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Free JPG to PNG Converter — Studio Quality

Files never leave your device. No watermark, no sign-in, no limits.

Drop JPG files here or click to upload

Up to 20 images • Processed locally in your browser

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Why use pngpro?

pngpro is a free online JPG to PNG converter that runs entirely in your browser. Your images are never uploaded to a server, which means complete privacy and instant conversion. Whether you need transparent backgrounds, lossless quality, or just a different format, pngpro delivers studio-quality PNGs with zero watermarks and no sign-up required.

Frequently Asked Questions

pngpro — Convert JPG to PNG free, fast, and private.

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`; // FAQ data const faqs = [ { q: "Is pngpro really free?", a: "Yes. pngpro is 100% free with no hidden costs, no subscription, and no watermark on your converted images." }, { q: "Do my files get uploaded to a server?", a: "No. All conversion happens locally in your browser using HTML Canvas. Your files never leave your device, ensuring complete privacy." }, { q: "How many images can I convert at once?", a: "You can convert up to 20 JPG images at once. Each is processed instantly and can be downloaded individually or all together as a ZIP file." }, { q: "Will the PNG quality be the same as the JPG?", a: "PNG is a lossless format, so your converted image preserves all visual detail from the source JPG with no additional compression artifacts." }, ]; document.getElementById('faq').innerHTML = faqs.map((f, i) => `
${f.q}

${f.a}

`).join(''); // Converter logic const MAX_FILES = 20; const dropZone = document.getElementById('dropZone'); const fileInput = document.getElementById('fileInput'); const results = document.getElementById('results'); const actions = document.getElementById('actions'); const downloadAllBtn = document.getElementById('downloadAllBtn'); const clearBtn = document.getElementById('clearBtn'); let converted = []; // { name, pngUrl, beforeKB, afterKB } const formatKB = (bytes) => (bytes / 1024).toFixed(1) + ' KB'; dropZone.addEventListener('click', () => fileInput.click()); dropZone.addEventListener('dragover', (e) => { e.preventDefault(); dropZone.classList.add('dragover'); }); dropZone.addEventListener('dragleave', () => dropZone.classList.remove('dragover')); dropZone.addEventListener('drop', (e) => { e.preventDefault(); dropZone.classList.remove('dragover'); handleFiles(e.dataTransfer.files); }); fileInput.addEventListener('change', (e) => handleFiles(e.target.files)); function handleFiles(fileList) { const files = Array.from(fileList).filter(f => /image\/jpe?g/i.test(f.type)).slice(0, MAX_FILES); if (files.length === 0) return; results.innerHTML = ''; converted = []; files.forEach((file, idx) => convertFile(file, idx, files.length)); } function convertFile(file, idx, total) { const id = `item-${idx}`; results.insertAdjacentHTML('beforeend', `

${file.name}

${formatKB(file.size)} → converting…

`); const reader = new FileReader(); reader.onload = (e) => { const img = new Image(); img.onload = () => { const canvas = document.createElement('canvas'); canvas.width = img.naturalWidth; canvas.height = img.naturalHeight; const ctx = canvas.getContext('2d'); ctx.drawImage(img, 0, 0); canvas.toBlob((blob) => { if (!blob) return; const pngUrl = URL.createObjectURL(blob); const baseName = file.name.replace(/\.[^.]+$/, ''); converted.push({ name: baseName + '.png', pngUrl, beforeKB: file.size, afterKB: blob.size }); const item = document.getElementById(id); item.innerHTML = ` preview

${baseName}.png

${formatKB(file.size)} → ${formatKB(blob.size)}

Download `; if (converted.length === total) { actions.classList.remove('hidden'); actions.classList.add('flex'); } }, 'image/png'); }; img.src = e.target.result; }; reader.readAsDataURL(file); } downloadAllBtn.addEventListener('click', async () => { if (converted.length === 0) return; const zip = new JSZip(); for (const item of converted) { const res = await fetch(item.pngUrl); const buf = await res.arrayBuffer(); zip.file(item.name, buf); } const content = await zip.generateAsync({ type: 'blob' }); const url = URL.createObjectURL(content); const a = document.createElement('a'); a.href = url; a.download = 'pngpro-converted.zip'; a.click(); URL.revokeObjectURL(url); }); clearBtn.addEventListener('click', () => { converted.forEach(c => URL.revokeObjectURL(c.pngUrl)); converted = []; results.innerHTML = ''; actions.classList.add('hidden'); actions.classList.remove('flex'); fileInput.value = ''; });