Please let me know if there is a way to automatically compress the uploaded photo.

To everyone with knowledge

I posted it yesterday, but I thought it might be a misleading question, so I will post it again.

We are currently receiving a request and consultation from a certain customer for a proposal for an application reception system.
(Our company has the business know-how, and this is a request for a proposal based on the evaluation.)

from the customer ·You will need a certificate of identification (license, my card, etc.) to apply for the service.
　Therefore, please send an image file of the identification certificate from the application reception site
　I want to upload it.
·In many cases, the identification form is supposed to be taken with a smartphone, but
　Recently, the camera function of the smartphone has improved, and the capacity of the image file is large
　There is a tendency to
　On the other hand, enable the capacity of the hard drive on the server running the system
　I want to use it.
　Therefore, I want to compress the uploaded image file and save the HDD.
　(Using a compression tool to manually compress the application for the previous day seems to be unpleasant.)

The above request has been made.
　　　*Personally, even if I compress the image file, the file capacity will not be dramatically reduced.
　　　　I think...

To meet your needs,
1. Automatic compression server side transmission when uploading files on the application web screen.
　　(Development of application web screen using HTML+Javascript Or HTML+PHP?)

2. Compress the sent image file on the server side
　　(Create PG to compress image files using Java.
　　　Register the PG you created in a time schedule and run it automatically)

I can think of the above two things.

I'm guessing that 1 will be difficult to realize.
As for 2, I found the following example for reference using ImageIO as a compressed PG online.

public static byte[]resize (final byte[]) src, final double scale)throws IOException
{
    try(ByteArrayInputStream is=newByteArrayInputStream(src);
        ByteArrayOutputStreamos = new ByteArrayOutputStream()) {
            BufferedImage srcImage=ImageIO.read(is);
            BufferedImage destImage=resizeImage(srcImage, scale);

            // Storage quality will be "75"
            ImageIO.write(destImage, "jpeg", os);
            returnos.toByteArray();
        }
}

I understand that you cannot specify the preservation quality, but it is for identification, so
I don't think it will be a problem.

[Question]
The preface is longer, but
·Please let me know if there is a good way about 1.
·Please let me know if there is a good PG for 2.
·Please let me know if there are any other methods besides 1 and 2.

Thank you for your cooperation.