dacode-dev.github.io/token-counter.html at main · dacode-dev/dacode-dev.github.io · GitHub

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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Token Counter — paste text, see the token count and what fits your model</title>
<meta name="description" content="Free browser-based token counter. Paste text or code, see the exact token count and how much of common LLM context windows it uses. No upload, runs entirely in your browser.">
<style>
  :root {
    --bg: #0b0d10;
    --card: #14171c;
    --text: #e8eaed;
    --muted: #9aa0a6;
    --accent: #6ee7b7;
    --border: #262a30;
    --code-bg: #0e1013;
    --warn: #f59e0b;
    --danger: #f87171;
  }
  @media (prefers-color-scheme: light) {
    :root {
      --bg: #f7f7f8;
      --card: #ffffff;
      --text: #16181c;
      --muted: #5f6368;
      --accent: #059669;
      --border: #e2e4e8;
      --code-bg: #f1f2f4;
      --warn: #b45309;
      --danger: #b91c1c;
    }
  }
  * { box-sizing: border-box; }
  body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    display: flex;
    justify-content: center;
    padding: 40px 20px;
  }
  .card {
    max-width: 760px;
    width: 100%;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 32px;
  }
  h1 { font-size: 1.4rem; margin: 0 0 6px; }
  p.sub { color: var(--muted); margin: 0 0 24px; font-size: 0.9rem; }
  textarea {
    width: 100%;
    min-height: 260px;
    background: var(--code-bg);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 14px;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 0.85rem;
    resize: vertical;
  }
  .stats {
    display: flex;
    gap: 24px;
    margin: 16px 0 24px;
    flex-wrap: wrap;
  }
  .stat { }
  .stat .n { font-size: 1.6rem; font-weight: 700; }
  .stat .l { font-size: 0.8rem; color: var(--muted); }
  table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.88rem;
  }
  th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); }
  th { color: var(--muted); font-weight: 600; font-size: 0.8rem; }
  .bar-wrap { width: 140px; background: var(--code-bg); border-radius: 6px; overflow: hidden; height: 8px; }
  .bar { height: 100%; background: var(--accent); }
  .bar.warn { background: var(--warn); }
  .bar.danger { background: var(--danger); }
  .pct { font-variant-numeric: tabular-nums; color: var(--muted); font-size: 0.8rem; }
  .note {
    font-size: 0.85rem;
    color: var(--muted);
    line-height: 1.5;
    border-top: 1px solid var(--border);
    padding-top: 20px;
    margin-top: 24px;
  }
  a { color: var(--accent); }
</style>
</head>
<body>
  <div class="card">
    <h1>Token Counter</h1>
    <p class="sub">Paste text or code below. Counted entirely in your browser — nothing is uploaded anywhere.</p>

    <textarea id="input" placeholder="Paste text, code, a prompt, anything..."></textarea>

    <div class="stats">
      <div class="stat"><div class="n" id="tokenCount">0</div><div class="l">tokens</div></div>
      <div class="stat"><div class="n" id="charCount">0</div><div class="l">characters</div></div>
      <div class="stat"><div class="n" id="ratio">—</div><div class="l">chars / token</div></div>
    </div>

    <table>
      <thead>
        <tr><th>Model</th><th>Context window</th><th>Usage</th><th></th></tr>
      </thead>
      <tbody id="modelRows"></tbody>
    </table>

    <div class="note">
      Uses <a href="https://www.npmjs.com/package/gpt-tokenizer">gpt-tokenizer</a> (cl100k encoding — the same tokenizer OpenAI's models use, and a close estimate for Claude and most other current models too). Context-window percentages already reserve 15% headroom for system prompt, conversation, and response — the same margin <a href="https://www.npmjs.com/package/llm-ctxpack">llm-ctxpack</a> uses when budgeting a repo pack.
      <br><br>
      Need this for a whole repo instead of pasted text? <a href="https://www.npmjs.com/package/llm-ctxpack">llm-ctxpack</a> does git-diff-aware, budget-aware repo packing with secret redaction built in: <code>npx llm-ctxpack . --budget 50000</code>.
    </div>
  </div>

  <script src="tokenizer.bundle.js"></script>
  <script>
    const MODELS = [
      { name: 'Claude (Opus / Sonnet / Haiku)', window: 200000 },
      { name: 'GPT-4o / GPT-4.1 / GPT-4 Turbo', window: 128000 },
      { name: 'GPT-3.5', window: 16000 },
      { name: 'Gemini 1.5/2.x', window: 1000000 },
      { name: 'Llama 3.1/3.2/3.3', window: 128000 },
    ];
    const HEADROOM = 0.15;

    const input = document.getElementById('input');
    const tokenCountEl = document.getElementById('tokenCount');
    const charCountEl = document.getElementById('charCount');
    const ratioEl = document.getElementById('ratio');
    const modelRows = document.getElementById('modelRows');

    function render() {
      const text = input.value;
      const chars = text.length;
      let tokens = 0;
      try {
        tokens = text.length ? window.__tokenCounters.cl100k(text) : 0;
      } catch (e) {
        tokens = 0;
      }
      tokenCountEl.textContent = tokens.toLocaleString();
      charCountEl.textContent = chars.toLocaleString();
      ratioEl.textContent = tokens > 0 ? (chars / tokens).toFixed(2) : '—';

      modelRows.innerHTML = MODELS.map(m => {
        const usable = Math.floor(m.window * (1 - HEADROOM));
        const pct = usable > 0 ? Math.min(100, (tokens / usable) * 100) : 0;
        const barClass = pct >= 90 ? 'danger' : pct >= 60 ? 'warn' : '';
        return `<tr>
          <td>${m.name}</td>
          <td>${m.window.toLocaleString()}</td>
          <td><div class="bar-wrap"><div class="bar ${barClass}" style="width:${pct}%"></div></div></td>
          <td class="pct">${pct.toFixed(1)}%</td>
        </tr>`;
      }).join('');
    }

    input.addEventListener('input', render);
    render();
  </script>
</body>
</html>