Create hundreds of invoices or mail merge letters in seconds.

1. Create a template

• Create your invoice or letter normally in Word.
• Use placeholders wherever content should change later.

Dear {{name}}, thank you for your order at {{firma}}. The invoice amount is {{betrag|fmt_dec}} EUR.

2. Fill the Excel file

Each Excel column uses the same name as the corresponding placeholder.

3. Upload and generate automatically

• Upload your template and your Excel file.
• The Convexio document generator automatically creates all documents, which you can download as a ZIP file.

Placeholders

• Column names are normalized: spaces and special characters become underscores, percent signs become pct, uppercase letters become lowercase.
• Example: RechnungsNr. becomes rechnungsnr_, Rabatt % becomes rabatt_pct, 1,3 GG becomes n1_3_gg.
• Use placeholders like {{name}}, {{firma}}, or {{rechnungsnr_}} in DOCX and XLSX templates.
• Empty or unknown placeholders will not be filled usefully. Check the column list after upload.

Filters

• {{datum|fmt_date}} formats dates as 05/09/2026-style German dates.
• {{leistungszeitraum|fmt_month}} formats dates as May 2026-style German month names.
• {{betrag|fmt_dec}} formats numbers with German separators, for example 1.490,50.
• {{iban|fmt_iban}} groups IBANs in blocks of four.

Filenames

• The filename pattern may use simple placeholders such as {{firma}} or {{name}}.
• If the template filename already contains placeholders, it is used as the default pattern.
• Invalid filename characters such as / or : are replaced during export.

Excel templates

• For XLSX templates, row 1 is the output header row.
• Row 2 is the template row. Each cell may contain placeholders and filters.
• The generated XLSX file then contains one row per data record.

PDF export

• PDF export is optional and uses a locally vendored LibreOffice WASM runtime.
• The first activation loads large local WASM files. No files are sent to a server.
• Safari does not currently support this export reliably.