01 Import · Reorganize · Download

Make every lecture
worth reading.

Upload a lecture HTML file. Jang extracts its academic content, images and diagrams, asks Gemini to reorganize it, then creates a polished, printable HTML document.

Browser-first extraction No account required Downloadable HTML

Workspace

Rebuild a lecture

HTML stays on your device until the extracted text is sent for restructuring.

Choose the sourceOne .html or .htm file

Drop lecture HTML here or click to browse Up to 50 MB desktop / 20 MB mobile · adaptive safe processing

Set the detailsOptional metadata for the cover

Course code Lecture label Instructor Language

Table of contentsAdd an overview page Concise modeReduce repetition

The Gemini key is stored only as a Cloudflare secret and is never exposed to visitors.

Your redesigned lecture appears here

Jang will show the generated pages in a safe preview before you download them.

The pipeline

Four clear steps. One clean file.

Import

Select a lecture HTML file. Parsing happens locally in the visitor’s browser.

Extract

Headings, paragraphs, lists, tables, embedded images, SVG and Mermaid diagrams are identified.

Rebuild

Gemini creates a content plan while preserving the lecture’s meaning and factual detail.

Download

A self-contained, printable HTML lecture is rendered and returned to the visitor.

Make every lectureworth reading.