Just add your desired image size (width & height) after our URL, and you'll get a random image.
https://picsum.photos/200/300
        To get a square image, just add the size.
https://picsum.photos/200
      Get a specific image by adding /id/{image} to the start of the url.
https://picsum.photos/id/237/200/300
        You can find a list of all the images here.
Get the same random image every time based on a seed, by adding /seed/{seed} to the start of the url.
https://picsum.photos/seed/picsum/200/300
      Get a grayscale image by appending ?grayscale to the end of the url.
https://picsum.photos/200/300?grayscale
      Get a blurred image by appending ?blur to the end of the url.
https://picsum.photos/200/300/?blur
        You can adjust the amount of blur by providing a number between 1 and 10. 
https://picsum.photos/200/300/?blur=2
      You may combine any of the options above.
For example, to get a specific image that is grayscale and blurred.
https://picsum.photos/id/870/200/300?grayscale&blur=2
        To request multiple images of the same size in your browser, add the random query param to prevent the images from being cached:
<img src="https://picsum.photos/200/300?random=1">
<img src="https://picsum.photos/200/300?random=2">
        If you need a file ending, you can add .jpg to the end of the url.
https://picsum.photos/200/300.jpg
        To get an image in the WebP format, you can add .webp to the end of the url.
https://picsum.photos/200/300.webp
      Get a list of images by using the /v2/list endpoint.
https://picsum.photos/v2/list
        The API will return 30 items per page by default.
To request another page, use the ?page parameter.
To change the amount of items per page, use the ?limit parameter.
https://picsum.photos/v2/list?page=2&limit=100
        The Link header includes pagination information about the next/previous pages
[
    {
        "id": "0",
        "author": "Alejandro Escamilla",
        "width": 5616,
        "height": 3744,
        "url": "https://unsplash.com/...",
        "download_url": "https://picsum.photos/..."
    }
]
      Get information about a specific image by using the /id/{id}/info and /seed/{seed}/info endpoints.
https://picsum.photos/id/0/info
https://picsum.photos/seed/picsum/info
        You can find out the ID of an image by looking at the Picsum-ID header, or the User Comment field in the EXIF metadata.
{
        "id": "0",
        "author": "Alejandro Escamilla",
        "width": 5616,
        "height": 3744,
        "url": "https://unsplash.com/...",
        "download_url": "https://picsum.photos/..."
}