How do I change the page size on Mac without cropping now that Apple has removed the Acrobat PDF Printer?

One solution could be to ensure all content fits within the adjusted page boundaries before applying the transformation:

1. Retrieve the page’s CropBox, MediaBox, or ArtBox.
2. Adjust these boxes to accommodate the scaled content.
3. Reapply the transformation.

If this is not the solution, and you would like to go forward with the C++ codes using Adobe PDF Library, you can follow the below steps:

1. Initialize the APDFL environment.

• Set up the library and open the document.

   

2. Apply Transformation Matrix:

• Retrieve the page and its associated content.
• Apply a scaling transformation matrix using PDPageSetMatrix or equivalent.

   

3. Adjust Page Boundaries:

• Modify the CropBox, MediaBox, or other bounding boxes to ensure all content is visible.

4. Flatten Page Content:

• Flatten the page to ensure annotations and other content are properly integrated into the page.

5. Save Changes:

• Save the modified document.

 A sample code for the workflow:

#include "PDFL.h"
#include <iostream>

void resizePDFPage(const char* inputFile, const char* outputFile, double scaleFactor) {
    // Initialize APDFL
    APDFLib lib;
    if (!lib.isValid()) {
        std::cerr << "Failed to initialize APDFL." << std::endl;
        return;
    }

    // Open the document
    ASPathName pathName = ASFileSysCreatePathName(NULL, ASAtomFromString("Cstring"), inputFile, NULL);
    PDDoc pdDoc = PDDocOpen(pathName, NULL, NULL, true);
    if (!pdDoc) {
        std::cerr << "Failed to open PDF document." << std::endl;
        return;
    }

    // Get the first page (or loop through pages)
    PDPage pdPage = PDDocAcquirePage(pdDoc, 0);

    // Get page dimensions
    ASFixedRect mediaBox;
    PDPageGetMediaBox(pdPage, &mediaBox);

    // Calculate new dimensions
    double width = ASFixedToFloat(mediaBox.right - mediaBox.left) * scaleFactor;
    double height = ASFixedToFloat(mediaBox.top - mediaBox.bottom) * scaleFactor;

    // Set transformation matrix
    ASFixedMatrix matrix = {
        ASFloatToFixed(scaleFactor), 0, 0,
        ASFloatToFixed(scaleFactor), 0, 0
    };
    PDPageSetMatrix(pdPage, &matrix);

    // Adjust MediaBox to match new dimensions
    mediaBox.right = mediaBox.left + ASFloatToFixed(width);
    mediaBox.top = mediaBox.bottom + ASFloatToFixed(height);
    PDPageSetMediaBox(pdPage, &mediaBox);

    // Save the document
    PDDocSave(pdDoc, PDSaveFull, ASAtomFromString(outputFile), NULL, NULL, NULL);

    // Cleanup
    PDPageRelease(pdPage);
    PDDocClose(pdDoc);
    ASFileSysReleasePath(pathName);
}

int main() {
    const char* inputFile = "input.pdf";
    const char* outputFile = "output.pdf";
    double scaleFactor = 1.5; // Scale by 150%
    resizePDFPage(inputFile, outputFile, scaleFactor);
    return 0;
}

Note: I am not an expert on codes, and this may or may not work. This is just a trial I did on my end.

Hope this helps.

-Souvik