Reading PDF Font Properties with PDFium Component in Delphi
Inspect the fonts inside a PDF from Delphi with PDFium Component: read a glyph's family name, base name, weight, italic angle, and embedding state
Software Development Blog
PDFium Component
PDFium Component tutorials for rendering, viewing, and processing PDFs in Delphi
Auditing PDF Security Risks With PDFium in Delphi
Before you trust a PDF, enumerate its risk surface. See how PDFium reads document JavaScript, launch actions and signature permissions for an audit in Delphi
Build a PDF Viewer in Delphi with PDFium Component
Assemble a working PDF viewer in Delphi with PDFium Component: wire TPdf to TPdfView, load and render a document, then add paging, zoom, and fit-mode
Combine Scanned Images into One PDF with PDFium Component in Delphi
A working Delphi recipe for merging a folder of scanned pages into one PDF with PDFium Component: create the document, add a page per image, scale to fit, and
Render PDF Pages to JPEG Images in Delphi with PDFium Component
Rasterise PDF pages to JPEG in Delphi with PDFium Component: convert DPI to pixel size, render each page to a bitmap, then encode with TJPEGImage at chosen
Creating PDFs from Scratch with PDFium Component in Delphi
Build a PDF from nothing in Delphi with PDFium Component: CreateDocument, AddPage, AddText, and CreatePath, plus the coordinate and font embedding rules that
Text Markup Annotations with PDFium QuadPoints in Delphi
Create highlight and underline annotations with PDFium in Delphi: QuadPoints order, why FPDFAnnot_SetAttachmentPoints returns false, and the Append fix
Deploying the PDFium DLL in Delphi: Fixing Load Failures
Diagnose pdfium.dll load failures in Delphi: fix the 32/64-bit ERROR_BAD_EXE_FORMAT 193, spot a stale DLL, and load the PDFium Component safely across threads
Detecting and Extracting XFA Forms in Delphi with PDFium
Detect XFA forms in Delphi and extract the template, datasets and config packets as raw XML with PDFium Component — static packet reading needs no V8 runtime
XFDF Export and Import in Delphi with PDFium Component
Export and import XFDF form data and annotations in Delphi with PDFium Component: ISO 19444-1 round-trip, 18 annotation subtypes, and locale-safe numbers
Extracting Images from PDFs with PDFium Component in Delphi
Extract embedded images from PDF in Delphi with PDFium Component: read BitmapCount, fetch each Bitmap[], handle silent open failure, and save output as JPEG or
Extracting Text from PDF Files with PDFium Component in Delphi
Extract PDF text in Delphi with PDFium Component: raw glyph access via Character[], paragraph structure via ReadablePageContent, plus the Active silent-failure
Hardening a PDFium Component Binding: ABI and Memory Safety
Wrapping a C library in Pascal hides sharp edges. See real defects in a PDFium binding, from cdecl callbacks to FPC Win64 pointer-width truncation, and their
Inspect PDF Signatures and PAdES Levels in Delphi
Read PDF signatures with the PDFium Component in Delphi and Lazarus: inspect SubFilter, ByteRange and CMS, then detect PAdES B-B to B-LTA baseline levels
Long-Term PDF Signatures in Delphi: PAdES B-LT and B-LTA
Add long-term PAdES signatures in Delphi with the PDFium Component: RFC 3161 timestamps, DSS validation stores and DocTimeStamps for B-T, B-LT and B-LTA
Merging Multiple PDF Files into One Document with PDFium Component
Merge PDF files in Delphi with PDFium Component: ImportPages, page range strings, insertion position, silent failure on bad files, and form field behaviour
N-up Imposition and Page Reordering With PDFium
Lay several PDF pages onto one sheet, reorder pages in place, or pull a subset. See PDFium's imposition and page-move APIs in Delphi, plus their handles
Parsing PDF Dictionaries Safely in Delphi: Name Tokens
Why substring key lookups corrupt PDF dictionary parsing in Delphi: whole name token matching per ISO 32000-1 and resource caps against hostile PDFs
Build an Accessible PDF Reader in Delphi with PDFium
Make a Delphi PDF viewer work with screen readers: tagged reading order extraction, word-level TTS highlighting, and honest fallbacks for untagged PDFs
Delphi PDF Annotation Review with PDFium Component
Build a PDF annotation review panel in Delphi: index markup by page, survive appearance-stream vetoes, and recolour or delete annotations without ghosts
Background PDF Rendering in Delphi with Cancellable Futures
Long PDF renders belong off the UI thread. See how a PDFium binding runs work on background threads with cancellable futures in Delphi. Rendering a page in
Cancellable Progressive PDF Rendering in Delphi (PDFium)
A slow page render should not freeze the UI or run to the end. See how PDFium's progressive rendering becomes cancellable via IFSDK_PAUSE in Delphi
PDF Checkbox Flatten Bug: Field Value vs Widget in Delphi
Checkboxes flatten unchecked in PDFium Component when /V is read from the widget annotation, because /V belongs to the parent field dictionary per ISO 32000-1
Delphi vs FPC: 4 Hidden PDF Code Pitfalls in PDFium Builds
Four hidden gaps between Delphi and FPC/Lazarus hit the same PDFium code: record temporary lifetime, range checks, E2010 TBytes casts, and AnsiString byte loss
PDFium Emoji and CJK Characters Break WideChar in Delphi
FPDFText_GetUnicode returns a full 32-bit code point, but WideChar holds 16 bits, so PDFium Component in Delphi can corrupt emoji and rare CJK ideographs
You Cannot Silently Patch an Encrypted PDF in Delphi
The PDFium Component in Delphi refuses to patch an encrypted PDF with plaintext markers or PAdES signatures, per ISO 32000-1 7.5.6 on incremental updates
Exact PDF Version Saves in Delphi: PDFiumPas Conformance
PDFiumPas resolves the active xref revision chain and Adobe Extension Level to save Delphi PDFs at an exact version from 1.3 to 1.7 without breaking conformance
WaitForIdle Deadlock in Delphi PDFium Async Rendering
How WaitForIdle and padSynchronize replies deadlock the Delphi main thread in PDFium Component, plus queue capacity, shutdown order and TPdf ownership limits
FillChar on a Function Result Leaks Strings in Object Pascal
FillChar on a Delphi or FPC function result zeroes a managed record without releasing its strings, leaking memory each time the routine runs in a loop
PDF Form Field Navigation in Delphi (PDFium Component)
Why filled PDF forms look blank in Acrobat and how to fix it: FormFill setup, keyboard field traversal, and GenerateFormAppearances in Delphi viewers
FPC for-Loop Bug: Clicking Cancel Does Not Stop Printing
A three-layer print loop in a Delphi and FPC PDF viewer keeps rendering after Cancel is clicked because Free Pascal locks the for loop bound at entry
PDF Viewer for Lazarus and Free Pascal with PDFium
Port a Delphi PDF viewer to Lazarus and Free Pascal: string encoding traps, runtime form construction, PDFium binary loading, and TTS beyond Windows
Low-Vision PDF Colour Filters in Delphi with PDFium
Add dark mode and low-vision reading modes to a Delphi PDF viewer: post-render inversion, two kinds of greyscale, and overlay colours that stay visible
PDFium Matrix Prepend vs Append in Delphi: Pivot Rotation
How the PDF row-vector convention makes Multiply append and PreMultiply prepend in Delphi, why PreTranslate needs the linear part, and how pivot helpers compose
Why Some PDF Object Streams Decode to Garbage in Delphi
Learn why FlateDecode alone leaves PDF object streams differenced instead of raw, and how PDFiumPas applies PNG and TIFF Predictor reconstruction in Delphi
Build a PDF Intake Review Workbench in Delphi with PDFium Component
Triage incoming PDFs in Delphi with PDFium Component: check Info dictionary and XMP metadata, spot encryption, JavaScript, and XFA, and route risky files early
Building PDF/A-compliant archives in Delphi with PDFium VCL
Build verifiable PDF/A archives in Delphi with PDFium Component, from SaveAsPdfA and XMP insertion to ICC OutputIntent handling, conformance downgrades, and
PDF/A Preflight Checking in Delphi with PDFium VCL
Build a PDF/A preflight checker in Delphi with PDFium Component. It token-scans 29 validation issues, honours part-aware rules, and skips full content parsing
PDF/UA Structure Tree Validation in Delphi with PDFium
Walk the live PDF tag tree with PDFium VCL to catch PDF/UA content errors a byte-level scan misses: Figure Alt, Formula text, and unique Note IDs
PDF/VT Variable-Data Printing in Delphi with the PDFium VCL
Create and validate PDF/VT-1 variable-data print files in Delphi with the PDFium VCL, from DPart trees and PDF/X-4 pairing to ISO 16612-2 pitfalls
Batch PDF Preflight Reports in Delphi with the PDFium Component CLI
Automate PDF/A and PDF/UA preflight in Delphi with PDFium Component: batch loops, exit codes, JSON and HTML reports, and why empty findings are not a pass
PDFium Delphi Viewer: Render Cache and Smooth Zoom Tactics
Keep zoom and scrolling smooth in Delphi PDF viewers with PDFium: correct cache keys, bitmap ownership, progressive rendering, and high-DPI memory budgets
Six PDFium Calls That Forgot the Render Lock in Delphi
PDFiumPas render lock protects rasterisation from concurrent UnloadPage or ReloadPage, but six TPdf and TPdfView calls skipped it until v2.26.0
Secure PDF Preview in Delphi Applications with PDFium Component
Harden a Delphi PDF preview pane with PDFium Component: disable JavaScript at load, intercept link clicks, filter attachments, and read encryption permissions
Measuring PDF Text for Layout and Word Wrap in Delphi
Laying out PDF text needs string widths before you draw. See how a PDFium binding measures text without touching the page, for word wrap in Delphi
Stale Text After Editing: the PDFium FPDF_TEXTPAGE Cache
PDFium keeps a cached FPDF_TEXTPAGE handle in Delphi; after AddText, SetText, or AddPath edits it turns stale unless reloaded before the next text query
PDFium Double Rotation and Fit-Zoom Bugs in Delphi
Fix double-rotated PDF thumbnails in Delphi with PDFium: why the render rotate parameter is additive and how fit-zoom swaps width and height for 90/270 pages
Widget Index vs Annotation Index in PDFium Delphi Forms
How PDFium Component separates form field index from annotation index in Delphi: filter Widget subtypes, map at the native edge, fix headless form focus
Word-by-Word TTS Highlighting in Delphi PDFium Viewers
Sync text-to-speech with on-page word highlights in Delphi using PDFium word boxes: TrackReadingWordAt, render ordering, auto-scroll, and Unicode pitfalls
Why XFA Field Edits Vanish on Save in PDFium for Delphi
PDFium Component writes XFA field edits into an in-memory buffer only, so Delphi apps lose the value on save: AcroForm persists it, XFA does not
Printing PDF Documents with PDFium Component in Delphi
Print PDFs from Delphi with PDFium Component: render pages with RenderPage and rePrinting, send bitmaps to TPrinter via StretchDIBits, fit to paper, handle
Reusable Page Stamps via Form XObjects With PDFium
Draw a watermark or logo once, place it on every page. See how PDFium's Form XObjects make reusable page stamps in Delphi, with a simple lifetime rule
Running AcroForm JavaScript in Delphi with PDFium Component
Run AcroForm JavaScript in Delphi with PDFium Component: why field calculations stay silent, V8 DLL requirements, and host events that veto risky PDF actions
Sign PDFs with PAdES B-B in Delphi Using PDFium
Add a PAdES B-B digital signature to a PDF in Delphi with the PDFium Component: self-built SHA-256, CMS, and a Windows CNG backend for byte-level signing
Splitting PDF Documents with PDFium Component in Delphi
How to split a PDF by page, range, or bookmark with PDFium Component in Delphi: TPdf.ImportPages, CreateDocument, SaveAs result checking, and the Active flag
Streaming Huge PDFs on Demand With PDFium in Delphi
A multi-gigabyte PDF need not load whole. See how a TStream adapter feeds PDFium's on-demand FPDF_FILEACCESS callback and why a 4 GiB limit needs a guard in
Side-by-Side PDF Comparison in Delphi with PDFium Component
Build a side-by-side PDF viewer in Delphi with PDFium Component: two or three independent panels, per-view zoom via TPdfView.Zoom, and synchronized page
Validating Compressed PDFs: Object and XRef Streams
Modern PDFs hide structure in compressed object and xref streams. See how a Delphi validator expands ObjStm and reads xref-stream trailers with PDFium
PDF/X Validation in Delphi with the PDFium Component
Validate print-ready PDF/X files in Delphi: PDFium Component's ValidatePdfX runs ISO 15930 checks for TrimBox, Trapped, OPI, LZW, and font embedding
Why Validators Reject PAdES Signatures: PDFium in Delphi
Why PDF validators reject PAdES signatures: zero ByteRange fields, missing D: date prefix, and lost /Encrypt after incremental updates, with PDFium Component
PDF Attachments in Delphi with PDFium Component: Read, Add, Delete
How PDFium Component handles PDF file attachments in Delphi: AttachmentCount, Attachment, CreateAttachment, DeleteAttachment, path sanitisation, and in-place