image to pdf quality

<!DOCTYPE html>
<html>
<head>
  <title>Image to PDF Converter</title>
  <style>
    #uploadBox {
      border: 2px dashed #aaa;
      padding: 20px;
      width: 320px;
      text-align: center;
      margin: 50px auto;
      border-radius: 10px;
      transition: border-color 0.3s ease;
    }
    #uploadBox.dragover {
      border-color: #333;
    }
    #fileList {
      margin-top: 20px;
      text-align: left;
      font-family: sans-serif;
      font-size: 14px;
      max-height: 150px;
      overflow-y: auto;
    }
    .fileItem {
      margin-bottom: 5px;
    }
    #realInput {
      display: none;
    }
    #customBtn, #convertBtn {
      background-color: #eee;
      padding: 8px 14px;
      border-radius: 5px;
      cursor: pointer;
      border: 1px solid #aaa;
      margin: 5px;
      display: inline-block;
    }
  </style>
</head>
<body>

<div id="uploadBox">
  <h3>Image to PDF Converter</h3>
  <div id="customBtn">Add image</div>
  <input type="file" id="realInput" accept="image/*" multiple>
  <div id="fileList"></div>
  <div id="convertBtn">Convert to PDF</div>
  <h5>by amar</h5>
</div>

<!-- Include jsPDF library from CDN -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/jspdf/2.5.1/jspdf.umd.min.js"></script>
<script>
  const { jsPDF } = window.jspdf; // use the jsPDF namespace

  const uploadBox = document.getElementById('uploadBox');
  const realInput = document.getElementById('realInput');
  const customBtn = document.getElementById('customBtn');
  const fileList = document.getElementById('fileList');
  const convertBtn = document.getElementById('convertBtn');

  let allFiles = []; // store the selected image files

  function updateDisplay() {
    fileList.innerHTML = "";
    allFiles.forEach((file, index) => {
      let name = file.name.length > 20 ? file.name.slice(0, 20) + "..." : file.name;
      const sizeKB = (file.size / 1024).toFixed(2);
      const div = document.createElement("div");
      div.className = "fileItem";
      div.textContent = `${index + 1}. ${name} (${sizeKB} KB)`;
      fileList.appendChild(div);
    });
  }

  function addFiles(newFiles) {
    for (let i = 0; i < newFiles.length; i++) {
      allFiles.push(newFiles[i]);
    }
    updateDisplay();
  }

  customBtn.addEventListener("click", () => realInput.click());

  realInput.addEventListener("change", () => {
    addFiles(realInput.files);
    realInput.value = ""; // reset so the same file can be added again if needed
  });

  // Drag & Drop support
  uploadBox.addEventListener("dragover", (e) => {
    e.preventDefault();
    uploadBox.classList.add("dragover");
  });
  uploadBox.addEventListener("dragleave", () => {
    uploadBox.classList.remove("dragover");
  });
  uploadBox.addEventListener("drop", (e) => {
    e.preventDefault();
    uploadBox.classList.remove("dragover");
    addFiles(e.dataTransfer.files);
  });

  // Helper function: read a file as Data URL
  function readFileAsDataURL(file) {
    return new Promise((resolve, reject) => {
      const reader = new FileReader();
      reader.onload = () => resolve(reader.result);
      reader.onerror = reject;
      reader.readAsDataURL(file);
    });
  }

  // Convert images to PDF, centering each image on the page using 'SLOW' compression for better quality
  async function convertImagesToPDF() {
    if (allFiles.length === 0) {
      alert("Please add at least one image file.");
      return;
    }

    const pdf = new jsPDF(); // Create a new PDF document (default A4)

    // Get PDF page dimensions
    const pageWidth = pdf.internal.pageSize.getWidth();
    const pageHeight = pdf.internal.pageSize.getHeight();
    const margin = 10; // margin in PDF units (mm by default)

    for (let i = 0; i < allFiles.length; i++) {
      const file = allFiles[i];
      try {
        const dataUrl = await readFileAsDataURL(file);
        const img = new Image();
        await new Promise((resolve, reject) => {
          img.onload = resolve;
          img.onerror = reject;
          img.src = dataUrl;
        });

        // Calculate maximum available size for the image (accounting for margins)
        const maxImgWidth = pageWidth - 2 * margin;
        const maxImgHeight = pageHeight - 2 * margin;

        // Scale the image while preserving the aspect ratio
        let imgWidth = img.width;
        let imgHeight = img.height;
        const widthRatio = maxImgWidth / imgWidth;
        const heightRatio = maxImgHeight / imgHeight;
        const scale = Math.min(widthRatio, heightRatio);
        imgWidth *= scale;
        imgHeight *= scale;

        // Calculate position to center the image on the page
        const xPos = (pageWidth - imgWidth) / 2;
        const yPos = (pageHeight - imgHeight) / 2;

        // If not the first image, add a new page
        if (i > 0) {
          pdf.addPage();
        }
        // Add the image using JPEG format with 'SLOW' compression for improved quality.
        pdf.addImage(dataUrl, 'JPEG', xPos, yPos, imgWidth, imgHeight, null, 'SLOW');
      } catch (error) {
        console.error('Error processing file:', file.name, error);
      }
    }

    // Save the generated PDF
    pdf.save("converted.pdf");
  }

  convertBtn.addEventListener("click", convertImagesToPDF);
</script>
</body>
</html>
HTMLify

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