In today’s freelance and small business world, creating professional invoices shouldn’t cost a fortune or lock you into proprietary software. Enter open source invoice generator GitHub projects—these free, customizable tools let you generate PDFs, manage billing, and scale effortlessly. We’ve curated the top 4 open source invoice generators on GitHub based on stars, features, and ease of use. All are MIT-licensed (except one AGPL), actively maintained, and perfect for developers or entrepreneurs. Let’s dive in.
1. Invoify by al1abb – The Full-Featured Web App
With over 6.1k stars, Invoify tops our list as a complete open source invoice generator on GitHub. Built with Next.js, TypeScript, and Shadcn UI, it offers form-based creation, live previews, and exports to PDF, JSON, XLSX, or CSV. Key perks: Email sending via Nodemailer, customizable templates, and i18n support. Ideal for teams needing quick, professional outputs without setup hassle.
Stars: 6.1k | Forks: 659 | Last Update: Recent (2k+ commits)
Pro Tip: Integrate it into your workflow for automated billing—fork and deploy in minutes.
2. TinyPDF by Lulzx – Lightweight PDF Magic
If minimalism is your vibe, TinyPDF (857 stars) is a gem among open source invoice generators on GitHub. This zero-dependency TypeScript library (<400 LOC) crafts real PDFs with text, shapes, images, and even Markdown conversion. It shines for invoices via a ready-made example: headers, item tables, totals, and footers in ~50 lines.
Stars: 857 | Forks: 33 | Last Update: Dec 19, 2025
Why It Rocks: Embed it in any JS project for dependency-free invoice gen—no bloat, just results.
3. HTMLDocs by htmldocs-js – React-Powered Templates
For design-savvy users, HTMLDocs (685 stars) reimagines PDFs like LaTeX but with React, JSX, and Tailwind. As a top open source invoice generator GitHub pick, it supports dynamic props for customer data, flexbox layouts, and real-time previews. Render invoices as reusable components—think Stripe-like polish without the fees.
Stars: 685 | Forks: 31 | Last Update: Recent (215+ commits)
Standout Feature: Hot-reloading server for tweaking templates on the fly.
4. Easy Invoice PDF by VladSez – Browser-Only Simplicity
Rounding out our list, Easy Invoice PDF (335 stars) delivers instant, client-side magic. This React/Next.js tool uses @react-pdf/renderer for live previews, VAT calc, multi-language support, and shareable links—no servers needed. A stellar open source invoice generator on GitHub for privacy-focused solos.
Stars: 335 | Forks: 19 | Last Update: Nov 19, 2025
Bonus: Mobile-responsive and template-flexible—download PDFs in seconds.
Why Go Open Source for Invoices?
These open source invoice generators on GitHub save time, money, and headaches with full customization and community backing. Whether you’re a dev scripting automations or a hustler needing quick PDFs, start forking today.
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an I customize these open source invoice generators?
Absolutely. edit the source code for templates, layouts, colors, languages, or add features like tax calculations fork the repo to start.
Do they support PDF exports and downloads?
Most do, using libraries like pdf-lib or @react-pdf/renderer for generating downloadable PDFs directly from the tool.
Are these tools secure for handling sensitive data?
As open source, security depends on your implementation use self-hosting for privacy, and review code for vulnerabilities before use.
