📝 Markdown Editor ☆

Overview

Markdown Editor is a clean Markdown editor with a live preview pane. Write on the left, see the rendered document on the right: headings, bold and italic, strikethrough, inline code, fenced code blocks, links, images, ordered and unordered lists, blockquotes and horizontal rules. Live word and character counters help you track length, and every export is one click away, copy the rendered HTML to the clipboard, download the .md source, or download a complete .html page ready to open in any browser. The renderer escapes all input and sanitizes URLs, so pasted content cannot inject scripts. Everything runs locally in your browser; nothing is uploaded and the editor keeps working offline.

How the editor renders Markdown

The source is parsed into HTML with a sanitizing renderer, so headings, emphasis, lists, code fences, tables and links display exactly as a documentation platform would render them. Exports cover the three common destinations: copy the rendered HTML for CMS fields, download the .md source for repositories, or download a complete standalone .html page that opens in any browser. Since the renderer escapes input and restricts URL schemes, pasted content cannot inject scripts into the preview or the exported page.

Capabilities and constraints

Property	Markdown editor behavior
Editing	Split view: source left, live preview right
Syntax	Headings, emphasis, strikethrough, code, links, images, lists, quotes, rules, tables
Counters	Live word and character counts
Exports	Rendered HTML to clipboard, .md source, standalone .html page
Safety	Input escaping and URL sanitization in the renderer
Processing	100% client-side; nothing uploaded
Cost	Free, no account, no ads

Privacy: drafts stay in the browser

Drafts, internal documentation and unpublished posts are sensitive before release. The editor never transmits content: nothing is stored or logged, and the page works offline after loading.

Markdown workflows that work

• Use one blank line between blocks, most rendering surprises come from spacing.
• Fence code blocks with three backticks and a language tag for highlighting.
• Preview tables carefully: alignment syntax is easy to mistype.
• Keep image URLs absolute when the Markdown will move between platforms.
• Download the .md as the source of truth; export HTML only for delivery.

Related: browse the text tools for counters, diffs and converters.

Live preview, storage and export

A Markdown editor is only as useful as the way it handles state, because writing happens in many short sessions. Autosave to local storage is the feature that matters most: it survives a closed tab and a browser crash without sending drafts anywhere. The preview should update as you type without stealing the cursor, and synchronized scrolling keeps the line you are editing visible on the right. Syntax support is the next question: strict CommonMark covers the basics, while GitHub-flavoured Markdown adds tables, task lists, strikethrough, footnotes and fenced code with language hints. Keyboard shortcuts for bold, italic, links and lists save real time, and a toolbar helps when you do not remember the syntax. Export is the practical endpoint: raw Markdown for version control, rendered HTML for the web, and PDF when the document needs to be fixed and shared. Two privacy points are worth stating: local storage is per-browser and can be cleared by the user or by the browser under storage pressure, so important drafts should be copied out; and any preview that renders raw HTML can execute scripts if the content comes from an untrusted source. Everything here runs client-side, so notes, drafts and credentials never leave your device.