Batch image resizer

CLI tool for resizing images using sharp and optimizing jpg and png files using imagemin. The CLI tool does not require imagemagick or graphicsmagick to be installed.

Supports both single files as well as recursive file finding and processing using a glob pattern.

Installation

$ npm install

Example

Using the -s flag followed by an array of numbers one can specify (in pixels) the image sizes one wants to resize their image(s) to.

The input flag -i takes either a single parent directory or a single file. The script will recursivly find a copy all suitable input files in all child directories. The folder structure of the input folder is retained in the output folder. Please note that this does not happen in-place but rather in the output directory.

Running the following command turns

$ node ./bin/batch-image-resizer.js -i ./input -o ./output -s "[50, 500, 1000, 1500]"

This as input (root with a single image, a parent folder which has a single image and a child folder of the parent which contains a single image).

root
├── example-1.jpg
└── parent
    ├── child
    │   └── example-3.jpg
    └── example-2.jpg

Will in turn generate this as output (root with single image converted in various formats, a parent folder which contains a single image converted in various formats and a child folder of the parent which contains a single image converted in various formats).

root
├── example-1-1000w.jpg
├── example-1-1500w.jpg
├── example-1-500w.jpg
├── example-1-50w.jpg
└── parent
    ├── child
    │   ├── example-3-1000w.jpg
    │   ├── example-3-1500w.jpg
    │   ├── example-3-500w.jpg
    │   └── example-3-50w.jpg
    ├── example-2-1000w.jpg
    ├── example-2-1500w.jpg
    ├── example-2-500w.jpg
    └── example-2-50w.jpg

Alternatively one could specify a single file as input rather than a directory.

$ node ./bin/batch-image-resizer.js -i ./input/example.png -o ./output/example.png -s "[50, 500, 1000, 1500]"

Flags

Default

-v, --version [print version number]
-h, --help [print help]

Required

-i, --input [example: -i ./input/example.png] [example: -i ./input] [required]
-o, --output [example: -o ./output/example.png] [example: -o ./output] [required]

Optional

-s, --sizes [example: -s "[50, 500, 1000, 1500]"] [not required]
-f, --fit [fit to largest dimension, either width or height] [not required]
-k, --keep-name [do not rename files] [not required]

Formats

<img
    alt="Example image description"
    srcset="example-500w.jpg 500w, example-1000w.jpg 1000w, example-1500w.jpg 1500w"
    src="example-1000w.jpg"
/>
 
<picture>
    <source srcset="example-500w.webp 500w, example-1000w.webp 1000w, example-1500w.webp 1500w" type="image/webp">
    <source srcset="example-500w.jpg 500w, example-1000w.jpg 1000w, example-1500w.jpg 1500w" type="image/jpeg">
    <img src="example-500w.jpg" alt="Example image description">
</picture>

Licence

My work is released under the MIT license.