TCPDF is a pure-PHP library for generating PDF documents and barcodes directly in application code.

It has been widely used across many PHP stacks and still provides a complete feature set for text rendering, page composition, graphics, signatures, forms, and standards-oriented output.

Starting with version 7, the TCPDF class no longer contains its own PDF engine. It is a compatibility facade: every public TCPDF method is a thin wrapper that delegates the actual PDF generation to the modern tecnickcom/tc-lib-pdf engine (\Com\Tecnick\Pdf\Tcpdf), while a small internal state layer reproduces the legacy stateful cursor and page model (current X/Y, margins, fonts, colors, automatic page breaks, headers/footers).

What this means in practice:

• The public API is (mostly) unchanged. All 291 public method signatures (names, parameters, defaults) are identical to legacy TCPDF; existing integrations keep calling new TCPDF(...), AddPage(), SetFont(), Cell(), writeHTML(), Output() exactly as before.
• Rendering is done by the modern engine. Text layout, HTML/CSS, fonts, graphics, barcodes, encryption, signatures and output generation come from the tc-lib-* libraries.
• Per-method delegation status is documented. See MAPPING.md for the status of every public method (delegated, adapter, shim, intentional-noop, blocked) with notes; the table is machine-verified against the class.
• Output is structurally equivalent, not byte-identical. Documents render with the same page sizes and content, but the modern engine's line-breaking and font metrics can differ slightly from the legacy implementation (long flowing documents may paginate one page earlier or later).
• Some legacy behaviors are intentionally not reproduced. A few features are dropped or changed where the modern engine's model takes precedence (legacy font definitions, EPS/AI vector import, always-on stream compression, policy-based local file access, assorted no-ops). See Breaking Changes below and the per-method notes in MAPPING.md for the full list.

TCPDF is deprecated and in maintenance-only mode.

Active feature development has moved to tc-lib-pdf, the modern and modular successor.

For new projects, use tecnickcom/tc-lib-pdf. This repository remains available for legacy systems and critical compatibility fixes.

• New projects: install tecnickcom/tc-lib-pdf.
• Existing TCPDF users: keep TCPDF for current production workloads and migrate in phases.
• Teams seeking modern architecture, Composer-first design, and stronger type-safety should prioritize tc-lib-pdf.

TCPDF has migrated font loading to the tc-lib font stack (see "Breaking Changes" below).

• tecnickcom/tc-lib-pdf is the Composer entrypoint.
• Font assets are provided by tecnickcom/tc-lib-pdf-font and discovered under vendor/tecnickcom/tc-lib-pdf-font/target/fonts/.
• Repository-shipped fonts/ assets are removed; TCPDF now resolves bundled fonts from tc-lib assets.

Who is affected:

• Deployments that relied on local fonts/ files without Composer dependencies.
• Applications with custom K_PATH_FONTS assumptions tied to a repository-relative fonts folder.
• Integrations that use custom or generated font definitions and expect PHP-only descriptor files.

How to migrate custom font usage:

1. Install dependencies with Composer.
2. Ensure tc-lib font assets are available in vendor/tecnickcom/tc-lib-pdf-font/target/fonts/.
3. Keep using SetFont()/AddFont() from TCPDF, but validate that each custom family resolves from tc-lib assets or from your explicit font path.
4. Update deployment packaging so vendor/ font assets are shipped in production.

Font generation procedure (Makefile):

1. Run make deps to install Composer dependencies and initialize tc-lib font assets.
2. Run make fonts to initialize fonts only when missing.
3. Run make fonts-rebuild to force a full font asset rebuild.

Expected generated asset sentinel:

• vendor/tecnickcom/tc-lib-pdf-font/target/fonts/core/helvetica.json

Compatibility notes:

• TCPDF checks configured font paths and tc-lib font assets.
• JSON font descriptors from tc-lib are accepted by the TCPDF AddFont() path.
• Legacy PHP font descriptors (fontname.php + fontname.z) are no longer supported (see "Breaking Changes" below); convert the original TTF/OTF with the tc-lib-pdf-font importer instead.

Example:

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

// Optional: override only if you need a non-default path.
define('K_PATH_FONTS', __DIR__.'/vendor/tecnickcom/tc-lib-pdf-font/target/fonts/');

$pdf->SetFont('helvetica', '', 11);

Safe migration checklist:

1. Require tecnickcom/tc-lib-pdf in Composer and install dependencies.
2. Confirm the font asset directory exists under vendor/tecnickcom/tc-lib-pdf-font/target/fonts/.
3. Run your PDF smoke tests for headers, body text, bold/italic, RTL text, and Unicode text.
4. Verify no runtime path assumptions require repository fonts/ files.
5. Remove legacy K_PATH_FONTS overrides that point to removed directories.
6. Re-run regression output comparisons on representative documents.

• Larger feature set: tc-lib-pdf offers many more features than TCPDF, and it is where new ones are added.
• Modern architecture: modular libraries and cleaner component boundaries improve maintainability.
• Better extensibility: new features are easier to add without patching a monolithic legacy core.
• Stronger tooling fit: modern package structure works better with static analysis, CI, and automated tests.
• Lower long-term risk: reduces technical debt tied to legacy APIs and supports ongoing PHP ecosystem evolution.
• Improved delivery speed: teams can implement and ship new PDF capabilities with less friction.

Migration still requires planning and regression checks to preserve rendering parity for existing documents.

The facade favors the modern engine model over bug-for-bug legacy emulation in the following areas. Each is a deliberate, documented contract change:

1. Font model. Fonts are resolved exclusively through the tc-lib-pdf-font stack: JSON definition files discovered under K_PATH_FONTS (vendor/tecnickcom/tc-lib-pdf-font/target/fonts/, generated by make fonts). The legacy TCPDF font definition format (fontname.php + fontname.z / fontname.ctg.z) is not supported and is not converted at runtime:

   • SetFont()/AddFont() accept families known to the tc-lib font stack (core fonts, DejaVu, FreeFont, CID-0, ...) or definition files in the tc-lib JSON format via the font-file parameter.
   • Legacy-only bundled fonts (e.g. aefurat, aealarabiya) are unavailable; requesting them throws a font exception. Use a tc-lib font with equivalent coverage (e.g. freeserif/dejavusans for Arabic) or import the original TTF/OTF with the tc-lib-pdf-font importer.
   • Font subsetting, kerning and metrics follow the tc-lib implementation.

   See "Migrating Font Assets" above for the step-by-step migration procedure.

2. Stream compression is always on. setCompression(false) is a no-op; the engine always compresses content streams.

3. EPS/AI vector import is dropped. The modern engine has no PostScript interpreter, so ImageEps() ignores EPS/AI input. Convert EPS/AI artwork to SVG (e.g. inkscape file.eps --export-filename=file.svg) and use ImageSVG() instead. As a convenience, ImageEps() dispatches SVG and raster file names to the modern paths.

4. RC4 encryption is legacy-only. setProtection() modes 0/1 still work, but the engine deprecates RC4; AES modes (2/3) are recommended. setProtection() must be called before the first page is added.

5. Resource loading is policy-based. The engine restricts where external resources (images, fonts, SVG, imported PDFs) may be loaded from: local reads are limited to an allowlist of trusted directories and remote (HTTP/HTTPS) reads are disabled by default. The legacy setAllowLocalFiles() toggle no longer widens access; the policy is driven by configuration constants instead (see Resource Loading Security).

Smaller deliberate no-ops (disk caching, setDocInfoUnicode(), header XObject template caching, vector-image rasterization toggles, ...) are listed with their reasons in MAPPING.md.

External resources are fetched through the sandboxed file helper provided by tc-lib-pdf / tc-lib-file. The sandbox enforces two independent allowlists, both configurable via define() constants (read by tcpdf_autoconfig.php, overridable in config/tcpdf_config.php or before the autoconfig runs):

Local reads. The built-in allowlist always covers the system temp directory, K_PATH_MAIN, the bundled vendor/tecnickcom/ directory, the current working directory, K_PATH_FONTS, K_PATH_IMAGES and the running script's directory. K_ALLOWED_PATHS only ever widens this set — paths are resolved with realpath(), so non-existent or unresolvable entries are silently ignored and traversal/symlink tricks collapse to their canonical prefix. There is no way to read below the built-in roots.

Remote reads. Remote URL loading is off by default — the single most important defense against SSRF when rendering untrusted HTML/markup. To opt in, list the exact host names you trust in K_ALLOWED_HOSTS. TLS certificate verification and redirect handling are enforced upstream and cannot be relaxed through K_CURLOPTS.

// Enable downloads from two trusted CDNs, cap them at 10 MiB, and add a custom timeout.
define('K_ALLOWED_HOSTS', ['cdn.example.com', 'assets.example.org']);
define('K_MAX_REMOTE_SIZE', 10 * 1024 * 1024);
define('K_CURLOPTS', [CURLOPT_TIMEOUT => 15]);
// Allow reading shared assets from outside the install tree.
define('K_ALLOWED_PATHS', ['/var/www/shared/assets/']);

Document encryption is a separate concern: setProtection() (item 4 above) controls the PDF permission flags and password/public-key encryption and is unaffected by these resource-loading constants.

• PHP 8.2 or later
• ext-curl

Optional extensions for richer output in some workflows: gd (automatic raster format conversion), zlib.

This repository ships a real validation harness:

The example smoke runner (scripts/example_smoke.php) requires pdfinfo (poppler-utils) and treats any warning, notice, or deprecation as a failure. Examples that exercise a declared breaking change can be tracked as expected failures with a documented reason (currently none: all 68 examples pass).

Third-party bundled font assets are provided through tecnickcom/tc-lib-pdf-font under vendor/tecnickcom/tc-lib-pdf-font/target/fonts/.

TCPDF no longer ships a repository-local fonts/ directory.

For full details, see the bundled notices shipped by tecnickcom/tc-lib-pdf-font.