHANGE 3 PM" on a spare monitor near the dock doors.

  • Trade show booth

    Loop your tagline on a tablet or monitor to pull passing attendees in without audio.

  • Office birthday or farewell

    Scrolling HAPPY BIRTHDAY ALEX or FAREWELL SAM on a meeting-room TV adds a beat of delight to a routine celebration.

Features

  • True dot-matrix rendering

    Each character is rasterized pixel-by-pixel to a grid of glowing dots, not just CSS scroll. The aesthetic is the point.

  • Configurable density

    8, 16, or 24 rows — chunky retro or sharp modern. Wider rows mean bigger characters on the same screen.

  • Color controls

    Pick any dot color and background. Default is classic amber on near-black, but green, red, and cyan are one click away.

  • Smooth speed control

    Slow, Medium, and Fast are tuned in columns-per-second, so the feel is consistent whether you're on a phone or a 4K TV.

  • Fullscreen ready

    One click sends the marquee to the full screen. Esc to exit. Tab-change and visibility are respected to save CPU.

  • Works offline after first load

    Static page, client-side rendering — no server call once cached. Good for venues with flaky Wi-Fi.

  • Nothing uploaded

    Your message never leaves the browser. All rasterization and rendering happens locally.

  • Honors reduced-motion

    If your OS requests reduced motion, the marquee scrolls at a quarter speed so it stays useful without being jarring.

Compatible Platforms

  • iPhone (Safari / Chrome)
  • Android (Chrome / Firefox)
  • iPad and Android tablets
  • Windows (Chrome / Edge / Firefox)
  • macOS (Safari / Chrome)
  • Linux
  • Smart-TV browsers
  • Chromebook
  • OBS Studio (Browser Source)

Related Tools

FAQ

Why does the text scroll continuously instead of flipping slides?
That's the whole point of an LED marquee — the motion is the attention-grabber. If you want discrete slides, use the Fullscreen Text tool instead.
Can I have multiple lines?
No — a marquee is always a single line. Newlines in your input are converted to spaces automatically. For multi-page messages, use the Fullscreen Text tool.
Does the marquee keep scrolling when I switch tabs?
No, it pauses when the tab is hidden and resumes when you return. This saves CPU and battery.
Can I use it as an OBS overlay for streaming?
Yes. Add a Browser source pointing at this page and crop to the stage area. The background color sets the "chroma" you can key out if you need a transparent overlay.
What fonts are supported?
The tool uses the browser's default monospace font. Any character the browser can render at the chosen pixel size will render as dots — Latin, CJK, and most Unicode.
Is my text sent to a server?
No. Text rasterization and scrolling are 100% client-side. The page ships no analytics on the tool's input.
How long a message can I scroll?
Hundreds of characters work smoothly. Thousands may start to skip frames at high density because the dot count grows linearly.
Why does my message look jagged at density "8 rows"?
8 rows is a retro chunky style — many characters only have 5×8 dots to work with. Pick 16 or 24 for sharper letterforms.
Can I reverse the scroll direction?
Not yet — this tool keeps to classic left-to-right marquee (text moves right-to-left). If enough people ask, direction control is a small addition.
Does it work on a phone in portrait mode?
Yes, but the stage is 16:9 so landscape looks best. In portrait, the marquee is smaller but still legible.