Markdown Preview

Markdown Preview is a free, private Markdown editor with a live preview. Everything stays on your device (IndexedDB), so no sign-up and no server storing your notes. Features: GitHub Flavored Markdown, callouts, footnotes; KaTeX math and Mermaid diagrams; syntax highlighting for 180+ languages; Present mode turns any doc into slides with speaker notes; open GitHub/GitLab files from a link; tabs, outline, auto snapshots, custom CSS; export to PDF/HTML/.md or copy as rich text into Gmail/Docs/Slack; installable PWA, works offline. Free, no tiers, no watermark.