Weekend Projects Easy 9,900/mo

PDF Invoice Generator

API to generate professional PDF invoices from JSON data. Send invoice data, get a beautiful PDF back — perfect for SaaS billing and freelancers.

APIFinance
MRR Potential
$3K–$10K
Time to MVP
1 weekend
Search Volume
9,900/mo
Market Size
$800M

The Problem

Generating PDF invoices programmatically requires complex libraries. Stripe invoices are basic and unbranded. No simple API takes JSON and returns a branded PDF invoice. Custom invoice generation is a 2-week engineering project.

The Solution

Invoice generation API — send JSON with line items, customer details, and branding, get a professional PDF invoice back in milliseconds. Templates and tax calculation included.

Target Audience

SaaS companies generating invoices, freelancers creating professional invoices, and e-commerce platforms automating order invoices

Key Features

1
REST API accepting JSON and returning branded PDF invoices
2
10+ professional invoice templates with custom branding
3
Multi-currency support with proper formatting for 150+ currencies
4
Tax calculation with VAT, GST, and sales tax support
5
Recurring invoice scheduling with automatic generation
6
Invoice tracking with payment status and due date reminders

Market Opportunity

Market Size
$800M — Invoicing and billing automation
Monthly Searches
9,900/mo
MRR Potential
$3K–$10K
Why Now?

Every SaaS needs invoicing. API-first billing is the trend. Freelancer economy is growing. PDF generation should not require engineering effort.

Revenue Model

Free: 50 invoices/mo. Pro: $9/mo (500 invoices + custom templates). Business: $29/mo (5K invoices + branding + tax). Annual: 20% discount.

Competitive Landscape

Stripe Invoicing

Stripe invoices. 0.4%/invoice, basic templates, Stripe ecosystem

Invoice Ninja

Invoicing app. Free to $12/mo, full app, not API-first

Wave

Free invoicing. Full accounting, not API-first

Custom PDFKit code

2+ weeks engineering, pixel-perfect PDF is hard

Recommended Tech Stack

Next.jsPuppeteer/React-PDFNode.jsVercelStripe

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