PNG size function

npm install pngsize

Function that reads the width and height of a PNG image by checking the IHDR header chunk. The function will only read the first 24 bytes of the file.

The function will also validate the PNG file signature.

var pngSize = require('pngsize');

// Async
pngSize('image.png', function (err, size) {
  console.log('size of image.png: %s x %s', size.width, size.height);
});

// Sync
var size = pngSize('image.png');
console.log('size of image.png: %s x %s', size.width, size.height);

// Read PNG data from buffer
// Note that pngSize only needs the first 24 bytes.
var buffer = fs.readFileSync('image.png');
var size = pngSize(buffer);
console.log('size of image.png: %s x %s', size.width, size.height);