UBL is the international XML standard for invoices and business documents, used across Peppol networks in Europe, Australia, Singapore, and beyond. Most validators are technical CLI tools or enterprise integrations with a steep learning curve. GetUBL is the simple alternative: drop in a UBL XML file to validate it with plain-language errors, or generate a compliant invoice from a clean form. No signup, no friction. Just the format, made approachable for anyone working in cross-border B2B.