What Markdown elements does this tool support?

Headings (H1–H6), bold, italic, bold-italic, strikethrough, inline code, fenced code blocks with language labels, blockquotes (including nested), unordered and ordered lists, tables, horizontal rules, and links.

Does this tool support GitHub Flavored Markdown (GFM)?

The renderer supports the core GFM extensions including strikethrough (~~text~~), fenced code blocks with language hints, and tables. Task lists (- [ ] checkboxes) are not currently supported.

Is my Markdown saved between sessions?

No. The editor content is held in browser memory and is cleared on page refresh or tab close. Copy your content before leaving if you want to preserve it.

Can I embed images in the Markdown?

You can use standard Markdown image syntax (![alt](url)) but AlteredIdea does not load external URLs. Images embedded as data URLs will render correctly.

Is this tool suitable for writing README files?

Yes. The supported elements match what GitHub renders for README.md files, making this a good way to preview documentation before committing to a repository.

Does the preview load any external resources?

No. All rendering is performed with a custom Markdown-to-HTML parser running in your browser. No external fonts, stylesheets, or scripts are fetched.

Can I expand the editor or preview to full screen?

Yes. Each panel has an Expand button in its header that enlarges it to fill the viewport, useful for writing long documents or reviewing complex tables.

How do I create a table in Markdown?

Use pipe characters to separate columns and a separator row of hyphens under the header: | Name | Age | followed by | --- | --- | and then your data rows. The preview renders this as a formatted HTML table.

Markdown Preview

Live Markdown editor with instant preview, HTML source, and word count stats.

117 words46 lines681 characters

Editor

Welcome to Markdown Preview

This is a live Markdown editor. Type on the left, see the preview on the right.

Features

Bold text and italic text
Inline code and code blocks
Links
Tables and blockquotes

Code Example

javascriptfunction greet(name) {
  return `Hello, ${name}!`;
}

This is a blockquote. It can span multiple lines.

Table

Name	Age	Role
Alice	30	Engineer
Bob	25	Designer

Ordered List

First item
Second item
Third item

Strikethrough

~~This text is struck through~~

Nested Blockquote

First level

Second level nested

Free online Markdown editor with live preview

Markdown is the standard format for README files, documentation, wikis, and technical writing. Being able to preview rendered output without committing to a git repo or pasting into a GitHub editor saves time when drafting content. This live Markdown preview tool renders your content as you type, supporting headings, tables, code blocks, blockquotes, and all common Markdown elements.

The HTML Source tab lets you inspect the raw HTML generated from your Markdown, which is useful when you need to copy the rendered HTML for a CMS, email template, or static site. Word count, line count, and character count update in real time so you can track document length. Everything runs locally: no sign-up, no data transmission, no external dependencies.

Step-by-step guide

1
Write or paste Markdown
Type Markdown directly into the editor on the left, or paste existing Markdown content from a README, documentation file, or note.
2
See the live preview
The preview panel on the right renders your Markdown in real time as you type, showing formatted headings, lists, tables, and code blocks.
3
Switch to HTML Source view
Click the HTML Source tab on the preview panel to see the raw HTML generated from your Markdown: useful for debugging rendering or copying the HTML output.
4
Check the stats bar
The stats bar at the top shows word count, line count, and character count, updating live as you type.
5
Copy Markdown or HTML
Use the Copy Markdown or Copy HTML buttons in the stats bar to grab either the raw Markdown source or the rendered HTML output.

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Frequently Asked Questions

What Markdown elements does this tool support?: Headings (H1–H6), bold, italic, bold-italic, strikethrough, inline code, fenced code blocks with language labels, blockquotes (including nested), unordered and ordered lists, tables, horizontal rules, and links.
Does this tool support GitHub Flavored Markdown (GFM)?: The renderer supports the core GFM extensions including strikethrough (~~text~~), fenced code blocks with language hints, and tables. Task lists (- [ ] checkboxes) are not currently supported.
Is my Markdown saved between sessions?: No. The editor content is held in browser memory and is cleared on page refresh or tab close. Copy your content before leaving if you want to preserve it.
Can I embed images in the Markdown?: You can use standard Markdown image syntax (![alt](url)) but AlteredIdea does not load external URLs. Images embedded as data URLs will render correctly.
Is this tool suitable for writing README files?: Yes. The supported elements match what GitHub renders for README.md files, making this a good way to preview documentation before committing to a repository.
Does the preview load any external resources?: No. All rendering is performed with a custom Markdown-to-HTML parser running in your browser. No external fonts, stylesheets, or scripts are fetched.
Can I expand the editor or preview to full screen?: Yes. Each panel has an Expand button in its header that enlarges it to fill the viewport, useful for writing long documents or reviewing complex tables.
How do I create a table in Markdown?: Use pipe characters to separate columns and a separator row of hyphens under the header: | Name | Age | followed by | --- | --- | and then your data rows. The preview renders this as a formatted HTML table.

AlteredIdea vs alternatives

vs server-side tools: Everything runs in your browser: your data never leaves your device.