---
title: Advanced TCPDF Configuration and Barcodes
description: Tune the TCPDF engine behind WooCommerce PDF invoices with advanced options, fonts, and barcodes.
url: "https://wpfactory.com/docs/advanced-tcpdf-configuration/"
updated: "2026-09-27"
category: References
---

# Advanced TCPDF Configuration and Barcodes

[PDF Invoices & Packing Slips Generator for WooCommerce](https://wpfactory.com/item/pdf-invoicing-for-woocommerce/) renders documents with the TCPDF library. The **Advanced Options** in the General section let you tune that engine and even call TCPDF methods directly from your template. This reference explains each option and shows how to add a barcode.

All options below are in **WPFactory > PDF Invoicing** (also reachable at **WooCommerce > Settings > PDF Invoicing**), General section, **Advanced Options**.

### Calling TCPDF methods from HTML

When **Use custom config** and **TCPDF methods in HTML** are both enabled, you can invoke a TCPDF method from the template with the `<tcpdf>` tag. For security, only methods you whitelist in **Allowed TCPDF methods** can be called, each wrapped in pipe characters.

For example, to allow barcode methods, set **Allowed TCPDF methods** to:

```
|write1DBarcode|write2DBarcode|
```

Then in the document **HTML content**, add a QR code for the order number:

```
<tcpdf method="write2DBarcode" params="||QRCODE,H|||30|30" />
```

The `[page_break mode="tcpdf"]` shortcode uses the same mechanism to call `AddPage`.

**Note:** `<tcpdf>` calls run only when both **Use custom config** and **TCPDF methods in HTML** are on, and only for methods listed in **Allowed TCPDF methods**. Leave the whitelist empty if you do not need this, so no methods are exposed.

### Advanced options reference

| Option | Option ID | Default | Purpose |
| --- | --- | --- | --- |
| Suppress errors | `alg_wc_pdf_invoicing_suppress_errors` | Yes | Prevents stray PHP notices from corrupting the PDF stream. |
| Use custom config | `alg_wc_pdf_invoicing_use_custom_tcpdf_config` | Yes | Loads the plugin's TCPDF config file. |
| TCPDF methods in HTML | `alg_wc_pdf_invoicing_use_custom_tcpdf_config_calls_in_html` | Yes | Enables the `<tcpdf>` tag (requires Use custom config). |
| Allowed TCPDF methods | `alg_wc_pdf_invoicing_use_custom_tcpdf_config_allowed_tags` | (empty) | Whitelist of callable TCPDF methods, pipe-wrapped. |
| Set default images directory | `alg_wc_pdf_invoicing_tcpdf_path_images` | Yes | Uses the WordPress uploads folder as the base for image paths. |
| Early TCPDF load | `alg_wc_pdf_invoicing_tcpdf_early_load` | No | Loads TCPDF early to resolve conflicts with other libraries. |
| Use Print.js | `alg_wc_pdf_invoicing_use_print_js` | Yes | Uses Print.js for the Print action instead of a new tab. |
| Use monospace font | `alg_wc_pdf_invoicing_use_monospace_font` | No | Monospace font in the HTML editor fields for easier code editing. |
| Shortcode prefix | `alg_wc_pdf_invoicing_shortcode_prefix` | (empty) | Prefixes all plugin shortcodes to avoid clashes with other plugins. |

### Fonts

Each document offers these fonts: **DejaVu Sans (Unicode)**, **Times New Roman**, **Helvetica**, and **Courier**. If language-specific characters do not display, choose DejaVu Sans (Unicode), which has the widest coverage.

### Need a hand?

For help with a specific TCPDF method or barcode format, contact us on the [PDF Invoicing support forum](https://wpfactory.com/support/item/pdf-invoicing-for-woocommerce/).

Related articles

- [Document-Specific Configuration](https://wpfactory.com/docs/document-specific-configuration/)
- [General Settings Configuration](https://wpfactory.com/docs/general-settings-configuration/)
- [PDF Invoice Shortcode Attributes and Placeholders Reference](https://wpfactory.com/docs/pdf-invoice-shortcode-attributes-reference/)