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Node module for detecting image dimensions
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A Node module to get dimensions of any image file

Supported formats

  • BMP
  • CUR
  • DDS
  • GIF
  • ICNS
  • ICO
  • JPEG
  • KTX
  • PNG
  • PSD
  • SVG
  • TIFF
  • WebP

Programmatic Usage

npm install image-size --save


var sizeOf = require('image-size');
var dimensions = sizeOf('images/funny-cats.png');
console.log(dimensions.width, dimensions.height);


var sizeOf = require('image-size');
sizeOf('images/funny-cats.png', function (err, dimensions) {
  console.log(dimensions.width, dimensions.height);

NOTE: The asynchronous version doesn't work if the input is a Buffer. Use synchronous version instead.

Also, the asynchronous functions have a default concurreny limit of 100 To change this limit, you can call the setConcurrency function like this:

var sizeOf = require('image-size');

Using promises (node 8.x)

var { promisify } = require('util');
var sizeOf = promisify(require('image-size'));
  .then(dimensions => { console.log(dimensions.width, dimensions.height); })
  .catch(err => console.error(err));

Async/Await (Typescript & ES7)

var { promisify } = require('util');
var sizeOf = promisify(require('image-size'));
(async () => {
  try {
    const dimensions = await sizeOf('images/funny-cats.png');
    console.log(dimensions.width, dimensions.height);
  } catch (err) {
})().then(c => console.log(c));


If the target file is an icon (.ico) or a cursor (.cur), the width and height will be the ones of the first found image.

An additional images array is available and returns the dimensions of all the available images

var sizeOf = require('image-size');
var images = sizeOf('images/multi-size.ico').images;
for (const dimensions of images) {
  console.log(dimensions.width, dimensions.height);

Using a URL

var url = require('url');
var http = require('http');

var sizeOf = require('image-size');

var imgUrl = '';
var options = url.parse(imgUrl);

http.get(options, function (response) {
  var chunks = [];
  response.on('data', function (chunk) {
  }).on('end', function() {
    var buffer = Buffer.concat(chunks);

You can optionally check the buffer lengths & stop downloading the image after a few kilobytes. You don't need to download the entire image

Command-Line Usage (CLI)

npm install image-size --global
image-size image1 [image2] [image3] ...

Hosted API

We also provide a hosted API for image-size which may simplify your use case.


not a direct port, but an attempt to have something like dabble's imagesize as a node module.


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