Most people hunting for a free receipt maker just need to hand a customer proof of payment for work they actually did, and end up retyping a web form for every job. This prompt turns Claude, ChatGPT or Gemini into a receipt writer for your own business: your name on it, your sale, the real date. It writes receipts only for a service you performed or goods you sold yourself. It will not write one in the name of a shop you do not own, will not reproduce anyone else's logo or tax number, and will not backdate one for a return or an expense claim that never happened.
Paste the prompt into a new chat, a Claude Project or a custom GPT, then give it your business details, the line items and how the customer paid. It asks the five things it needs, then returns a clean receipt: numbered series, line item table, subtotal, tax broken out by rate, total paid, payment method with change on cash sales, and a note listing every assumption it made.
The same file works in Claude, ChatGPT and Gemini. Paste it in once, install takes under two minutes, and it is a single payment with nothing to renew.