月: 2026年8月

文字数カウントサイト

<!DOCTYPE html>
<html lang="ja">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>文字数カウント</title>

  <style>
    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      min-height: 100vh;
      font-family: Arial, "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
      background: #f4f6f8;
      color: #222;
      display: flex;
      justify-content: center;
      align-items: center;
      padding: 30px;
    }

    .container {
      width: 100%;
      max-width: 900px;
      background: white;
      padding: 30px;
      border-radius: 16px;
      box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
    }

    h1 {
      margin-top: 0;
      text-align: center;
    }

    textarea {
      width: 100%;
      height: 350px;
      resize: vertical;
      padding: 18px;
      font-size: 16px;
      line-height: 1.7;
      border: 1px solid #ccc;
      border-radius: 10px;
      outline: none;
    }

    textarea:focus {
      border-color: #555;
    }

    .counts {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
      gap: 12px;
      margin-top: 20px;
    }

    .count-box {
      background: #f7f7f7;
      padding: 18px;
      border-radius: 10px;
      text-align: center;
    }

    .count-box strong {
      display: block;
      font-size: 28px;
      margin-top: 5px;
    }

    .buttons {
      margin-top: 20px;
      display: flex;
      gap: 10px;
      justify-content: center;
      flex-wrap: wrap;
    }

    button {
      border: none;
      padding: 12px 22px;
      border-radius: 8px;
      cursor: pointer;
      font-size: 15px;
      background: #222;
      color: white;
    }

    button:hover {
      opacity: 0.8;
    }
  </style>
</head>

<body>

<div class="container">

  <h1>文字数カウント</h1>

  <textarea
    id="text"
    placeholder="ここに文章を入力してください"
  ></textarea>

  <div class="counts">

    <div class="count-box">
      文字数
      <strong id="characterCount">0</strong>
    </div>

    <div class="count-box">
      空白を除く
      <strong id="noSpaceCount">0</strong>
    </div>

    <div class="count-box">
      行数
      <strong id="lineCount">0</strong>
    </div>

  </div>

  <div class="buttons">

    <button id="copyButton">
      コピー
    </button>

    <button id="clearButton">
      すべて削除
    </button>

  </div>

</div>

<script>

const textArea = document.getElementById("text");

const characterCount =
document.getElementById("characterCount");

const noSpaceCount =
document.getElementById("noSpaceCount");

const lineCount =
document.getElementById("lineCount");

const copyButton =
document.getElementById("copyButton");

const clearButton =
document.getElementById("clearButton");


function countText() {

  const text = textArea.value;

  // 全文字数
  characterCount.textContent = text.length;

  // 空白・改行を除いた文字数
  noSpaceCount.textContent =
    text.replace(/\s/g, "").length;

  // 行数
  if (text.length === 0) {

    lineCount.textContent = 0;

  } else {

    lineCount.textContent =
      text.split("\n").length;

  }

}


textArea.addEventListener(
  "input",
  countText
);


copyButton.addEventListener(
  "click",
  async () => {

    await navigator.clipboard.writeText(
      textArea.value
    );

    copyButton.textContent =
      "コピーしました";

    setTimeout(() => {

      copyButton.textContent =
        "コピー";

    }, 1500);

  }
);


clearButton.addEventListener(
  "click",
  () => {

    textArea.value = "";

    countText();

    textArea.focus();

  }
);


</script>

</body>
</html>