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Markdown Accessibility (a11y) & Heading Linter

Audit Markdown documents against WCAG 2.2 accessibility standards for heading level skips, missing alt text, and ambiguous link text.

Presets:
a11y Score65 / 100
Issues Found5
Headings4
Images Checked1
Links Audited2
Document Under Audit23 lines
Audit Findings (5) Action Required
Skipped heading level from H1 directly to H3.
Line 5
### Authentication & Token Secrets
Fix: Structure headings hierarchically without skipping levels (e.g. use H2 before H3).
Image is missing an accessible alternative text (alt).
Line 7
![](https://example.com/assets/auth-flow.png)
Fix: Add descriptive alternative text inside the brackets, e.g. ![Architecture Diagram](...).
Ambiguous link text "click here". Users navigating with screen readers cannot determine destination out of context.
Line 9
[click here](https://example.com/oauth/authorize)
Fix: Use descriptive link text that explains where the link leads (e.g. 'Read the deployment guide').
Ambiguous link text "Read more". Users navigating with screen readers cannot determine destination out of context.
Line 18
[Read more](https://example.com/docs/webhooks)
Fix: Use descriptive link text that explains where the link leads (e.g. 'Read the deployment guide').
Duplicate heading title "Authentication & Token Secrets" can create ambiguous anchor IDs.
Line 20
### Authentication & Token Secrets
Fix: Differentiate subheadings to ensure clear landmark navigation.
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Complete Guide & Overview

Markdown Accessibility (a11y) & Heading Linter

Audit Markdown documents against WCAG 2.2 accessibility standards for heading level skips, missing alt text, and ambiguous link text.

How to Use the Markdown Accessibility (a11y) & Heading Linter

1

Input Content

Paste or compose your markdown or source data into the input editor.

2

Customize Settings

Select formatting options, syntax modes, or display options.

3

Copy or Download

Copy the processed output to your clipboard or download the generated file.

Key Features & Capabilities

Validates document outline for skipped heading levels (e.g. H1 followed immediately by H3).
Flags missing, empty, or redundant image alternative text for screen readers.
Catches ambiguous link anchor text like 'click here' and 'read more' to ensure accessible navigation.
Calculates an overall accessibility compliance score and generates an actionable Markdown report.

Frequently Asked Questions

Why is heading hierarchy important for accessibility in Markdown?

Screen readers rely on headings (H1 through H6) to generate a navigational outline for visually impaired users. Skipping levels (like jumping from an H1 directly to an H3) breaks the structural outline and causes confusion.

Why does the linter flag 'click here' link text?

Screen reader users frequently browse web pages by pulling up a list of links out of document context. Links titled 'click here' or 'read more' provide zero destination information, violating WCAG 2.4.4 Link Purpose guidelines.

Is any document content transmitted over the network?

No. All syntax checks and accessibility auditing execute 100% locally inside your web browser. No text is ever uploaded to a remote server.

Workflow Continuity

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