README

The next generation of TCPDF - a modern, modular PHP library for programmatically generating PDF documents.

💖 Keep TCPDF maintained. tc-lib-pdf is the actively-developed successor to TCPDF, which is installed 100M+ times across 500+ PHP packages and is now maintenance-only. If your company depends on it, become a sponsor to keep this shared infrastructure secure and maintained. See Sponsors for tiers.

Overview
Sponsors
For TCPDF Users
Features
Requirements
Installation
Quick Start
Examples
In-Depth Documentation
Contributing

Overview

tc-lib-pdf is a pure-PHP library for generating PDF documents.
It is the modern evolution of TCPDF, built around a modular package architecture, a Composer-first workflow, and strict PHP types.

It coordinates companion packages for fonts, images, graphics, pages, filtering, encryption, and digital signatures into a single document-authoring API.

Why tc-lib-pdf:

Pure PHP. No external binaries, headless browsers, or shell calls in the rendering pipeline. Only gd and zlib are optional extensions.
Archival, print, and accessibility conformance in one library. PDF/A (1/2/3, a/b/u), PDF/X (1a, 3, 4, 5), and PDF/UA (1, 2) are built in, under the LGPL.
Signing up to PAdES B-LTA. Detached CMS and PAdES B-B/B-T/B-LT/B-LTA, with RFC 3161 timestamps, embedded revocation evidence, and support for both local keys and remote HSM signing.
Reproducible output. Pinning the dates and file identifier renders byte-identical documents on every run, so builds are diffable and verifiable.
Modular and strictly typed. Each concern is a separate Composer package with declared types, so upgrades and dependencies stay scoped.
Continuity with TCPDF. The actively-developed successor to a library installed 100M+ times, by the original author.


Namespace	`\Com\Tecnick\Pdf`
Author	Nicola Asuni <info@tecnick.com>
License	GNU LGPL v3 - see LICENSE
Website	https://tcpdf.org
API docs	https://tcpdf.org/docs/srcdoc/tc-lib-pdf
Packagist	https://packagist.org/packages/tecnickcom/tc-lib-pdf

Releases follow Semantic Versioning:

PATCH: backwards-compatible bug fixes
MINOR: backwards-compatible new features
MAJOR: breaking changes

For TCPDF Users

tc-lib-pdf is not a drop-in replacement for TCPDF:

The codebase is split across separate Composer packages instead of a single distribution.
The API is strongly typed and organized around companion services such as fonts, pages, graphics, and images.
Setup is Composer-first: asset preparation such as font generation is part of project bootstrap, not a bundled step.

The runnable examples in examples/index.md cover the equivalent of most TCPDF workflows.

Features

Text & Fonts

Full UTF-8 Unicode and right-to-left (RTL) language support
TrueTypeUnicode, OpenTypeUnicode v1, TrueType, OpenType v1, Type1, and CID-0 fonts
Supplementary-plane characters above U+FFFF, including mathematical alphanumeric symbols and emoji (doc/FONTS.md)
Font subsetting to keep file sizes small
Text hyphenation, stretching, and letter-spacing (tracking)
Language-aware TeX hyphenation patterns and optional zero-width breakpoints
Text rendering modes: fill, stroke, and clipping
Automatic line breaks, page breaks, and justification

Layout & Content

All standard page sizes, custom formats, custom margins, and configurable units of measure
HTML and CSS rendering
SVG rendering
Multi-column layouts and no-write page regions
Headers, footers, and common page content
Bookmarks, named destinations, and table of contents
Automatic page numbering and page groups
Full page box control (Media/Crop/Bleed/Trim/Art), page reordering, and viewer preferences
Per-page transparency group control via setPageTransparencyGroup(): 'auto' (default) emits the page transparency /Group only on pages that use transparency, 'always' emits it on every page, 'never' omits it

Images & Graphics

Native JPEG, PNG, and SVG support
Extended image format handling via GD (GD, GD2, GD2PART, GIF, JPEG, PNG, BMP, XBM, XPM, WBMP, TIFF, ICO, PSD, IFF, SWC)
Geometric graphics and 2D transformations
Linear and radial gradients, Coons patch mesh gradients, crop marks, and registration bars
JPEG and PNG ICC profiles, grayscale/RGB/CMYK/spot colors, transparencies, and overprint control

Security & Standards

Password and certificate-based document encryption (RC4 and AES, up to 256-bit)
Remote resource controls via fileOptions with host allowlists plus separate internal and markup local-path allowlists for external assets
Digital signatures: detached CMS (PKCS#7) and PAdES baseline signatures (ETSI EN 319 142-1) through the signature() facade, with configurable appearance fields. Profiles: legacy (ISO 32000-1 adbe.pkcs7.detached), pades-b-b, pades-b-t, pades-b-lt, pades-b-lta (ETSI.CAdES.detached), with RSA or ECDSA keys and sha256/sha384/sha512 digests. Local (private-key) and external/remote (HSM) signing are both supported. The cryptography lives in tc-lib-pdf-sign; see doc/DIGITAL_SIGNATURES.md
RFC 3161 TSA timestamps (PAdES B-T): a timestamp token is embedded in the CMS as the id-aa-signatureTimeStampToken attribute, with configurable digest algorithm, policy OID, nonce, timeout, and TLS peer verification. The token is verified and matched against the request before it is embedded
LTV (Long-Term Validation) (PAdES B-LT): revocation evidence in a post-signing incremental revision:
- collects the signing certificate chain and fetches OCSP responses and CRL payloads from AIA and CDP URLs
- verifies every response before embedding it, including the certificates carried by the signature timestamp token
- deduplicates binary payloads by fingerprint
- emits a Document Security Store (/DSS) carrying /VRI, /Certs, /OCSPs, and /CRLs, referenced from the re-emitted document catalog
- OCSP, CRL, cert embedding, DSS, and VRI are each enabled independently through the signature() LTV options
Archive timestamps (PAdES B-LTA): signature()->upgradeToLta() adds a /Type /DocTimeStamp archive timestamp over the whole document in a further incremental revision
PDF annotations: links, text notes, file attachments, markup, shapes, media, and widgets
JavaScript embedding
PDF/A (1/2/3, including a/b/u conformance levels): see doc/STANDARDS.md and E001_invoice.php for a Factur-X / ZUGFeRD example
PDF/X (generic alias, PDF/X-1a, PDF/X-3, PDF/X-4, PDF/X-5): print-exchange conformance covering per-variant OutputIntent identifiers, GTS_PDFXVersion in Info dict and XMP, PDF version enforcement, CMYK color forcing for restrictive profiles (X-1a, X-3), transparency restrictions, and suppression of encryption and JavaScript
PDF/UA (generic alias, PDF/UA-1, PDF/UA-2): accessibility conformance covering tagged structure tree (StructTreeRoot / ParentTree), MarkInfo /Marked true, document language (/Lang), DisplayDocTitle true, ActualText for ligatures and special glyphs, figure alt-text tagging, and heading-level clamping to prevent skipped levels; PDF/UA-2 targets PDF 2.0

PDF Import

Import pages from existing PDFs as Form XObjects and place them on any destination page
Import a single page at a user-defined position and scale (importPage / useImportedPage)
Append full documents page-by-page, auto-sized to the source page dimensions (addPageFromImport)
Load source PDFs from a file path or raw byte string (setImportSourceFile / setImportSourceData)
Configurable parser limits with either a warning or an exception when a source cannot be fully resolved (max_resolution_depth, max_nesting_depth, strict_limits)

Other

1D and 2D barcodes via tc-lib-barcode
Interactive AcroForm fields (buttons, checkboxes, radio buttons, text, combo boxes, list boxes)
XObject templates and layers with object visibility controls
Multiple output targets: inline display, forced download, file save, and MIME attachment
Factur-X / ZUGFeRD / Order-X workflows via embedded XML in PDF/A-3 documents (setFacturX())
Reproducible output: pin the dates and the file identifier (setDocCreationDate(), setDocModificationDate(), setFileId()) to render the same bytes on every run
Stream compression via the zlib PHP extension, available in every conformance mode

Requirements

PHP 8.2 or later
Composer

Optional PHP extensions: gd, zlib.

Feature-specific prerequisites:

Digital signatures, timestamps, and LTV require signing certificates and keys, plus any TSA or revocation endpoint the configuration references.
make preflight runs external validation tools when they are installed.

Installation

Install the package with Composer.
Generate companion font files (see doc/FONTS.md).
Run the minimal script using the generated K_PATH_FONTS path.

composer require tecnickcom/tc-lib-pdf

Or add to your composer.json:

{
    "require": {
        "tecnickcom/tc-lib-pdf": "^8"
    }
}

Quick Start

This example assumes the script lives in the project root; adjust the autoload.php and K_PATH_FONTS paths otherwise.

<?php

require(__DIR__ . '/vendor/autoload.php');

\define('K_PATH_FONTS', \realpath(__DIR__ . '/vendor/tecnickcom/tc-lib-pdf-font/target/fonts'));

$pdf = new \Com\Tecnick\Pdf\Tcpdf();

$bfont = $pdf->font->insert($pdf->pon, 'helvetica', '', 12);

$page = $pdf->addPage();

$pdf->page->addContent($bfont['out']);

$html = '<h1>Hello, PDF!</h1><p>Generated with tc-lib-pdf.</p>';

$pdf->addHTMLCell(
    html:   $html,
    posx:   15,   // mm from left page edge
    posy:   20,   // mm from top page edge
    width:  180,  // mm wide (0 = to right margin)
);

$rawpdf = $pdf->getOutPDFString();

$pdf->renderPDF($rawpdf);

getOutPDFString() returns the raw PDF bytes. renderPDF() streams those bytes to the browser; to store them in a file or send them as an attachment, keep the returned string.

Note: realpath() returns false when the fonts directory does not exist. A K_PATH_FONTS error on first run means the fonts have not been generated (see doc/FONTS.md).

Examples

The examples directory holds runnable scripts for the supported features.

Starting points:

examples/index.md: index of available examples.
examples/E000_overview.php: broad feature overview.
examples/E006_minimal.php: minimal PDF generation flow.
examples/E043_html_tables.php: HTML table rendering.
examples/E027_annotations.php: annotation subtypes.
examples/E065_import_single_page.php: PDF page import.

Topic groups:

Document basics (layout, headers/footers, cells, colors, images, text rendering)
Standards and compliance (PDF/X, PDF/UA, PDF/A workflows)
Security and signing (encryption, PAdES/PKCS#7 signatures, timestamps, LTV)
Advanced composition (annotations, templates, layers, page import/reorder)

To run them locally:

make fonts   # generate the companion fonts used by the examples
make server  # start a local PHP server

Then open http://localhost:8971/E000_overview.php.

In-Depth Documentation

Focused guides in the doc/ directory:

Font setup, custom fonts, and third-party font licenses: doc/FONTS.md
ICC profile details: doc/ICC_PROFILE.md
PDF import API, examples, and fidelity notes: doc/PDF_IMPORT.md
Remote resources and fileOptions (allowedHosts, allowedPaths, markupAllowedPaths, cURL policy): doc/REMOTE_RESOURCES.md
External cache for font subsets and images (CacheInterface, selective caching): doc/CACHE.md
Digital signatures, TSA timestamps, and LTV: doc/DIGITAL_SIGNATURES.md
PDF/A, PDF/X, and PDF/UA conformance modes: doc/STANDARDS.md
Development, QA, preflight, and packaging workflows: doc/DEVELOPMENT.md

Contributing

Contributions are welcome. Please read CONTRIBUTING.md and CODE_OF_CONDUCT.md before submitting a pull request.

Fork the repository and create a feature branch.
Write or update tests for your change.
Run make qa to ensure the full pipeline passes.
Open a pull request with a clear description of the change.

Security vulnerabilities should be reported according to SECURITY.md.

tecnickcom / tc-lib-pdf

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