CleanorTools
Markdown

Markdown Editor

Details

How to use Markdown Editor

What the tool does, how to run it, and what to expect from the result.

How to use the Markdown editor

To use the editor, type your Markdown directly or paste an existing block into the input pane. The preview pane renders the result instantly using GitHub-flavored Markdown, so you can confirm headings, links, tables, and code blocks look right as you write.

When you are done, copy the source to your clipboard or download it as a .md file. The editor keeps the focus on the core writing loop, write, check the rendering, keep moving, rather than trying to be a full IDE with plugins and themes.

Everything stays local in your browser. Your content is never uploaded to a server, so the editor is safe for private notes, drafts, and documentation.

  • Type or paste Markdown in the input pane
  • Watch the live GFM preview update
  • Copy the source or download a .md file

What GitHub-flavored Markdown supports

GitHub-flavored Markdown (GFM) extends standard Markdown with features that documentation and READMEs rely on. This editor supports GFM tables, task lists, fenced code blocks, strikethrough, and autolinks, so the preview matches how your content will look on GitHub.

That makes it a practical place to draft README sections, issue and pull request text, changelog entries, or any docs you plan to publish on a platform that uses GFM. What you see in the preview is what you can paste into those tools.

Because the same local rendering powers the preview, you get a reliable check of your formatting without ever sending the content anywhere.

Tips

Getting a better result out of Markdown Editor

Specific settings and thresholds, not general advice.

  • Rendering runs with GFM on and breaks off, the same combination GitHub uses for README files. A single newline is therefore not a line break. To force one inside a paragraph, end the line with two spaces or leave a blank line.
  • The preview re-renders on every keystroke and the word, character, heading, link, and list counters update with it, so you can watch a section approach a length target while you write instead of pasting it into a counter afterwards.
  • The HTML is passed through DOMPurify before it reaches the preview, so a script tag or an onclick attribute pasted into your source renders as nothing. That is sanitization, not a parsing failure in your Markdown.
  • There is no autosave and no local storage. The document lives in the tab. Download the .md, which saves as notes.md, before you close it or reload.
  • The editor opens with a sample document already in the box. Select all and delete before you paste, otherwise your content lands underneath the demo table.
Limits

What Markdown Editor does not do

The honest boundary, so you do not lose time finding it yourself.

  • No autosave, no local storage, no document list. Closing the tab loses the text.
  • No file open. You paste or type; you cannot drag a .md file in.
  • No syntax highlighting, formatting toolbar, or keyboard shortcuts in the source pane.
  • No Mermaid diagrams, LaTeX math, YAML front matter handling, or GitHub alert callouts.
Reference

Terms used on this page

Short, plain-language definitions for the formats and settings above.

Files & formatsMarkdownMarkdown is a lightweight, plain-text formatting syntax that turns simple symbols into formatted text — `#` for headings, `*` for emphasis, and `-` for lists. It stays readable as raw text and converts cleanly to HTML.General
At a glance

Who Markdown Editor is for

A quick way to understand who this helps, what it solves, and where it connects next.

Best fit

Founders, docs writers, developers, SEO teams, and product people drafting Markdown content fast.

Ideal for

Writing README sections, docs snippets, release notes, and support content without opening a heavier editor.

FAQ

Common questions

Short answers for the questions people usually have before trying a utility like this.

Is the Markdown editor free?

Yes. This Markdown editor is completely free to use, with no sign-up and no limits.

Does it support GitHub-flavored Markdown?

Yes. The editor supports GFM tables, task lists, fenced code blocks, strikethrough, and autolinks.

Does my content leave the browser?

No. Writing, preview, and export all stay local in your browser, so your content is never uploaded.

Can I download my Markdown?

Yes. You can copy the source to your clipboard or download it as a .md file directly from the editor.

Does it work on mobile?

Yes. The editor runs in any modern browser, including mobile, since all processing happens on your device.

Why did my single line breaks disappear in the preview?

The renderer is configured with breaks set to false, which is the CommonMark and GitHub README behavior: consecutive lines join into one paragraph. Editors like Obsidian and chat apps like Discord default the other way, which is why text pasted from them looks collapsed here. End a line with two trailing spaces, or insert a blank line, to force a break.

Does it autosave my work?

No. Nothing is written to disk, to local storage, or to a server. That is a privacy decision, and it has a cost: a reload loses the document. Use Download .md at natural stopping points.

Which Markdown flavor does it support?

GitHub Flavored Markdown as implemented by marked: tables, task lists, strikethrough, fenced code blocks, and autolinks all work. GitHub extensions that live outside the spec, such as > [!NOTE] alert callouts and Mermaid code blocks, render as a plain blockquote and a plain code block.

Can I paste raw HTML into the Markdown?

Yes, and ordinary tags like <details>, <sub>, and <kbd> render. Anything DOMPurify considers unsafe, meaning script tags, event-handler attributes, and javascript: URLs, is removed from the preview. The source you copy and download is untouched; only the rendered view is sanitized.

Does my writing leave the browser?

No. Rendering, counting, copying, and the .md download all happen in the tab. Nothing is uploaded, which is the reason drafts of unreleased release notes are safe to write here.

How do the live counters treat code blocks?

Fenced and inline code are removed before words are counted, so a document that is mostly code reports a low word count. The character count is different: it is the raw length of the source, including every backtick and hash. The two numbers are measuring different things on purpose.

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