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About this tool
Run a local inert structural audit of pasted HTML for common accessibility markup issues without rendering or fetching the page.
WCAG Quick Auditor tokenises pasted HTML as inert text and runs 19 deterministic structural checks against it — missing lang, empty or skipped headings, images without alt, unlabelled form fields, unnamed buttons and links, duplicate IDs, untitled iframes, tables without headers, missing or duplicated main landmarks, and positive tabindex values. Nothing is rendered, no script runs, and no URL is fetched, so it reports what the markup says rather than what the page does. It is for developers and content editors who want the obvious markup failures caught before a real accessibility review.
Open WCAG Quick Auditor on AltFTool — it loads instantly in your browser.
Paste markup into Source to inspect, or press Choose local file to load a .html, .htm or .txt file, up to 750,000 characters.
Press Run structural audit; the source is tokenized as text and never inserted into the page DOM.
Review Findings and the Structural inventory counts, then press Copy counts-only report for a summary with no source or locations.
A button counts as named if it has visible text, an aria-label, an aria-labelledby target, a title, or a native default like Submit — so it does not flag controls that are already labelled indirectly.
Findings are split into error severity for deterministic failures like a missing alt attribute and warning severity for heuristics like a missing h1 that a human has to decide on.
The exported summary contains counts and generic rule names only — no source HTML, text content, attributes, IDs, URLs, snippets, or line locations.
No. It runs 19 structural markup checks and cannot test colour contrast, CSS, layout, zoom and reflow, focus visibility, keyboard behaviour, dynamic states, media, timing, or how a screen reader actually announces the page. Automated checks typically catch only a minority of real accessibility barriers, so treat a clear result as a starting point and follow it with manual and assistive-technology testing.
Errors are checks with a definite answer in the markup — no lang attribute, an img with no alt, a form field with no accessible name, a duplicate id, an iframe with an empty title, a data table with cells but no header cells, a positive tabindex, or more than one main landmark. Warnings are heuristics needing human judgement, such as no h1, a skipped heading level, a table with no caption, or a personal-data field with no autocomplete cue.
Up to 750,000 characters; anything beyond that is truncated and the result says so. Each finding lists up to 8 example locations, while the count reflects every match.
An empty alt correctly marks a purely decorative image, so it is not an error on its own — it is only flagged when the same element also carries role="img", because that combination tells assistive technology the image is meaningful while giving it no name. Pick one: drop the role for decoration, or write real alt text.