Quick Start Guide

Simple PDF Loading:

// Load a PDF file
Pdf1.FileName := 'C:\Sample.pdf';
Pdf1.Active := True;
ShowMessage('Pages: ' + IntToStr(Pdf1.PageCount));

// Or load from a memory stream
var
  Stream: TMemoryStream;
begin
  Stream := TMemoryStream.Create;
  try
    Stream.LoadFromFile('C:\Sample.pdf');
    Pdf1.LoadDocument(Stream, True);
    Pdf1.Active := True;
  finally
    Stream.Free;
  end;
end;

// Go to next page
if PdfView1.PageNumber < Pdf1.PageCount then
  PdfView1.PageNumber := PdfView1.PageNumber + 1;

// Go to previous page
if PdfView1.PageNumber > 1 then
  PdfView1.PageNumber := PdfView1.PageNumber - 1;

// Extract all text from the current page
Pdf1.PageNumber := 1;
Memo1.Text := Pdf1.Text;

// Extract text from a rectangular area
var
  RectText: WString;
begin
  RectText := Pdf1.TextInRectangle(100, 100, 500, 200);
  ShowMessage(RectText);
end;

// Find text in the document
var
  Position: Integer;
begin
  Position := Pdf1.FindFirst('search term');
  if Position >= 0 then
    ShowMessage('Found at position: ' + IntToStr(Position))
  else
    ShowMessage('Not found');
end;

// Create a new PDF with text
Pdf1.CreateDocument;
Pdf1.Compressed := True; // enable stream compression
Pdf1.Active := True;
Pdf1.AddPage(0, 595, 842); // A4 size
Pdf1.AddText('Hello World!', 'Arial', 24, 100, 700, clBlack, $FF, 0.0);
Pdf1.SaveAs('C:\NewDocument.pdf');
Pdf1.Active := False;

// Set zoom level (1.0 = 100%)
PdfView1.Zoom := 1.5; // 150%

// Set display mode
PdfView1.DisplayMode := dmSingleContinuous;

// Rotate page
PdfView1.Rotation := ro90;

// Read document metadata
ShowMessage('Title: ' + Pdf1.Title);
ShowMessage('Author: ' + Pdf1.Author);
ShowMessage('Creator: ' + Pdf1.Creator);
ShowMessage('Producer: ' + Pdf1.Producer);
ShowMessage('Pages: ' + IntToStr(Pdf1.PageCount));
ShowMessage('Version: ' + IntToStr(Ord(Pdf1.PdfVersion)));

// Open a password-protected PDF
Pdf1.FileName := 'C:\Protected.pdf';
Pdf1.Password := 'mypassword';
Pdf1.Active := True;

For multi-GB PDFs or remote / database-backed sources, use LoadCustomDocument so PDFium pulls blocks on demand instead of buffering the entire file in memory:

var
  FileStream: TFileStream;
begin
  FileStream := TFileStream.Create('C:\Huge.pdf', fmOpenRead or fmShareDenyWrite);
  Pdf1.LoadCustomDocument(FileStream, True); // AOwnsStream
  Pdf1.Active := True;
end;

FitMode keeps long documents framed automatically on Resize and when the current page changes:

PdfView1.FitMode := pfmFitPage; // whole page in viewport
// pfmFitWidth — page width matches viewport width
// pfmActualSize — 100%
// pfmNone — manual zoom

// Dark-mode viewer pattern: dark scroll area, paper-white PDF page
PdfView1.Color := clBlack;
PdfView1.PageColor := clWhite;

HighlightSearchText scans the current view page and paints a HighlightColor mask over every match on each redraw:

var
  MatchCount: Integer;
begin
  PdfView1.HighlightColor := clYellow;
  MatchCount := PdfView1.HighlightSearchText('invoice');
  Status.Caption := IntToStr(MatchCount) + ' matches';
end;

// Switching to a different page clears the highlight automatically

SaveAsPdfA post-processes the base save with an incremental update that injects an XMP metadata stream, an sRGB ICC OutputIntent, and an updated document catalog:

if Pdf1.SaveAsPdfA('C:\Report.pdfa.pdf', pac1b) then
  ShowMessage('Saved PDF/A-1b');

// Check conformance of an incoming document
case Pdf1.PdfAConformance of
  pac1b: Log.Add('PDF/A-1b');
  pacNone: Log.Add('Not PDF/A');
end;