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Add direct image download to pdf-to-png

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This commit is contained in:
Sebastian Espei
2026-03-09 16:46:17 +01:00
parent 22ff7f435c
commit 65f99f0646
2 changed files with 186 additions and 148 deletions
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332
src/js/logic/pdf-to-png-page.ts
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@@ -1,193 +1,231 @@
import { showLoader, hideLoader, showAlert } from '../ui.js'; import { showLoader, hideLoader, showAlert } from '../ui.js';
import { downloadFile, formatBytes, readFileAsArrayBuffer, getPDFDocument } from '../utils/helpers.js'; import {
downloadFile,
formatBytes,
readFileAsArrayBuffer,
getPDFDocument,
getCleanPdfFilename,
} from '../utils/helpers.js';
import { createIcons, icons } from 'lucide'; import { createIcons, icons } from 'lucide';
import JSZip from 'jszip'; import JSZip from 'jszip';
import * as pdfjsLib from 'pdfjs-dist'; import * as pdfjsLib from 'pdfjs-dist';
import { PDFPageProxy } from 'pdfjs-dist';
pdfjsLib.GlobalWorkerOptions.workerSrc = new URL('pdfjs-dist/build/pdf.worker.min.mjs', import.meta.url).toString(); pdfjsLib.GlobalWorkerOptions.workerSrc = new URL(
'pdfjs-dist/build/pdf.worker.min.mjs',
import.meta.url
).toString();
let files: File[] = []; let files: File[] = [];
const updateUI = () => { const updateUI = () => {
const fileDisplayArea = document.getElementById('file-display-area'); const fileDisplayArea = document.getElementById('file-display-area');
const optionsPanel = document.getElementById('options-panel'); const optionsPanel = document.getElementById('options-panel');
const dropZone = document.getElementById('drop-zone'); const dropZone = document.getElementById('drop-zone');
if (!fileDisplayArea || !optionsPanel || !dropZone) return; if (!fileDisplayArea || !optionsPanel || !dropZone) return;
fileDisplayArea.innerHTML = ''; fileDisplayArea.innerHTML = '';
if (files.length > 0) { if (files.length > 0) {
optionsPanel.classList.remove('hidden'); optionsPanel.classList.remove('hidden');
files.forEach((file) => { files.forEach((file) => {
const fileDiv = document.createElement('div'); const fileDiv = document.createElement('div');
fileDiv.className = 'flex items-center justify-between bg-gray-700 p-3 rounded-lg text-sm'; fileDiv.className =
'flex items-center justify-between bg-gray-700 p-3 rounded-lg text-sm';
const infoContainer = document.createElement('div'); const infoContainer = document.createElement('div');
infoContainer.className = 'flex flex-col overflow-hidden'; infoContainer.className = 'flex flex-col overflow-hidden';
const nameSpan = document.createElement('div'); const nameSpan = document.createElement('div');
nameSpan.className = 'truncate font-medium text-gray-200 text-sm mb-1'; nameSpan.className = 'truncate font-medium text-gray-200 text-sm mb-1';
nameSpan.textContent = file.name; nameSpan.textContent = file.name;
const metaSpan = document.createElement('div'); const metaSpan = document.createElement('div');
metaSpan.className = 'text-xs text-gray-400'; metaSpan.className = 'text-xs text-gray-400';
metaSpan.textContent = `${formatBytes(file.size)} • Loading pages...`; // Initial state metaSpan.textContent = `${formatBytes(file.size)} • Loading pages...`; // Initial state
infoContainer.append(nameSpan, metaSpan); infoContainer.append(nameSpan, metaSpan);
const removeBtn = document.createElement('button'); const removeBtn = document.createElement('button');
removeBtn.className = 'ml-4 text-red-400 hover:text-red-300 flex-shrink-0'; removeBtn.className =
removeBtn.innerHTML = '<i data-lucide="trash-2" class="w-4 h-4"></i>'; 'ml-4 text-red-400 hover:text-red-300 flex-shrink-0';
removeBtn.onclick = () => { removeBtn.innerHTML = '<i data-lucide="trash-2" class="w-4 h-4"></i>';
files = []; removeBtn.onclick = () => {
updateUI(); files = [];
}; updateUI();
};
fileDiv.append(infoContainer, removeBtn); fileDiv.append(infoContainer, removeBtn);
fileDisplayArea.appendChild(fileDiv); fileDisplayArea.appendChild(fileDiv);
// Fetch page count asynchronously // Fetch page count asynchronously
readFileAsArrayBuffer(file).then(buffer => { readFileAsArrayBuffer(file)
return getPDFDocument(buffer).promise; .then((buffer) => {
}).then(pdf => { return getPDFDocument(buffer).promise;
metaSpan.textContent = `${formatBytes(file.size)} • ${pdf.numPages} page${pdf.numPages !== 1 ? 's' : ''}`; })
}).catch(e => { .then((pdf) => {
console.warn('Error loading PDF page count:', e); metaSpan.textContent = `${formatBytes(file.size)} • ${pdf.numPages} page${pdf.numPages !== 1 ? 's' : ''}`;
metaSpan.textContent = formatBytes(file.size); })
}); .catch((e) => {
console.warn('Error loading PDF page count:', e);
metaSpan.textContent = formatBytes(file.size);
}); });
});
// Initialize icons immediately after synchronous render // Initialize icons immediately after synchronous render
createIcons({ icons }); createIcons({ icons });
} else { } else {
optionsPanel.classList.add('hidden'); optionsPanel.classList.add('hidden');
} }
}; };
const resetState = () => { const resetState = () => {
files = []; files = [];
const fileInput = document.getElementById('file-input') as HTMLInputElement; const fileInput = document.getElementById('file-input') as HTMLInputElement;
if (fileInput) fileInput.value = ''; if (fileInput) fileInput.value = '';
const scaleSlider = document.getElementById('png-scale') as HTMLInputElement; const scaleSlider = document.getElementById('png-scale') as HTMLInputElement;
const scaleValue = document.getElementById('png-scale-value'); const scaleValue = document.getElementById('png-scale-value');
if (scaleSlider) scaleSlider.value = '2.0'; if (scaleSlider) scaleSlider.value = '2.0';
if (scaleValue) scaleValue.textContent = '2.0x'; if (scaleValue) scaleValue.textContent = '2.0x';
updateUI(); updateUI();
}; };
async function convert() { async function convert() {
if (files.length === 0) { if (files.length === 0) {
showAlert('No File', 'Please upload a PDF file first.'); showAlert('No File', 'Please upload a PDF file first.');
return; return;
} }
showLoader('Converting to PNG...'); showLoader('Converting to PNG...');
try { try {
const pdf = await getPDFDocument( const pdf = await getPDFDocument(await readFileAsArrayBuffer(files[0]))
await readFileAsArrayBuffer(files[0]) .promise;
).promise;
const zip = new JSZip();
const scaleInput = document.getElementById('png-scale') as HTMLInputElement; const scaleInput = document.getElementById('png-scale') as HTMLInputElement;
const scale = scaleInput ? parseFloat(scaleInput.value) : 2.0; const scale = scaleInput ? parseFloat(scaleInput.value) : 2.0;
for (let i = 1; i <= pdf.numPages; i++) { if (pdf.numPages === 1) {
const page = await pdf.getPage(i); const page = await pdf.getPage(1);
const viewport = page.getViewport({ scale }); const blob = await renderPage(page, scale);
const canvas = document.createElement('canvas'); downloadFile(blob, getCleanPdfFilename(files[0].name) + '.png');
const context = canvas.getContext('2d'); } else {
canvas.height = viewport.height; const zip = new JSZip();
canvas.width = viewport.width; for (let i = 1; i <= pdf.numPages; i++) {
const page = await pdf.getPage(i);
await page.render({ canvasContext: context!, viewport: viewport, canvas }).promise; const blob = await renderPage(page, scale);
if (blob) {
const blob = await new Promise<Blob | null>((resolve) => zip.file(`page_${i}.png`, blob);
canvas.toBlob(resolve, 'image/png')
);
if (blob) {
zip.file(`page_${i}.png`, blob);
}
} }
}
const zipBlob = await zip.generateAsync({ type: 'blob' }); const zipBlob = await zip.generateAsync({ type: 'blob' });
downloadFile(zipBlob, 'converted_images.zip'); downloadFile(zipBlob, getCleanPdfFilename(files[0].name) + '_pngs.zip');
showAlert('Success', 'PDF converted to PNGs successfully!', 'success', () => {
resetState();
});
} catch (e) {
console.error(e);
showAlert(
'Error',
'Failed to convert PDF to PNG. The file might be corrupted.'
);
} finally {
hideLoader();
} }
showAlert(
'Success',
'PDF converted to PNGs successfully!',
'success',
() => {
resetState();
}
);
} catch (e) {
console.error(e);
showAlert(
'Error',
'Failed to convert PDF to PNG. The file might be corrupted.'
);
} finally {
hideLoader();
}
}
async function renderPage(
page: PDFPageProxy,
scale: number
): Promise<Blob | null> {
const viewport = page.getViewport({ scale });
const canvas = document.createElement('canvas');
const context = canvas.getContext('2d');
canvas.height = viewport.height;
canvas.width = viewport.width;
await page.render({
canvasContext: context!,
viewport: viewport,
canvas,
}).promise;
const blob = await new Promise<Blob | null>((resolve) =>
canvas.toBlob(resolve, 'image/png')
);
return blob;
} }
document.addEventListener('DOMContentLoaded', () => { document.addEventListener('DOMContentLoaded', () => {
const fileInput = document.getElementById('file-input') as HTMLInputElement; const fileInput = document.getElementById('file-input') as HTMLInputElement;
const dropZone = document.getElementById('drop-zone'); const dropZone = document.getElementById('drop-zone');
const processBtn = document.getElementById('process-btn'); const processBtn = document.getElementById('process-btn');
const backBtn = document.getElementById('back-to-tools'); const backBtn = document.getElementById('back-to-tools');
const scaleSlider = document.getElementById('png-scale') as HTMLInputElement; const scaleSlider = document.getElementById('png-scale') as HTMLInputElement;
const scaleValue = document.getElementById('png-scale-value'); const scaleValue = document.getElementById('png-scale-value');
if (backBtn) { if (backBtn) {
backBtn.addEventListener('click', () => { backBtn.addEventListener('click', () => {
window.location.href = import.meta.env.BASE_URL; window.location.href = import.meta.env.BASE_URL;
}); });
}
if (scaleSlider && scaleValue) {
scaleSlider.addEventListener('input', () => {
scaleValue.textContent = `${parseFloat(scaleSlider.value).toFixed(1)}x`;
});
}
const handleFileSelect = (newFiles: FileList | null) => {
if (!newFiles || newFiles.length === 0) return;
const validFiles = Array.from(newFiles).filter(
(file) => file.type === 'application/pdf'
);
if (validFiles.length === 0) {
showAlert('Invalid File', 'Please upload a PDF file.');
return;
} }
if (scaleSlider && scaleValue) { files = [validFiles[0]];
scaleSlider.addEventListener('input', () => { updateUI();
scaleValue.textContent = `${parseFloat(scaleSlider.value).toFixed(1)}x`; };
});
}
const handleFileSelect = (newFiles: FileList | null) => { if (fileInput && dropZone) {
if (!newFiles || newFiles.length === 0) return; fileInput.addEventListener('change', (e) => {
const validFiles = Array.from(newFiles).filter( handleFileSelect((e.target as HTMLInputElement).files);
(file) => file.type === 'application/pdf' });
);
if (validFiles.length === 0) { dropZone.addEventListener('dragover', (e) => {
showAlert('Invalid File', 'Please upload a PDF file.'); e.preventDefault();
return; dropZone.classList.add('bg-gray-700');
} });
files = [validFiles[0]]; dropZone.addEventListener('dragleave', (e) => {
updateUI(); e.preventDefault();
}; dropZone.classList.remove('bg-gray-700');
});
if (fileInput && dropZone) { dropZone.addEventListener('drop', (e) => {
fileInput.addEventListener('change', (e) => { e.preventDefault();
handleFileSelect((e.target as HTMLInputElement).files); dropZone.classList.remove('bg-gray-700');
}); handleFileSelect(e.dataTransfer?.files ?? null);
});
dropZone.addEventListener('dragover', (e) => { fileInput.addEventListener('click', () => {
e.preventDefault(); fileInput.value = '';
dropZone.classList.add('bg-gray-700'); });
}); }
dropZone.addEventListener('dragleave', (e) => { if (processBtn) {
e.preventDefault(); processBtn.addEventListener('click', convert);
dropZone.classList.remove('bg-gray-700'); }
});
dropZone.addEventListener('drop', (e) => {
e.preventDefault();
dropZone.classList.remove('bg-gray-700');
handleFileSelect(e.dataTransfer?.files ?? null);
});
fileInput.addEventListener('click', () => {
fileInput.value = '';
});
}
if (processBtn) {
processBtn.addEventListener('click', convert);
}
}); });

2
src/pages/pdf-to-png.html
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@@ -187,7 +187,7 @@
</div> </div>
<button id="process-btn" class="btn-gradient w-full"> <button id="process-btn" class="btn-gradient w-full">
Download All as ZIP Download All
</button> </button>
</div> </div>
</div> </div>