PDF Compression

Screen: Indicates that CSS rules are intended for on-screen viewing. Styles are optimized for digital screens, which typically include considerations like colors and layouts that look good on computer monitors.
Print: Instructs the browser to apply styles tailored for printed documents. This means the CSS rules are optimized for printing, ensuring readability and proper formatting when the HTML content is printed on physical media, like paper.

import {PdfDocument} from "@ironsoftware/ironpdf";

(async () => {
    // Load the existing PDF document
    const pdf = await PdfDocument.fromFile("my-content.pdf");

    // Compress images with quality parameter (1-100)
    await pdf.compressSize(60);
    // Save the compressed PDF
    await pdf.saveAs("document_compressed.pdf");

    // Compress images and scale down based on visible size in the PDF document
    await pdf.compressSize(90, true);
    // Save the scaled and compressed PDF
    await pdf.saveAs("document_scaled_compressed.pdf");
});

PDF Compression

IronPDF offers the capability to compress PDFs effectively. One of the key methods involves reducing the size of images embedded within the PDF document. This optimization process can be initiated by using the compressSize method on the PDF object.

When it comes to resizing JPEG images, the quality setting plays a crucial role. A quality setting of 100% results in minimal loss, while 1% represents very low-quality output. Typically, image quality levels of 90% and above are considered high-quality, 80%-90% falls into the medium-quality range, and 70%-80% is considered low-quality. Reducing the quality below 70% can lead to lower-quality images, but it can significantly reduce the overall file size of the PDF document.

It's recommended to experiment with different quality settings to find the right balance between image quality and file size that suits your specific requirements. The extent of quality reduction will ultimately depend on the type of input image, and some images may experience more noticeable reductions in clarity than others.