DEV3 Free Invoice Generator — Source Code (React + Tailwind)

Source code of the DEV3 Invoice Generator, a full invoicing form with line items, per-line or flat tax, discounts, logo upload and a PDF writer, with the draft kept in local storage.

Free download: sign in to any DEV3 account and click Download ZIP. Try it live: https://dev3.tech/tools/invoice-generator shows the finished tool running.

What is in the download

• A standalone Vite + React + TypeScript + Tailwind CSS project: src/tool holds the tool, shared pieces sit beside it
• package.json with exact versions plus a lockfile, so npm ci works
• README.md (run, build, embed in Next.js or plain React) and an MIT LICENSE

What the code does

• Three PDF templates with accent colour
• Per-line tax, inclusive prices and discount handling
• Currency formatting and amount in words
• Autosaved draft in the browser

Tech stack

React 19, TypeScript, Vite, Tailwind CSS 4, jspdf.

Install and customise

The How to install and How to use tabs list the steps. In short: unzip, npm ci, npm run dev, then copy the tool folder into your own app if you want to embed it.

Good to know

• A browser-only tool: there is no backend or database in the code.
• Invoice requirements differ by country; check numbering and tax wording with an accountant.