SP E-Invoice Viewer lets you read and visualize electronic invoices directly on your WordPress site. Simply drag and drop a ZUGFeRD/Factur-X PDF or an XML invoice in CII or UBL/XRechnung format – the plugin processes it instantly and displays a clean, structured view inline, without ever saving the file. The output is fully theme-independent, embeddable on any page, and designed for developers, accountants, and invoice reviewers alike.

Feature List

• Drag & Drop Upload** – drop your file directly onto the page, no form clicks required
• ZUGFeRD / Factur-X** – embedded XML is automatically extracted from the PDF
• CII & UBL / XRechnung** – all major e-invoice formats are supported out of the box
• Zero file storage** – files are processed in memory only and discarded immediately after rendering
• EN 16931 Business Terms** – every field can be toggled to show its BT number, perfect for standard compliance checks
• Complete field display** – all invoice fields are always shown, empty ones rendered as “—”, following the Quba Viewer convention
• Theme-independent rendering** – Shadow DOM with full CSS reset ensures identical output in every WordPress theme
• Security by design** – XXE protection, MIME validation, nonce verification, and per-user/IP rate limiting built in
• Flexible rate limiting** – configurable daily upload limit, tracked separately for logged-in users and anonymous visitors
• Shortcode integration** – embed anywhere with `{einvoice_viewer}`, BT display controllable via shortcode attribute
• Localization ready** – full German translation included (114 entries), easily extendable to other languages