Every PDF operation. One SDK.

using LMKit.Document.Pdf;
using LMKit.Extraction.Ocr;

// Turn a folder of scanned PDFs into searchable PDFs.
var ocr  = new LMKitOcr();   // CPU-only, fast
var maker = new PdfSearchableMaker(ocr);

foreach (var path in Directory.EnumerateFiles(@"C:\scans", "*.pdf"))
{
    await maker.MakeSearchableAsync(path, $@"C:\out\{Path.GetFileName(path)}");
}

// Output PDFs look identical and are now full-text indexable.

using LMKit.Document.Pdf;
using LMKit.TextAnalysis;

var engine = new SearchHighlightEngine(@"C:\contracts\msa.pdf");

// Find every mention and produce a highlighted PDF for the reviewer.
SearchHighlightResult r = await engine.HighlightAsync(
    query: "indemnification",
    output: @"C:\out\msa-highlighted.pdf");

Console.WriteLine($"Found {r.Matches.Count} matches across {r.Pages.Count} pages");

using LMKit.Document.Pdf;

// Merge a stack of one-pagers into a single book.
var book = PdfDocument.Merge(
    @"C:\out\book.pdf",
    @"C:\pages\01.pdf",
    @"C:\pages\02.pdf",
    @"C:\pages\03.pdf");

// Extract every embedded image, OCR the ones that need it.
using var doc = new PdfDocument(@"C:\reports\annual.pdf");
var ocr      = new EmbeddedImageOcr(new LMKitOcr());

foreach (var page in doc.Pages)
{
    await ocr.RunAsync(page);    // updates page text in-place
}