Ways to add text without bloating file-size?

[Christoph-Wagner]

Is there any way to add text with PDFSharp that doesn’t bloat the file size?
I created a PDF with 144 pages and

Heading

Text for reasons

on every page.

Then I wanted to write "short text marker" on the bottom of every page.
Unmodified file: 43.9 KB
Using StirlingPDF: 47.2 KB
Using PDF Sharp 6.2-preview: 154 KB

testdoc-Stirling.pdf
testdoc-PDFSharp.pdf
testdoc.pdf

I also tested this with older PDFSharp versions, and the current one with GDI instead of Core, no changes. All done in release mode.

The relevant code:

var gfx = XGraphics.FromPdfPage(page);
    var font = new XFont("Times New Roman", 8, XFontStyleEx.Bold);
    gfx.DrawString("short text marker", font, XBrushes.DarkGray,
        new XRect(0, 0, page.Width.Point, page.Height.Point - 30), XStringFormats.BottomCenter);

I also tried

document.Options.FlateEncodeMode = PdfFlateEncodeMode.BestCompression;
document.Options.UseFlateDecoderForJpegImages = PdfUseFlateDecoderForJpegImages.Automatic;

which didn’t help.

Originally I tried this on a more complicated 320 pages 29.7 MB e-book (which I can’t share for copyright reasons), that got bloated to 41.6 MB.

[ThomasHoevel]

PDFsharp cannot write object streams, so currently all object streams will be decompressed when opening a PDF file. This can lead to larger PDF files.
Unreferenced objects will be removed. This can lead to smaller PDF files.
When adding new text, new font objects will be added. Fonts will be added once, no matter how many pages you change in one session.

Running a PDF compressor after changing PDF files with PDFsharp may reduce file size if the optimzer can create object streams and maybe even merge fonts.