Markdown editor / live proof
01 Edit
02 Preview
Autosave 5s · IndexedDB
01 A desk built for long documents
Everything runs in your browser: rendering, syntax highlighting, diagrams, and storage. No accounts, no cloud, no upload.
01
Live proof, debounced
Typing re-renders the preview after a short debounce, so fast typing stays smooth while the preview is never more than a quarter-second behind.
02
Outline that navigates
Headings become a clickable table of contents with anchors. In long technical documents, the outline is the map — click to jump, and the active section is highlighted.
03
Scroll that follows
Scroll the editor and the preview tracks the heading you are writing; scroll the preview and the editor follows back. Long documents stop being a guessing game.
04
Code, highlighted
Fenced blocks get automatic syntax highlighting for JavaScript, Python, CSS, HTML, JSON, and dozens more languages via highlight.js.
05
Mermaid diagrams
Write a mermaid fenced block and flowcharts, sequence diagrams, and gantt charts render right in the preview — no image exports needed.
06
Autosave, locally
Every 5 seconds the document is written to IndexedDB, which handles large documents well beyond the 5MB localStorage ceiling. Reopen the page and MdGenr offers to restore the draft.
02 Markdown cheat sheet
The syntax this editor understands, at a glance.
| Syntax | You write | Result |
|---|---|---|
| Heading | ## Title | Section heading, added to the table of contents with an anchor |
| Bold / Italic | **b** / *i* | Bold and italic text |
| Strikethrough | ~~text~~ | |
| Inline code | `code` | Monospaced inline code with a subtle frame |
| Code block | ```js … ``` | Syntax-highlighted preformatted block |
| Task list | - [x] done | Checkbox list item (GFM) |
| Table | | a | b | | Formatted table with header row (GFM) |
| Blockquote | > quote | Indented quote with a red rule |
| Emoji | :rocket: | Renders as an emoji character |
| Mermaid | ```mermaid …``` | Flowchart / sequence diagram rendered inline |
| Link | [text](url) | Hyperlink |
| Image |  | Embedded image |
03 Three ways out
When the document is done, take it wherever it needs to go.
HTML
Publish-ready file
A standalone .html document with clean inline styles baked in: headings, code blocks, tables, and quotes all styled. Drop it on any static host and it looks right.
PDF
Print pipeline
Export PDF opens the browser print dialog on a print-optimized version of the document, with page margins and pagination handled by print CSS.
.MD
Raw source
Download the exact Markdown source as a .md file, named after the document's first heading, ready for Git, a README, or another editor.
04 FAQ
Is my Markdown content uploaded to a server?
No. MdGenr renders everything in your browser and saves to IndexedDB, a local database inside your browser. Nothing you write is transmitted anywhere, and clearing your browser data removes the local copy.
How does autosave work?
Every 5 seconds the current document is written to the browser's IndexedDB, which supports documents far larger than the 5MB localStorage limit. When you reopen the page after a refresh or crash, a bar appears asking whether to restore the last autosaved version.
Which Markdown extensions are supported?
Full GitHub Flavored Markdown: tables, task lists with checkboxes, strikethrough, fenced code blocks with syntax highlighting, plus emoji shortcodes like
:rocket: and mermaid diagram blocks that render as flowcharts and sequence diagrams.How do the editor and preview scroll together?
The editor tracks which line is at the top of the viewport, finds the nearest heading above that line, and scrolls the preview to that heading's anchor. Scrolling the preview moves the editor back to the matching heading line.
What export formats are available?
Three: a standalone HTML file with clean inline styles ready to publish, a PDF generated through the browser's print dialog with print-optimized pagination, and the raw .md file itself.
Does the table of contents work in exported HTML?
Headings in the exported HTML keep their anchor ids, so links like
#getting-started jump to the right section in the exported file.Built for people who write more than a paragraph
MdGenr is for anyone drafting technical docs, README files, or long-form notes in Markdown without wanting to fight a heavy editor. If you keep losing your place between raw syntax and rendered output, or you are tired of pasting into five different tools just to get a PDF, this sits in that gap. It handles the writing, the proofing, and the export in one screen so you stop context-switching. No account, no cloud sync, no telemetry — just your text, your browser, and a local autosave that remembers what you were working on.
From blank pane to exported file
- Click Sample to load demo content, or start typing and use H2 and H3 for structure.
- Format inline emphasis with B, I, and S; insert symbols, checkboxes, code blocks, or tables as needed.
- Watch the right pane update as you write, then use the outline to jump between sections.
- Click Restore to pull back an autosaved draft if your tab reloads or you closed it.
- Pick Export HTML, Export PDF, or Export .md depending on where the document goes next.
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