# image-size

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Fast, lightweight NodeJS package to get dimensions of any image file or buffer.

## Key Features
- Zero dependencies
- Supports all major image formats
- Works with both files and buffers
- Minimal memory footprint - reads only image headers
- ESM and CommonJS support
- TypeScript types included

## Supported formats

- BMP
- CUR
- DDS
- GIF
- HEIC (HEIF, AVCI, AVIF)
- ICNS
- ICO
- J2C
- JPEG-2000 (JP2)
- JPEG
- JPEG-XL
- KTX (1 and 2)
- PNG
- PNM (PAM, PBM, PFM, PGM, PPM)
- PSD
- SVG
- TGA
- TIFF
- WebP

## Installation

```shell
npm install image-size
# or
yarn add image-size
# or
pnpm add image-size
```

## Usage

### Passing in a Buffer/Uint8Array
Best for streams, network requests, or when you already have the image data in memory.

```javascript
import { imageSize } from 'image-size'
// or
const { imageSize } = require('image-size')

const dimensions = imageSize(buffer)
console.log(dimensions.width, dimensions.height)
```

### Reading from a file
Best for local files. Returns a promise.

```javascript
import { imageSizeFromFile } from 'image-size/fromFile'
// or
const { imageSizeFromFile } = require('image-size/fromFile')

const dimensions = await imageSizeFromFile('photos/image.jpg')
console.log(dimensions.width, dimensions.height)
```

Note: Reading from files has a default concurrency limit of **100**
To change this limit, you can call the `setConcurrency` function like this:

```javascript
import { setConcurrency } from 'image-size/fromFile'
// or
const { setConcurrency } = require('image-size/fromFile')
setConcurrency(123456)
```

### Reading from a file Syncronously (not recommended) ⚠️
v1.x of this library had a sync API, that internally used sync file reads.  

This isn't recommended because this blocks the node.js main thread, which reduces the performance, and prevents this library from being used concurrently.  

However if you still need to use this package syncronously, you can read the file syncronously into a buffer, and then pass the buffer to this library.  

```javascript
import { readFileSync } from 'node:fs'
import { imageSize } from 'image-size'

const buffer = readFileSync('photos/image.jpg')
const dimensions = imageSize(buffer)
console.log(dimensions.width, dimensions.height)
```

### 3. Command Line
Useful for quick checks.

```shell
npx image-size image1.jpg image2.png
```

### Multi-size

If the target file/buffer is an HEIF, an ICO, or a CUR file, the `width` and `height` will be the ones of the largest image in the set.

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

```javascript
import { imageSizeFromFile } from 'image-size/fromFile'
// or
const { imageSizeFromFile } = require('image-size/fromFile')

const { images } = await imageSizeFromFile('images/multi-size.ico')
for (const dimensions of images) {
  console.log(dimensions.width, dimensions.height)
}
```

### Using a URL

```javascript
import url from 'node:url'
import http from 'node:http'
import { imageSize } from 'image-size'

const imgUrl = 'http://my-amazing-website.com/image.jpeg'
const options = url.parse(imgUrl)

http.get(options, function (response) {
  const chunks = []
  response
    .on('data', function (chunk) {
      chunks.push(chunk)
    })
    .on('end', function () {
      const buffer = Buffer.concat(chunks)
      console.log(imageSize(buffer))
    })
})
```

### Disabling certain image types

```javascript
import { disableTypes } from 'image-size'
// or
const { disableTypes } = require('image-size')

disableTypes(['tiff', 'ico'])
```

### JPEG image orientation

If the orientation is present in the JPEG EXIF metadata, it will be returned by the function. The orientation value is a [number between 1 and 8](https://exiftool.org/TagNames/EXIF.html#:~:text=0x0112,8%20=%20Rotate%20270%20CW) representing a type of orientation.

```javascript
import { imageSizeFromFile } from 'image-size/fromFile'
// or
const { imageSizeFromFile } = require('image-size/fromFile')

const { width, height, orientation } = await imageSizeFromFile('images/photo.jpeg')
console.log(width, height, orientation)
```

# Limitations

1. **Partial File Reading**
   - Only reads image headers, not full files
   - Some corrupted images might still report dimensions

2. **SVG Limitations**
   - Only supports pixel dimensions and viewBox
   - Percentage values not supported

3. **File Access**
   - Reading from files has a default concurrency limit of 100
   - Can be adjusted using `setConcurrency()`

4. **Buffer Requirements**
   - Some formats (like TIFF) require the full header in buffer
   - Streaming partial buffers may not work for all formats

## License

MIT

## Credits

not a direct port, but an attempt to have something like
[dabble's imagesize](https://github.com/dabble/imagesize/blob/master/lib/image_size.rb) as a node module.

## [Contributors](Contributors.md)