sourceprinter

Source Printer turns a zip full of student coding projects into syntax-highlighted PDFs. It parses the zip in the browser for preview, then sends the zip and settings to a stateless Node backend that renders PDFs and streams the download. Any programming language with a recognized file extension is supported.

• Docker image: https://hub.docker.com/r/haanlaurent/sourceprinter

Features

• Upload a zip containing multiple top-level project folders.
• Configure the project folder level when the zip nests projects deeper.
• Supports 40+ file extensions: .java, .py, .js, .ts, .c, .cpp, .cs, .go, .rs, .rb, .php, .swift, .kt, .scala, and many more.
• Parse embedded .umz archives (created by Unimozer Next) inside the uploaded zip (one nesting level; nested .umz inside .umz are ignored).
• Ignore hidden/macOS metadata files (for example entries under __MACOSX and files whose basename starts with .).
• Overview grouped by project, sorted by project then file name.
• Preview with adjustable font size, line height, color scheme, and font family.
• Language-agnostic filters: remove comments, collapse blank lines, tabs to spaces.
• Language-specific filters shown dynamically based on detected languages (e.g. Java: Remove Javadoc, Hide initComponents(), Hide main()).
• Per-file include checkboxes with preview selection.
• Output as a single PDF or a zip of per-project PDFs, with optional per-project page padding.
• Optional headers (project and file name/full path) and footer page numbers.
• Render progress with a live radial indicator (per-file progress).
• Highlighting via highlight.js with built-in themes: atom-one-light, arduino-light, stackoverflow-light, vs, monochrome.
• Settings persist in localStorage with a reset-to-defaults action.
• No files retained on the server (temp files are deleted after each request).

Run with Docker

For local development or a direct Node.js deployment, use Node.js 22.23.4+, 24.22.1+, or 26.12.1+ within those major versions. These minimum versions include the CVE-2026-111497 Brotli decoder fix. Dependency installation and backend startup reject older or unsupported runtimes.

Run the latest published image from Docker Hub: https://hub.docker.com/r/haanlaurent/sourceprinter

docker run --rm -p 8080:8080 haanlaurent/sourceprinter:latest

Then open: http://localhost:8080

Run a specific version tag:

docker run --rm -p 8080:8080 haanlaurent/sourceprinter:RELEASE_TAG

Build and run locally from this repository:

docker build --pull -t sourceprinter:local .
docker run --rm -p 8080:8080 sourceprinter:local

Deployment

See deploy/README-DEPLOY.md.

Existing images must be rebuilt and containers replaced to pick up runtime security fixes. Pulling latest only helps after a patched SourcePrinter image has been published. Check the runtime in a running container with docker exec sourceprinter node --version.

Related Project

Unimozer Next: https://github.com/haan/UnimozerNext