Process e-invoices without replacing your accounting system.

How it works

• Let them arrive — E-invoices arrive automatically from your own mailbox or by upload. Avi recognizes XRechnung and ZUGFeRD and renders a readable view.
• Validate officially — Every invoice runs through the official XRechnung validation. Errors are explained plainly; nothing is silently corrected.
• Approve — You check recipient, amounts and version. Only after your approval does an invoice move on. Every step is logged.
• Hand off or send — Export with the original and the validation report for your accountant, or send an approved outbound invoice from your own mailbox.

More than an invoicing tool

Simple invoicing tools start around 9 euros a month and let you write invoices inside their own bookkeeping. Avi does the part the law actually cares about: receiving, official validation, documented approval, an unchangeable archive with checksums, and a clean hand-off to your accountant. It runs next to the accounting system you already use, so you switch nothing.

• The official validation, not a homemade check — Every incoming invoice runs through the validation the standard defines, hosted on German servers. You get a result you can show your accountant or an auditor, not a green checkmark we invented.
• An archive that holds up — Originals are stored unchanged, with a SHA-256 checksum and a complete event log, and you export the whole archive as a ZIP in one click. The statutory retention duty (eight years for invoices) is on you as a business; we keep everything for ten, so you meet it.
• Your process, documented — Avi generates the Verfahrensdokumentation for your e-invoice process, the written record the tax authority expects you to have. Cheap tools leave you to write it yourself.
• Any format in, a valid XRechnung out — A photo, a PDF, a Word or Excel file becomes a checked draft you confirm field by field, then a technically valid XRechnung. No retyping.
• It sits beside your bookkeeping — Keep your accounting exactly as it is. Avi is the compliance layer around it, not a system you have to migrate to.
• German servers, EU data storage — Validation runs in Frankfurt and your data stays in the EU, which is what makes the archive defensible.

Pricing

You pay per invoice. S for a one-off test, M to XL for a year of invoicing. Our setup service can be added to any size.

Convert PDF to ZUGFeRD · E-invoices automatically from your ERP · Or read the step-by-step start guide first

Data retention and cancellation

Your originals and e-invoices are stored unchanged, with SHA-256 checksums and a complete event log, in a private archive in the EU, for 10 years (the statutory minimum for invoices is 8). The archive stays available when your plan ends: you can still open and download everything, you just cannot convert new documents. Export your complete archive as a ZIP at any time. We only delete your data if you ask us to, after you have exported it.