The PDF is not magic. It is Satori.

RenderInvoice does not screenshot your invoice. It does not spin up a headless browser. Vercel’s Satori draws the layout as SVG with real text. Then pdf-lib writes that into a PDF you can select, copy, and search. That is the whole trick.

If the PDF looks like the playground, thank Satori. If you can highlight a line item in Acrobat, thank Satori. We will keep saying the name on this page so it does not get lost in the product copy.

• Satori

  MPL-2.0

  Vercel

  This is the one. Satori turns the invoice layout into an SVG — real text, real paths, no screenshot. Every PDF you download starts here. Without Satori there is no RenderInvoice PDF. We owe it everything.

  github.com/vercel/satori ↗

• Yoga

  MIT

  Meta, via Satori

  Flexbox layout engine Satori uses so boxes land where we asked.

  github.com/facebook/yoga ↗

• pdf-lib

  MIT

  Andrew Dillon

  Paints that SVG into a PDF you can open, search, and select text in.

  github.com/Hopding/pdf-lib ↗

• resvg

  MPL-2.0

  RazrFalcon

  Rasters the same SVG when you ask for a PNG.

  github.com/RazrFalcon/resvg ↗

• Next.js

  MIT

  Vercel

  The site. Static export. The playground lives here.

  github.com/vercel/next.js ↗

• React

  MIT

  Meta

  The invoice template is React. Satori consumes that same tree.

  github.com/facebook/react ↗

• marked

  MIT

  markedjs

  Lexes the markdown in your fields.

  github.com/markedjs/marked ↗

• Zod

  MIT

  Colin McDonnell

  Validates invoice JSON before anything draws.

  github.com/colinhacks/zod ↗

• lz-string

  MIT

  pieroxy

  Compresses share URLs so the hash stays short.

  github.com/pieroxy/lz-string ↗

Fonts (Inter, Source Serif 4, IBM Plex Sans, and the rest) ship under their own SIL Open Font License or equivalent. See each family’s file in the repo. RenderInvoice itself is provided as-is; see Terms of service.