Why wrap the output in a main element?

The main landmark marks the primary content of the page so assistive technology can skip repeated navigation and headers. WCAG techniques such as ARIA11 recommend exactly one main landmark per page, and most page templates omit it.

When does the tool inject an h1?

If your Markdown contains no level-1 heading, a visually hidden h1 is added at the top. Every page should have exactly one h1 so screen-reader users can understand the document outline and jump to the main heading.

How are standalone images handled?

An image on its own line is promoted to a figure element with the alt text repeated as a visible figcaption. This gives sighted and screen-reader users the same caption. An image with empty alt is treated as decorative and left as a bare img.

What Markdown features are supported?

Headings, bold, italic, inline code, links, images, ordered and unordered lists, blockquotes, fenced code blocks, and paragraphs. It is a focused subset aimed at clean, accessible output rather than full CommonMark coverage.

Is my content sent anywhere?

No. The parser and all accessibility transforms run in your browser, so your Markdown never leaves your device. Internal or unpublished documents are safe to convert.

Markdown to Accessible HTML Converter

The Markdown to Accessible HTML Converter turns Markdown into semantic HTML and then applies a layer of accessibility fixes that a plain parser skips. Most converters emit a flat run of headings and paragraphs with no landmarks, no guaranteed top-level heading, and bare <img> tags. This tool produces markup that screen-reader users can navigate.

How it works

Parse. A focused Markdown subset is parsed: headings (# to ######), **bold**, _italic_, `inline code`, [links](url), ![images](url), ordered and unordered lists, blockquotes, and fenced code blocks. Inline HTML special characters are escaped.
Wrap in a landmark. The whole body is placed inside <main lang="en"> so the primary content is a single, addressable region. Exactly one main per page is the accessibility expectation.
Guarantee an h1. If no level-1 heading exists, a visually hidden <h1> is injected so the document has one top-level heading and a sound outline.
Promote images to figures. A standalone image line becomes <figure><img><figcaption>…</figcaption></figure>, with the alt text shown as the caption. Images with empty alt are treated as decorative.

Example

The input ![Revenue chart showing 20% growth](chart.png) on its own line becomes a figure whose figcaption reads “Revenue chart showing 20% growth”, giving everyone the same caption text.

Tips and notes

Pair the visually-hidden class with real CSS in your stylesheet so the injected h1 is hidden visually but still read aloud.
Always write meaningful alt text for content images so they are promoted to captioned figures rather than left bare.
Run the output through the Landmark Region Completeness Checker to confirm the structure before shipping.