What gets extracted from a Stack Overflow page
The question title becomes # H1. The question body comes through as content with its code blocks intact (language hints preserved from the <code class="language-python"> attribute Stack Overflow adds). The accepted answer is marked with a leading ✓ Accepted and its score in the heading (## ✓ Accepted Answer · 215 points). The top three alternative answers follow as their own sections with their scores. Comments under each post are preserved as sub-blockquotes with author attribution. Stripped: the right sidebar, the "linked questions" panel, the navigation, the ads, the cookie banner, the "hot network questions" footer.
Code blocks survive with language hints
The single most valuable thing on Stack Overflow is the code in the answers. Stack Overflow tags every code block with a language attribute (language-python, language-bash, language-rust) which our converter maps to the corresponding fenced Markdown code block. Inline <code> stays as backticks. The result is syntax-highlightable in any Markdown viewer or directly executable when copied to a REPL. If the answer is a technical PDF buried in the question, also try PDF to Markdown for the attachment.
The personal-knowledge-base use case
Common workflow: encounter a Stack Overflow answer that solves a problem you'll see again, convert the page, save the .md into your notes vault (Obsidian, Logseq, plain folders) under a topic-organised path. Months later, your local search hits your saved answer faster than re-Googling. Vote counts in the converted output give you a rough quality signal even after the search ranking on Stack Overflow itself has changed.