Invoice Generator
Create professional invoices and download as PDF. Use Simple mode for a one-click invoice like the classic invoice generators, or switch to Advanced for multi-client management, payment tracking, and reusable templates. Totals and tax calculate automatically, and your data saves locally so you can update and reuse it anytime.
Create professional invoices and download them as clean PDFs with SolveBar's Invoice Generator. Use Simple mode for a one-click invoice — fill in the basics and download, no clutter, no signup. Or switch to Advanced mode for multi-client management, payment tracking, saved templates, and a reusable item catalog. Totals and tax calculate automatically, and your data saves locally so you can update and reuse it anytime.
What a professional invoice must include
A legally sufficient invoice requires: your business name and contact details, client name and contact details, unique invoice number, invoice date, payment due date, itemized list of goods or services, subtotal, applicable tax with rate, and total amount due.
Invoice numbering best practices
Use a consistent numbering system: sequential (INV-001, INV-002) or date-based (INV-2024-001). Never skip or reuse invoice numbers — gaps can raise questions with tax authorities.
Payment terms and cash flow
Net 30 means payment is due 30 days after invoice date. Net 15 or Net 7 are common for freelance work. Always specify the payment method you accept. Late payment fees should be stated upfront in your contract to be enforceable.
Frequently Asked Questions
What's the difference between Simple and Advanced mode?
Simple mode is a single-screen invoice form — fill it in and download the PDF, just like a classic invoice generator. Advanced mode adds a saved invoice list with payment/status tracking, a client address book, a reusable item catalog, invoice templates, and CSV export. Both modes save to the same data, so you can switch anytime without losing anything.
Is this tool free to use without watermarks?
Yes. Generated invoices have no watermarks. No account or subscription required.
Can I send the invoice directly from this tool?
No — download the PDF and send it via your email client.
Can I save and re-use my business details?
Yes. Your business information is saved to localStorage. Return anytime and your details will be pre-filled.