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Convert PNG images to JPG/JPEG format in browser
Notes:
PNG to JPG converter transforms PNG images into JPEG format. Convert lossless PNG to compressed JPEG for smaller file sizes, better web performance, and photo optimization. Ideal for reducing image size when transparency isn't needed.
Decode PNG data (inflate deflate blocks, apply filters), flatten alpha channel against background color, then encode as JPEG (color space conversion, DCT, quantization). Quality setting controls compression ratio vs quality.
PNG features lost: transparency (alpha flattened), lossless quality. JPEG benefits: much smaller files (typically 5-10x), progressive loading option. Quality setting (0-100) controls lossy compression. 80-90 is usually visually lossless.
Reduce image file sizes for faster loading.
2MB PNG → 200KB JPEGCompress images for email size limits.
Convert edited PNG photos to standard JPEG.
Reduce image storage requirements.
// Browser-based conversion with quality control
function pngToJpg(pngFile, quality = 0.85, backgroundColor = '#FFFFFF') {
return new Promise((resolve, reject) => {
const img = new Image();
const canvas = document.createElement('canvas');
const ctx = canvas.getContext('2d');
img.onload = () => {
canvas.width = img.naturalWidth;
canvas.height = img.naturalHeight;
// Fill background (for transparency)
ctx.fillStyle = backgroundColor;
ctx.fillRect(0, 0, canvas.width, canvas.height);
// Draw image on top
ctx.drawImage(img, 0, 0);
// Export as JPEG with quality
canvas.toBlob((blob) => {
resolve(blob);
}, 'image/jpeg', quality);
};
img.onerror = reject;
img.src = URL.createObjectURL(pngFile);
});
}
// Batch conversion with progress
async function batchConvert(files, quality = 0.85) {
const results = [];
for (let i = 0; i < files.length; i++) {
const blob = await pngToJpg(files[i], quality);
results.push({
original: files[i].name,
converted: blob,
originalSize: files[i].size,
newSize: blob.size,
savings: ((1 - blob.size / files[i].size) * 100).toFixed(1) + '%'
});
}
return results;
}
// Example usage
const file = document.querySelector('input[type="file"]').files[0];
const jpgBlob = await pngToJpg(file, 0.85);
console.log('Original:', file.size, 'bytes');
console.log('Converted:', jpgBlob.size, 'bytes');
console.log('Saved:', ((1 - jpgBlob.size/file.size) * 100).toFixed(1) + '%');Canvas conversion with background fill for transparency handling. Quality parameter controls compression (0.0-1.0).
Use PNG to JPG converter to reduce file sizes for web, email, or storage when transparency is not needed.
JPEG doesn't support transparency. Alpha channel is flattened against a background color (usually white). Semi-transparent areas become solid colors. Export as PNG if you need transparency.
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