Barcodes in PDF With Delphi: QR, PDF417, DataMatrix
Vector barcodes print crisply at any size. See how PDFlibPas draws QR, PDF417, DataMatrix, and Code128 symbols in Delphi with error correction and sizing
Software Development Blog
Delphi PDF Library
Delphi PDF Library: PDFlibPas programming guides and examples.
Emailing PDFs via CDO in Delphi: Apartment-Threading Gotchas
PDFlibPas emails PDFs from Delphi through Windows CDO, and correct CoInitializeEx apartment handling is what keeps multi-threaded batch sends from failing
Building a Compliance and Signing Workbench in Delphi with PDFlibPas
Wire PDF/A preflight, PAdES signing, and ByteRange audits into one Delphi workbench with PDFlibPas so the revision you validate is the revision you sign.
PDFlibPas Content-Stream State: CTM and Clip Tracking
Replay a PDF content stream in Delphi with PDFlibPas: track the CTM, text matrix, clip bounds, and the q/Q graphics-state stack for every operator
Export TDataSet and Reports to PDF in Delphi
Export any TDataSet, FastReport, QuickReport or ReportBuilder report to PDF in Delphi using losLab PDF Library, with paginated tables and headless output
PDFlibPas DLL, ActiveX, and dylib Bindings: Calling One PDF Engine from Any Language
How PDFlibPas exposes one flat PDF API as a Stdcall DLL, Safecall ActiveX object, and Cdecl dylib, and the string and handle traps each binding hides.
PDF Lifecycle Actions: Catalog /AA vs Page /AA in Delphi
PDFlibPas attaches document actions such as WillClose and WillPrint to the Catalog /AA, and page actions to the Page /AA in Delphi, with PDF/A limits
Validating E-Invoices: veraPDF and Mustang in Delphi
PDF/A compliance is not invoice compliance. See how PDFlibPas e-invoices pass both veraPDF container checks and Mustang business rules in Delphi.
Embed Missing Fonts in Existing PDFs for PDF/A in Delphi
Fix PDF/A preflight error 00030 in Delphi: EmbedMissingFonts in losLab PDF Library appends font programs to existing PDFs without rebuilding font dictionaries
Retrying Encrypted PDF Passwords in Delphi with PDFlibPas
PDFlibPas retries a wrong PDF password in Delphi by recreating TPDFDocument on every attempt, not by resetting it in place, and stops after sixteen tries
Auditing PDF Encryption and Permissions in Delphi with PDFlibPas
Read the PDF /Encrypt dictionary like an auditor: PDFlibPas calls for algorithm, key length, AES-256 R5 vs R6, permission bits, and Identity filter traps.
Factur-X and ZUGFeRD Hybrid Invoices in Delphi
An e-invoice is a PDF/A-3 with invoice XML embedded inside. See how PDFlibPas builds Factur-X and ZUGFeRD hybrid invoices across profiles in Delphi.
Fast PDF Merge in Delphi: Byte-Level Ref Shifting
How PDFlibPas merges PDFs fast in Delphi by reusing source bytes and shifting indirect references object-by-object, skipping the parse-reserialize round trip.
FDF, XFDF and XFA Form Data Interchange in Delphi
Move PDF form data between AcroForm and business systems in Delphi with losLab PDF Library: FDF and XFDF values, hierarchical fields, rich text and XFA XDP
Form XObject Recursion: PDFlibPas Cycle Detection in Delphi
PDFlibPas EnumPageContentStatesEx recurses into Delphi PDF Form XObjects, detecting cycles by call chain and scoping duplicate resource names correctly
GeoPDF in Delphi: Geospatial Coordinates With PDFlibPas
PDF can carry a map's coordinate system. See how PDFlibPas reads GeoPDF viewports, measure dictionaries, and WKT or EPSG geographic frames in Delphi.
GoToR, GoToE, and Launch Actions in Delphi PDFs
Build PDFlibPas GoToR, GoToE, and Launch actions in Delphi: remote page jumps, embedded PDF targets, and external launches, plus the zero-based page trap
PDF Incremental Updates in Delphi: AppendToStream Guide
Write ISO 32000-1 incremental updates in Delphi with losLab PDF Library's AppendToStream: preserve digital signatures and skip full rewrites of large PDFs
OnExit Reentrancy in a Delphi In-Place Form Editor
PDFlibPas TPDFlibViewer commits in-place form field edits through OnExit; nil FInplaceEditor first or focus loss reenters the commit and corrupts data
Interactive PDF Forms in Delphi: Actions and JavaScript
PDF form actions turn a static page into an app. See how PDFlibPas wires Hide, ImportData, Named and JavaScript actions to fields and links in Delphi.
Build an Interactive PDF Viewer in Delphi with TPDFlibViewer
Build an interactive PDF viewer in Delphi VCL with TPDFlibViewer: five mouse tools, ready-made actions, search hit highlighting, annotation clicks and printing
Merging and Splitting Gigabyte PDFs in Delphi with PDFlibPas Direct Access
Open gigabyte PDFs in milliseconds with PDFlibPas direct access: page handles, streaming merge lists, range extraction, and xref repair for damaged files.
PDF Garbage Collection in Delphi: Mark and Sweep
Why deleting PDF pages does not shrink the file, and how mark-sweep garbage collection in Delphi drops orphaned objects using the trailer root set
Render PDF Pages to 1-Bit Monochrome in Delphi
Render PDF pages to 1-bit monochrome bitmaps and clip a sub-region in Delphi with PDFlibPas, using GDI halftone down-conversion without touching the renderer.
Multi-Engine PDF Rendering in Delphi: Built-in, Cairo, and PDFium with PDFlibPas
Switch between built-in, Cairo, and PDFium renderers per file in PDFlibPas: runtime engine probes, DPI scaling traps, and a fallback chain that logs itself.
PDF Object Streams and Cross-Reference Streams in Delphi
How losLab PDF Library writes PDF 1.5 object streams and xref streams from Delphi: ObjStm layout, type-2 entries, W field widths and encryption rules
PDF Layers in Delphi: Optional Content Groups (OCG)
PDF layers drive maps, CAD drawings and multilingual variants. See how PDFlibPas creates and reads Optional Content Groups and their configs in Delphi.
Read PDF Bookmark and Annotation Actions in Delphi
Most Delphi PDF libraries write bookmark and annotation actions but cannot read them back. Introspect GoTo, URI, Launch and JavaScript actions with PDFlibPas.
PAdES Digital Signatures in Delphi: Signing and Validation with PDFlibPas
Produce PAdES-B-B, B-T, and B-LT signatures in Delphi with PDFlibPas: timestamp reservations, DSS assembly, and ByteRange audits before trusting signed files.
Page Stitching and Watermark Templates in Delphi PDFs
Stitch PDF pages side by side or overlay them with vector fidelity using losLab PDF Library Form XObject capture and composable watermark templates in Delphi
Parallel PDF Page Rendering in Delphi: Thread Safety
Render PDF pages in parallel from Delphi with losLab PDF Library: why TPDFlib needs one instance per worker thread, CoInitialize for GDI+, and safe logging
Reduce PDF File Size in Delphi: Fonts, Images, LZW
Cut PDF file size in Delphi with losLab PDF Library: subset embedded fonts, downsample oversized images, and convert legacy LZW streams to Flate in one pass
PDF/A and PDF/UA Preflight in Delphi with PDFlibPas
Run built-in PDF/A and PDF/UA preflight from Delphi with PDFlibPas: structured findings, diffable reports, save-time fixups, and veraPDF cross-checks.
PDF/A-3 Extension Schemas for Factur-X XMP in Delphi
A Factur-X invoice fails veraPDF if its XMP properties are undeclared. See how PDFlibPas adds the PDF/A-3 extension schema for fx metadata in Delphi.
PDFlibPas Print Preview and Device-Context Output in Delphi
Delphi print preview that matches the printed page: device-context rendering, virtual printers, scaling, and DevMode persistence with PDFlibPas.
PDFlibPas Performance Profiling: Hash Indexes in Delphi
Profile PDFlibPas Delphi PDF rendering: swap linear dictionary scans for hash indexes, per-pixel gamma math for a LUT, and O(n²) string joins for builders
Rebuild Damaged PDF Xref Tables: Delphi Recovery Scan
How the PDFlibPas Delphi PDF Library rebuilds a damaged xref table with a single pass token scanner that ignores strings, comments and stream bytes
Replace PDF Pages in Delphi Without Breaking Bookmarks
Replace PDF pages in place with PDFlibPas so bookmarks, links and form widgets survive by keeping the target page object and moving only the visual keys
Self-Signed Test Certificates in Delphi with CryptoAPI
Generate self-signed RSA test certificates in Delphi with PDFlibPas and Win32 CryptoAPI, covering CryptGenKey key-length flags and CRYPT_EXPORTABLE pitfalls
Building Tagged PDF Structure Trees in Delphi with PDFlibPas
Generate tagged PDFs from Delphi with PDFlibPas: structure trees while drawing, table header semantics, artifacts, and PDF/UA diagnostics before saving.
Text, Image, and Font Extraction from PDF in Delphi with PDFlibPas
Extract positioned text, original image streams, and font metadata from PDFs in Delphi with PDFlibPas, plus extraction options that fit search and audit jobs.
Delphi PDF Text Search with Hit Coordinates: PDFlibPas
Search PDF text by page range in Delphi with PDFlibPas: each hit returns its page and bounding rectangle, plus enumerate every text block and image on a page.
True PDF Redaction in Delphi: Delete and Sanitize
Real PDF redaction in Delphi with losLab PDF Library: RedactRegion deletes content-stream bytes while SanitizeDocument strips metadata, scripts, and actions
Hardening a Pascal PDF Parser Against Malicious Files
A PDF parser is an attack surface. Review integer overflow, out-of-bounds writes, and unbounded recursion in font and image decoders, plus the Delphi fixes
Vector Graphics in PDF With Delphi: Paths and Gradients
A PDF is a full 2D vector canvas. See how PDFlibPas draws paths, Bezier curves and axial gradients, with even-odd versus nonzero fill, in Delphi.
PDF Viewer Disk Cache and Per-Monitor DPI in Delphi
Speed up a Delphi PDF viewer with a cross-session disk page cache and per-monitor DPI: FNV-1a fingerprints, LRU pruning and WM_DPICHANGED in losLab PDF Library
XFA SOM Path Expressions in Delphi: Dynamic Form Data
Fill repeating rows in dynamic XFA forms from Delphi using XFA 3.3 SOM path expressions in losLab PDF Library: $record roots, [*] occurrences and predicates