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Markdown Validator & Preview

Validate Markdown structure, preview rendered output, and catch common authoring issues before publishing.

Converty Markdown Showcase 🚀

Welcome to Converty's Markdown Validator & Preview. This sample demonstrates a broad Markdown feature set with live preview, sanitized raw HTML, and structural feedback before you publish.

Use italic text, bold text, strikethrough, inline code, and a forced line break.
This second line confirms the hard line break is preserved in the preview.

Press Cmd + Enter, write H2O, compare 210 with 2102^{10}, and keep secondary notes in footnotes.1

Made by VLG Software Version

Real Converty links

Autolink: https://github.com/remarkjs/remark-math
Email: hello@example.com
Reference link: Favicon generator

Lists and tasks

  1. Draft the document
  2. Review the structure
    • Confirm nested lists stay readable
    • Check inline formatting and links
  3. Publish with confidence
  • Headings organized
  • Tables aligned
  • Code fences labeled
  • Math rendered with KaTeX
  • Final proofread pending

Markdown stays readable in plain text and polished in preview.

Use the validator when you want quick feedback before publishing.

Table

ToolBest forStatus
CSV Validatorspotting structural issuesReady
Data ConverterJSON, YAML, TOML, and CSVReady
Favicon Generatorbrowser icon packagesReady
WebP Converterimage optimizationReady

Media

Converty preview image

Code samples

type ReleaseNote = {
  slug: string
  title: string
}

export function buildSummary(note: ReleaseNote) {
  return `${note.title} (${note.slug})`
}
pnpm lint
pnpm test
pnpm build
{
  "tool": "markdown-validator",
  "status": "ready",
  "supportsMath": true
}

Math

Inline math works: E=mc2E = mc^2, x2+y2\sqrt{x^2 + y^2}, and n=14n=10\sum_{n=1}^{4} n = 10.

f(x)=01x2dx=13f(x) = \int_{0}^{1} x^2 \, dx = \frac{1}{3} [1234][xy]=[x+2y3x+4y]\begin{bmatrix} 1 & 2 \\ 3 & 4 \end{bmatrix} \begin{bmatrix} x \\ y \end{bmatrix} = \begin{bmatrix} x + 2y \\ 3x + 4y \end{bmatrix}

Safe HTML extras

Safe raw HTML still appears after sanitization, while unsafe handlers and protocols are stripped out.

Why mix Markdown with sanitized HTML?

You can add disclosure widgets, keyboard hints, subscripts, and superscripts without opening the door to unsafe scripts or event handlers.


Need a quick route to the rest of Converty? Visit home, scan the FAQs, or browse the blog for longer reads.

This sample includes a footnote reference2 and keeps reference definitions separate from footnotes so reference links resolve correctly.

Footnotes

  1. KaTeX renders both inline and display equations inside the preview.

  2. The validator can still map warnings back to source lines and preview blocks.

No issues detected
No validation issues were found for the current Markdown document.

About Markdown validation and preview

Markdown validators are most useful when they combine a real preview with targeted authoring feedback. That helps you review both how the document looks and whether it carries common structural or accessibility issues.

Preview before publishing

A rendered preview helps you catch formatting surprises before Markdown reaches docs, CMS fields, release notes, or product copy.

Seeing headings, tables, blockquotes, and code blocks in their final shape makes review faster.

Safe raw HTML rendering

Markdown often allows inline HTML, but public previews should still strip unsafe scripts, handlers, and bad protocols.

Sanitization lets you test realistic output without trusting the source markup.

Authoring warnings that matter

Focused warnings catch problems such as heading jumps, duplicate H1 usage, missing alt text, empty links, and unlabeled code fences.

That gives authors practical feedback without turning Markdown into a heavyweight lint workflow.

Frequently asked questions

Answers about GitHub-flavored Markdown support, safe HTML rendering, authoring warnings, and what the preview does with suspicious markup.

Other tools

Browse every dedicated tool page from the homepage hub or the centered header selector.