Builds a landscape A4 certificate from five templates — achievement, completion, appreciation, participation, award — in English or Indonesian, with the issuing organisation, recipient name, title, an optional description, date, certificate number, up to three signatories (Name | Role), a foil-style seal with the issuer initials, and classic (serif, double border) or modern styling in your brand and accent colours. Print the preview or the downloaded HTML to PDF. Everything runs locally.