To legally send an invoice online, create a professional invoice that includes your business details, the client's information, an itemized list of services or products, and payment terms. You can then email the invoice as a PDF attachment or use invoicing software like TinyInvoice.app.
A valid invoice typically includes your business name and address, the client's name and address, a unique invoice number, the date of issue, a clear description of each item or service with quantities and unit prices, subtotals and any tax, the total amount due, and your payment terms (e.g. net 30, due on receipt). Including these elements helps you stay compliant and makes it clear what the client owes and when.
Sending invoices as PDFs by email is widely accepted for both domestic and cross-border work. Keeping a copy of each sent invoice and any proof of delivery helps with record-keeping and disputes. If you work with multiple clients or currencies, using a dedicated tool keeps everything in one place and reduces errors.
For a straightforward way to create and send legal, professional invoices online, try TinyInvoice.app: you can build itemized invoices with your business and client details, export them as PDFs, and email them to clients in minutes.