What is an invoice generator?
An invoice generator (sometimes called an invoice maker) is an online tool that turns your billing details into a finished, professional invoice. Instead of wrestling with spreadsheets or word processor templates, you type in who you are, who you are billing and what you are charging for, and the tool handles the arithmetic, the formatting and the layout.
A good invoice does three jobs at once: it tells your customer exactly how much to pay and by when, it gives you a tidy record for bookkeeping and tax filing, and it makes your business look established and trustworthy. This free online invoice generator is built for all three, with live totals that update as you type and a print-ready document that looks right whether your client is across the street or across the world.
How to create an invoice
- Add your business details. Enter your business name, contact details, address and country. Add a tax or registration ID and your logo if you have one.
- Add your customer's details. Enter who you are billing, with their address, country and tax ID if applicable.
- Set invoice details and currency. Add an invoice number, invoice date, due date and payment terms, and choose from 35 currencies.
- Add line items. Add one line per product or service with quantity, unit price and an optional discount. Reorder or remove items any time.
- Configure tax and discounts. Enable VAT, GST, sales tax or a custom tax, choose tax-inclusive or exclusive pricing, and add an invoice-level discount.
- Preview, download or print. Pick a Classic, Modern or Minimal template, check the live preview, then download a PDF or print the invoice, no account needed.
Every invoice you create gets its own number. When you press New invoice, the generator automatically increments your previous invoice number, so your records stay sequential without any manual bookkeeping.
Haven't agreed a price yet? Send a quote first, then convert it here once your client accepts. See quote vs invoice for when each document applies.
For the full list of fields a professional invoice should include and why each one matters, see our guide on what to include on an invoice.
How invoice totals are calculated
All calculations are deterministic and run entirely in your browser. Each line item is computed as quantity × unit price, minus any line discount. Those line amounts add up to the subtotal. An optional invoice-level discount (either a percentage or a fixed amount) is then subtracted, and tax is applied to the discounted amount to produce the grand total.
For example, two consulting sessions at $150 each give a line total of $300. A 10% invoice discount reduces the taxable amount to $270, and 20% VAT on top brings the grand total to $324.00. If you switch to tax-inclusive pricing instead, the same figures mean $270 already contains the tax: the tool shows $45.00 of VAT within it. Either way, you can see every intermediate figure on screen before you download.
How taxes work on invoices
Different countries tax invoices differently, so this tool stays flexible instead of hardcoding one system. Enable the tax option, name it to match your situation (VAT in the United Kingdom and European Union, GST in Australia and India, GST/HST/PST in Canada, or Sales Tax in the United States) and set the percentage you charge. You can mark your prices as tax-exclusive (tax added on top of your rates) or tax-inclusive (tax already built into your rates), and override the rate on individual line items when some items are taxed differently.
VAT and sales tax work differently at a mechanical level: VAT is generally collected at each stage of the supply chain with an input-tax credit for registered businesses, while sales tax is generally collected once, at the final sale to the consumer. See the FAQ below for the full comparison.
Tax requirements vary by country and business. Please verify applicable tax rules with a qualified professional. If you bill Indian customers under GST specifically, KaroDesk also offers a dedicated GST invoice generator with CGST/SGST/IGST splits, and a GST calculator for quick checks.
How to create an international invoice
Billing a client abroad works exactly like billing locally, with two extra decisions. First, pick the currency your client expects to pay in: the generator supports 35 currencies including USD, EUR, GBP, CAD, AUD, NZD, INR, SGD, AED, SAR, JPY, CNY, CHF, SEK, NOK, DKK, ZAR, BRL and MXN, each formatted with its correct symbol and number style. Second, make sure both addresses include the country and postal or ZIP code, and add your tax registration number (VAT number, ABN, EIN and similar) in the tax ID field so your client’s accounting team can process the invoice without follow-up questions.
The tool does not convert currencies. You choose the invoice currency and enter prices in that currency, which keeps you in full control of the amounts you bill.
Who can use this invoice generator?
The generator is deliberately general-purpose so it fits almost any business that bills for its work:
- Freelancers billing for design, writing, development or creative work on a per-project or hourly basis.
- Consultants invoicing retainers, workshops and advisory engagements with clear payment terms.
- Agencies sending itemised invoices for campaigns, sprints and deliverables.
- Small businesses and trades that need a quick, correct bill without accounting software.
- Service providers such as tutors, cleaners, photographers and repair professionals.
- Online businesses charging international customers in their own currency.