100 Free AI UI Components

Prompt with Token Counter

Estimates how many tokens a prompt will use as people type, with a bar that turns orange and then red near the limit.

Download the fileOpen full screen

One HTML file with the CSS and JavaScript inside. No library needed. MIT license.

Live preview

How to use it

  1. Click Copy the code, or download the file.
  2. Paste the CSS into your stylesheet, the HTML where you want the component, and the script before the closing body tag.
  3. Change --accent at the top of the CSS to your brand color, then connect the events to your AI service.

What you get

  • Works in light and dark mode automatically
  • Keyboard friendly, with labels for screen readers
  • Fits phones, tablets and desktops
  • Respects the reduced motion setting
  • No framework, so it works with any stack

The code

<!DOCTYPE html>
<!--
  Prompt with Token Counter: a free AI UI component
  From 100 Free AI UI Components by MM Rahman Bappi, MIT license
  https://mmrahmanbappi.github.io/100-free-ai-ui-components/

  How to use: copy the CSS, HTML and JavaScript below into your page.
  Colors are CSS variables at the top. Change --accent to match your brand.
  Light and dark themes follow the visitor's system setting, or set
  data-theme="dark" or data-theme="light" on the html element.
-->
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Prompt with Token Counter | Free AI UI Component</title>
<meta name="description" content="Estimates how many tokens a prompt will use as people type, with a bar that turns orange and then red near the limit.">
<meta name="robots" content="noindex, follow">
<style>
:root{
  --accent:#5b5bd6; --accent-ink:#fff; --accent-soft:#ececfc;
  --bg:#f7f7f8; --surface:#fff; --surface-2:#f1f1f4; --ink:#17171c; --text:#3a3a44; --muted:#6c6c78;
  --line:#e3e3e8; --good:#15803d; --warn:#b45309; --bad:#c62828;
  --radius:14px; --shadow:0 1px 2px rgba(20,20,30,.06),0 8px 24px -12px rgba(20,20,30,.18);
  --font:system-ui,-apple-system,"Segoe UI",Roboto,Ubuntu,sans-serif; --mono:ui-monospace,"Cascadia Code",Menlo,Consolas,monospace;
}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]){
  --accent:#8b8bff; --accent-ink:#0f0f16; --accent-soft:#25254a;
  --bg:#0f0f13; --surface:#18181f; --surface-2:#212129; --ink:#f3f3f6; --text:#d4d4dc; --muted:#9a9aa8;
  --line:#2c2c36; --good:#4ade80; --warn:#fbbf24; --bad:#f87171; --shadow:0 1px 2px rgba(0,0,0,.4),0 10px 30px -12px rgba(0,0,0,.6);
}}
:root[data-theme=dark]{
  --accent:#8b8bff; --accent-ink:#0f0f16; --accent-soft:#25254a;
  --bg:#0f0f13; --surface:#18181f; --surface-2:#212129; --ink:#f3f3f6; --text:#d4d4dc; --muted:#9a9aa8;
  --line:#2c2c36; --good:#4ade80; --warn:#fbbf24; --bad:#f87171; --shadow:0 1px 2px rgba(0,0,0,.4),0 10px 30px -12px rgba(0,0,0,.6);
}
*{box-sizing:border-box}
html,body{margin:0}
body{min-height:100vh;display:grid;grid-template-columns:minmax(0,1fr);place-items:center;padding:24px;background:var(--bg);color:var(--text);font:15px/1.5 var(--font);-webkit-font-smoothing:antialiased}
button,input,textarea,select{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
[hidden]{display:none!important}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition:none!important}}
/* ---- component ---- */
.pb{width:min(100%,680px);background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:10px 10px 10px 14px;transition:border-color .15s}
.pb:focus-within{border-color:var(--accent)}
.pb textarea{width:100%;border:0;outline:0;resize:none;background:none;min-height:24px;max-height:200px;line-height:1.5;padding:6px 0;color:var(--ink)}
.pb textarea::placeholder{color:var(--muted)}
.row{display:flex;align-items:center;gap:8px;min-width:0}
.row>span{min-width:0}
.sp{flex:1}
.ib{width:36px;height:36px;display:grid;place-items:center;border-radius:10px;border:0;background:none;color:var(--muted);cursor:pointer}
.ib:hover{background:var(--surface-2);color:var(--ink)}
.send{width:36px;height:36px;display:grid;place-items:center;border-radius:10px;border:0;background:var(--accent);color:var(--accent-ink);cursor:pointer;transition:opacity .15s,transform .1s}
.send:disabled{opacity:.35;cursor:not-allowed}
.send:not(:disabled):active{transform:scale(.94)}
.log{width:min(100%,680px);margin-bottom:12px;display:flex;flex-direction:column;gap:8px}
.msg{align-self:flex-end;max-width:85%;background:var(--accent-soft);color:var(--ink);padding:9px 13px;border-radius:14px 14px 4px 14px;white-space:pre-wrap;word-wrap:break-word;animation:pop .2s ease}
@keyframes pop{from{opacity:0;transform:translateY(6px)}}
.wrap{width:min(100%,680px);display:flex;flex-direction:column;align-items:stretch}
.meter{display:flex;align-items:center;gap:10px;font-size:12.5px;color:var(--muted);font-variant-numeric:tabular-nums}
.bar{width:110px;height:6px;border-radius:99px;background:var(--surface-2);overflow:hidden}
.bar i{display:block;height:100%;width:0;background:var(--accent);border-radius:99px;transition:width .15s,background .15s}
.meter.near .bar i{background:var(--warn)}.meter.over .bar i{background:var(--bad)}.meter.over{color:var(--bad);font-weight:600}
.tip{font-size:12px;color:var(--muted);margin:8px 0 0;text-align:center}
</style>
</head>
<body>
<div class="wrap">
  <form class="pb" id="f">
    <label class="sr" for="q">Message</label>
    <textarea id="q" rows="3" placeholder="Paste a long text to see how many tokens it uses"></textarea>
    <div class="row">
      <div class="meter" id="m" aria-live="polite"><span class="bar"><i id="b"></i></span><span id="n">0 / 1,000 tokens</span></div>
      <span class="sp"></span><button class="send" id="s" type="submit" aria-label="Send message" disabled><svg viewBox="0 0 24 24" width="18" height="18" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M12 19V5M5 12l7-7 7 7"/></svg></button>
    </div>
  </form>
  <p class="tip">The count is an estimate: about 4 characters per token for English text.</p>
</div>
<script>
// Demo helper: add ?theme=dark or ?theme=light to the address to preview a theme.
(function(){var t=new URLSearchParams(location.search).get('theme');if(t)document.documentElement.dataset.theme=t;})();
function grow(t){t.style.height='auto';t.style.height=Math.min(t.scrollHeight,200)+'px'}
function post(log,text){var m=document.createElement('div');m.className='msg';m.textContent=text;log.appendChild(m);}
var q=document.getElementById('q'),m=document.getElementById('m'),b=document.getElementById('b'),n=document.getElementById('n'),s=document.getElementById('s'),LIMIT=1000;
function est(t){if(!t.trim())return 0;var words=t.trim().split(/\s+/).length;return Math.max(Math.ceil(t.length/4),Math.ceil(words*1.3));}
q.addEventListener('input',function(){grow(q);var k=est(q.value),p=Math.min(k/LIMIT,1);b.style.width=(p*100)+'%';
  n.textContent=k.toLocaleString()+' / '+LIMIT.toLocaleString()+' tokens';m.className='meter'+(k>LIMIT?' over':k>LIMIT*.8?' near':'');
  s.disabled=!q.value.trim()||k>LIMIT;});
document.getElementById('f').addEventListener('submit',function(e){e.preventDefault();q.value='';q.dispatchEvent(new Event('input'));});
</script>
</body>
</html>

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