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Design templates once.
Render the document you need.

Velkin is an open templating studio for PDF, DOCX, XLSX, and HTML. Author with Handlebars, preview in the browser, ship over a REST API.

Get started
The Studio

Author, preview, and ship — in the browser

Edit templates with Handlebars helpers, bind JSON data, and preview the rendered document — all in one browser workspace.

The Velkin Studio: template editor with a document preview alongside project and version-history panels
Why Velkin

Built for teams that own their stack

Version control built in

Commit your changes, diff any revision line by line, and restore an earlier version in one click — history lives with the project.

Self-hosted & secure

Runs entirely on your own infrastructure. Chromium renders with JavaScript disabled, and an SSRF guard blocks private-network and file access by default.

A clean REST API

Render PDF, DOCX, and XLSX — and manage projects, commits, and history — programmatically over a JSON REST API.

Output formats

PDF from anything, native when you need it

Author in HTML, DOCX, or XLSX with Handlebars. Every template renders to a print-ready PDF — and each can ship in its native format too.

PDFPrint-ready from any template — Chromium for HTML, LibreOffice for Office files.
DOCXWord templates with Handlebars placeholders, rendered back as editable .docx.
XLSXExcel templates with formulas and styling preserved, filled from your data.
HTMLRendered HTML, ready to serve to the web or preview in the Studio.

Ready to render?

Velkin is open source and self-hosted — get the Studio and the REST API running on your own infrastructure in minutes.

Quick startView on GitHub