What is Online Invoice Generator?
Online Invoice Generator is a free web tool that helps you quickly create professional business invoices. No software installation needed, just open your browser to use. You can customize company information, customer information, add multiple product or service items, set tax rates, add notes. The tool automatically calculates subtotal, tax and total amount. Generated invoices are downloaded as text files, can be sent directly to customers or printed. All data is processed locally in the browser, never uploaded to servers, ensuring your business data privacy and security. Use cases: freelancers issuing service invoices, small businesses invoicing product sales, self-employed individuals daily invoicing, temporary business transactions, etc.
Use Cases
- ◆Freelancers — Issue professional invoices for design, development, consulting services
- ◆Small Businesses — Invoice customers after selling products or providing services
- ◆Self-employed Individuals — Invoicing needs for daily business operations
- ◆Temporary Transactions — Quick invoicing for one-time business transactions
- ◆Remote Work — Issue international invoices for remote or overseas clients
Features
- ✓Custom Company Information
- ✓Custom Customer Information
- ✓Multiple Items Support
- ✓Automatic Tax Calculation
- ✓Invoice Number Management
- ✓Due Date Setting
- ✓Notes Addition
- ✓100% Browser-based Processing
FAQ
Is this invoice generator free?
Completely free, no hidden fees. You can use this tool to create invoices unlimited times, no registration required, no payment needed. All features are free, including multiple items, tax calculation, custom information. We promise to keep it free forever.
What format are the generated invoices?
Generated invoices are downloaded as plain text files (.txt format). This format is highly compatible, can be opened and edited on any device. You can send text files directly via email, or copy content to Word, Excel and other software for further formatting. If you need PDF format, you can use the system "Print" function to convert text files to PDF.
How many items can I add?
Theoretically no limit, you can add any number of product or service items. Practical limits depend on browser performance and memory. Recommend no more than 50 items per invoice for best experience. Each item can customize description, quantity and unit price, the tool automatically calculates subtotal and total amount for each item.
Is my data safe?
Completely safe. All data processing happens locally in your browser using JavaScript technology. Your company information, customer information, invoice data are never uploaded to any servers, no data leak risk. After closing the page, all input data is automatically cleared. Suitable for processing sensitive business data and customer information. Our tool does not collect, store or transmit any of your data.
Can I customize invoice numbers?
Yes, fully customizable invoice numbers. Default number is INV-001, but you can change to any format, for example: 2026-001, CLIENT-2026-001, PROJECT-A-001, etc. Recommend using systematic numbering rules for easier management and search later. For example, number by year, customer, project, etc. The tool does not automatically increment numbers, need to manually enter each time, this is more flexible.
Pro Tips
💡 Recommend adding payment method and payment terms in notes, for example: "Please pay within 30 days of receiving invoice, bank transfer, Alipay, WeChat Pay supported". Save common customer information templates, quickly copy and paste when invoicing next time. Use systematic invoice numbering rules, convenient for financial management and tax filing. Regularly backup generated invoice files.