WowInvoice and WP Overnight’s PDF Invoices & Packing Slips are two WooCommerce plugins that automate invoicing and related order documents. Both support PDF invoices, packing slips, email attachments, customization and electronic invoices.
However, they approach document management differently.
WowInvoice combines invoicing, fulfillment, shipping and refund documents within one plugin.Â
WP Overnight focuses on invoicing and packing slips, with Professional and Premium Templates extensions for additional document types, customization and automation.
This comparison examines their features, workflows, electronic invoicing capabilities and licensing to help you decide which fits your WooCommerce store.
Disclosure: We evaluated WowInvoice through direct product use and explored WP Overnight’s free plugin settings and document previews. WP Overnight’s paid features and advanced electronic invoicing capabilities were assessed using official documentation.
WowInvoice vs WP Overnight: Quick Comparison
| Comparison point | WowInvoice | WP Overnight |
|---|---|---|
| Primary focus | Invoicing and order fulfillment document management | Invoicing, packing slips and electronic invoicing |
| Document types | Seven document types within one plugin | Invoices and packing slips in Free; credit notes, proforma invoices and receipts through Professional |
| PDF customization | Premade templates and document configuration | Free HTML/CSS templates; visual customizer with Premium Templates |
| Automated attachments | Configurable document email attachments | Invoice PDF/XML attachments in Free; additional document attachments through Professional |
| Bulk operations | Document generation and bulk exports | Bulk invoice/packing-slip generation in Free; advanced exports through Professional |
| Invoice numbering | Custom numbering formats with suffix and prefix | Sequential numbering with prefix, suffix and padding |
| Electronic invoicing | UBL/XML invoices available in Free for 3 types of formats | Multiple formats, including UBL, Peppol BIS, CII, Factur-X and ZUGFeRD |
| Cloud document storage | No equivalent built-in cloud upload confirmed | Cloud and FTP/SFTP uploads through Professional |
| Product structure | Free and Pro within one plugin | Free plugin plus Professional, Premium Templates and other extensions |
| Licensing | Annual and lifetime options | Paid annual extensions and bundles |
Document Types and Order Management
Document coverage is one of the biggest differences between the two plugins.
What Documents Can You Create with WowInvoice?
WowInvoice supports seven document types for WooCommerce invoicing, fulfillment and refunds:
- PDF Invoices: Generate invoices containing order, payment and tax details.
- Packing Slips: List products and quantities included in each order.
- Delivery Notes: Provide order and delivery details for shipments.
- UBL/XML Invoices: Generate structured, machine-readable electronic invoices.
- Picklists: Help warehouse staff collect products for order fulfillment.
- Shipping Labels: Create labels containing recipient and shipping information.
- Credit Notes: Document refunds and adjustments to previous invoices.
These documents are configured within the WowInvoice plugin, with Free and Pro determining access to particular document types and advanced settings.
For fulfillment-heavy stores, the documents support different stages of the same order: picking products, verifying packed items, preparing shipments, recording delivery and handling refunds.
What Documents Can You Create with WP Overnight?
WP Overnight supports the following core PDF documents through its free plugin and Professional extension:
- PDF Invoices: Generate invoices with customer, order, payment and tax information.
- Packing Slips: List the products and quantities included in an order.
- Credit Notes: Document refunds and invoice adjustments.
- Proforma Invoices: Generate preliminary invoices before issuing final invoices.
- Receipts: Provide payment documentation for completed transactions.
WP Overnight also generates structured electronic invoices in formats such as UBL/XML.
Unlike WowInvoice’s broader document set, dedicated picklists, delivery notes and shipping labels are not listed among the standard document types of WP Overnight’s core, Professional, or Plus products.
Setup, Templates and Document Customization
Both plugins provide invoice templates, business information settings and document previews. Their customization options differ in how they are configured and extended.
WowInvoice Customization
WowInvoice provides premade document templates and a built-in configuration interface.
Merchants can customize elements including:
- Store logo, business identity and contact information.
- Billing and shipping addresses.
- Product details, quantities and table columns.
- Invoice numbering and financial breakdowns.
- Tax information, customer notes and terms.
- Barcodes, QR codes and payment-related information.
WowInvoice also allows users to preview documents using WooCommerce order data and reuse configured business details across supported document types.
WP Overnight Customization
WP Overnight Free includes a document settings interface with a live PDF preview.
During our basic setup review, we found options for:
- Paper size and invoice templates.
- Shop information, logo dimensions and business addresses.
- Invoice numbers, prefixes, suffixes and padding.
- Customer notes, shipping addresses and invoice dates.
- Additional formatting and advanced document settings.
The free plugin includes editable HTML/CSS templates for merchants who need code-level layout changes.
WP Overnight’s Plus Bundle adds Premium Templates, including Modern and Business layouts, with a drag-and-drop PDF customizer.Â
Invoice Automation and Bulk Management
Both plugins automate invoice delivery and reduce the need to process every WooCommerce order manually.
| Workflow | WowInvoice | WP Overnight |
|---|---|---|
| Automatic invoice generation | Supported | Supported |
| WooCommerce email attachments | Supported | Supported |
| Customer invoice downloads | Supported | Supported |
| Order-status-based configuration | Supported | Supported |
| Bulk PDF generation | Supported | Supported |
| Advanced bulk exports | Supported | Professional extension |
| Packing-slip email attachments | Configurable feature | Professional extension |
| Cloud document uploads | Not established as built-in | Professional extension |
How WowInvoice Handles Automation
WowInvoice allows store owners to configure document generation and delivery based on WooCommerce order statuses.
It supports email attachments, customer downloads, custom numbering and bulk document exports.
Its document automation also extends beyond customer invoices.
For example, a store can generate invoices for customers while using picklists, packing slips and shipping labels for fulfillment.Â
Merchants can generate invoices for existing WooCommerce orders, including orders placed before WowInvoice was installed.
How WP Overnight Handles Automation
WP Overnight Free can automatically attach PDF or XML invoices to selected WooCommerce emails.
Its document settings also allow merchants to configure invoice numbering, customer download permissions and order-status behavior. Invoices and packing slips can be generated in bulk from WooCommerce orders.
The Professional extension expands automation with:
- Email attachments for additional document types.
- Bulk exports filtered by date, order status, or customer.
- Custom order notifications for warehouse staff and other recipients.
- Automatic document uploads to supported cloud or server destinations.
- Additional document numbering and filename settings.
WP Overnight also offers separate products for specialized tasks such as automated printing.
Electronic Invoicing and Tax Configuration
Both plugins support structured electronic invoices, but WP Overnight offers a broader documented selection of electronic invoice formats.
WowInvoice Electronic Invoicing
WowInvoice supports UBL/XML invoice generation in its Free version.
It also provides settings for displaying business tax information and customer VAT or tax identification numbers.
VAT details can be retrieved from supported WooCommerce extensions, order metadata, or configured checkout fields.
WP Overnight Electronic Invoicing
WP Overnight Free supports several structured electronic invoice formats:
- UBL 2.1
- Peppol BIS Billing 3.0
- CII D16B
- Factur-X 1.0
- ZUGFeRD 1.0
- ZUGFeRD 2.0
Its E-Documents configuration includes syntax selection, supplier and customer identification fields, tax classification and options for electronic invoice attachments.
During our review, we inspected these settings, including supplier VAT information and tax categories. We did not independently validate generated XML files against country-specific electronic invoicing requirements.
An important distinction: Generating a Peppol-compatible XML invoice does not automatically mean transmitting it through the Peppol network. Network transmission is a separate workflow and may require an additional service.
Similarly, neither plugin’s VAT fields or XML generation alone guarantee compliance with every country’s invoicing regulations.
Merchants should verify the required formats, tax fields, validation procedures and submission requirements for their jurisdiction.
WowInvoice vs WP Overnight Pricing and Licensing
Both plugins offer free functionality, but their paid product structures differ.
Pricing Structure
| Pricing factor | WowInvoice | WP Overnight |
|---|---|---|
| Free plugin | Available | Available |
| Main paid offering | WowInvoice Pro | Professional extension |
| Advanced visual templates | Included template/configuration features | Premium Templates extension or Plus Bundle |
| Additional paid documents | Within WowInvoice Pro | Professional extension |
| Single-site annual license | $69 regular price | Professional from €69/year* |
| Higher-tier annual licensing | $149 regular price for unlimited sites | Multi-site Professional and Plus licenses |
| Lifetime license | $299 for one site; $599 for unlimited sites | No equivalent lifetime plan advertised |
Understanding the Product Costs
👉 WowInvoice: A Pro license provides access to its supported advanced document types and features. Buyers can choose an annual subscription or a lifetime license. The unlimited-site option may be relevant to agencies and merchants managing multiple stores.
👉 WP Overnight: The free plugin covers core invoicing and packing slips. Professional adds credit notes, receipts, proforma invoices, advanced exports and document storage options. The Plus Bundle includes Professional and Premium Templates for additional visual customization.
The purchasing decision therefore involves more than comparing the two entry-level prices.
For a store needing only basic PDF invoices, neither paid product may be necessary.
For a store requiring credit notes, advanced exports and visual customization, compare the cost of the complete feature set needed from each vendor.
For long-term use, WowInvoice’s lifetime option eliminates the need for annual license renewal under its advertised lifetime terms. WP Overnight’s recurring licensing may still make sense when its specific invoicing or document-storage features are required.
Current plans are available on the WowInvoice pricing page and WP Overnight’s Plus Bundle page.
Who Should Choose WowInvoice or WP Overnight?
The better solution depends on whether your store mainly needs invoices or a broader set of operational documents.
| Store requirement | Recommended option | Reason |
|---|---|---|
| Basic PDF invoices and packing slips | Either | Both cover these requirements for free |
| Picklists, shipping labels and delivery notes | WowInvoice | These document types are included in its product family |
| Multiple structured e-invoice formats | WP Overnight | Broader explicitly documented format support |
| Credit notes, receipts and proforma invoices | WP Overnight | Professional supports all three as dedicated documents |
| Invoice, fulfillment and refund documents in one plugin | WowInvoice | Broader document coverage without separate premium extensions |
| Advanced cloud document storage | WP Overnight | Professional supports cloud and server uploads |
| Annual or lifetime licensing | WowInvoice | Both licensing options are available |
| Established WP Overnight invoicing workflow | WP Overnight | Switching may be unnecessary if current requirements are already satisfied |
Choose WowInvoice If…
You need more than PDF invoices and packing slips.
WowInvoice is particularly suitable for merchants who want invoicing, picking, packing, shipping, delivery and refund documents managed within one plugin.
It also offers annual and lifetime licensing, including an unlimited-site option for stores and agencies managing multiple WooCommerce websites.
Choose WP Overnight If…
Your primary requirements involve invoice generation, packing slips and detailed electronic invoicing.
WP Overnight offers substantial functionality in its free plugin, a broad selection of electronic invoice formats and Professional extensions for specialized invoicing workflows.
Its paid products are also relevant when cloud document storage, proforma invoices, receipts, or advanced template editing are priorities.
Final Verdict
Both WowInvoice and WP Overnight can automate WooCommerce invoicing effectively, but their strengths serve different operational requirements.
WowInvoice offers broader document management, covering invoicing, fulfillment, shipping and refunds within one plugin. It is worth considering for stores that need several document types together or prefer lifetime licensing.
WP Overnight offers a more invoicing-focused system, with extensive electronic invoice format support, mature template customization options and specialized extensions for advanced document workflows.
If your store primarily needs invoices and packing slips, either free plugin may be sufficient. If you also need warehouse picking, shipping labels, delivery notes and credit notes, WowInvoice provides those document types together.
Explore WowInvoice’s features and pricing or try WowInvoice Free to evaluate the workflow for your store.
