Built with open source

tinkforge is free and private because it stands on the work of others. Thank you to every project below — please go star them.

Engine

• qpdf (Apache-2.0) — the PDF engine, compiled to WebAssembly, behind split, merge, rotate, page removal and compression.
• pdf-lib (MIT) — the second engine, for building PDFs from images and stamping watermarks.

Rendering

• PDF.js (Apache-2.0) — page thumbnails, preview, and PDF-to-image export.
• react-pdf (MIT) — React bindings for PDF.js.
• PDFium JBIG2 decoder (BSD-3-Clause) — decodes scanned (JBIG2) images, via PDF.js.
• OpenJPEG (BSD-2-Clause) — decodes JPEG 2000 images, via PDF.js.
• qcms (MIT) — colour management, via PDF.js.

Framework

• Astro (MIT) — the static site shell.
• React (MIT) — the interactive tool Island.

UI & styling

• Tailwind CSS (MIT) — utility-first styling.
• Radix UI (MIT) — accessible primitives.
• dnd-kit (MIT) — accessible drag-to-reorder for documents in Merge.
• class-variance-authority (Apache-2.0) — component variants.
• clsx (MIT) — className composition.
• tailwind-merge (MIT) — merging Tailwind classes.

Build toolchain

• Emscripten (MIT / LLVM) — compiles qpdf to WebAssembly.
• zlib (Zlib) — compression, bundled into the engine.
• libjpeg-turbo (BSD-3-Clause) — JPEG support, bundled into the engine.
• pako (MIT AND Zlib) — compression, bundled into pdf-lib.
• UPNG (MIT) — PNG decoding, bundled into pdf-lib.
• pdf-lib standard fonts (MIT) — metrics for the standard 14 PDF fonts, bundled into pdf-lib.

Full license texts for the components shipped to your browser are in our third-party notices.