Accessibility tool

100% In-Browser

Screen Reader Simulator

Paste HTML to preview a simplified reading order with headings, landmarks, links, buttons, images, fields, and text content.

HTML markup

This is a planning aid for reading order and labels. Always test important interfaces with real assistive technology.

Simulation

Reading Order

{readingItems.length} stops

Headings

Links

Controls

Images

1 / text
<main> <header> <h1>Quarterly Report</h1> <nav aria-label="Report sections"> <a href="#summary">Summary</a> <a href="#details">Details</a> </nav> </header> <section aria-labelledby="summary"> <h2 id="summary">Executive summary</h2> <p>Revenue grew across three product lines.</p> <button>Download report</button> </section> <img src="chart.png" alt="Bar chart showing steady revenue growth" /> </main>

Transcript

Simulated Speech

1. <main> <header> <h1>Quarterly Report</h1> <nav aria-label="Report sections"> <a href="#summary">Summary</a> <a href="#details">Details</a> </nav> </header> <section aria-labelledby="summary"> <h2 id="summary">Executive summary</h2> <p>Revenue grew across three product lines.</p> <button>Download report</button> </section> <img src="chart.png" alt="Bar chart showing steady revenue growth" /> </main>

Paste HTML to inspect its likely reading order.

Overview

What Is a Screen Reader Simulator?

A Screen Reader Simulator models how assistive technologies—such as NVDA, JAWS, VoiceOver, and Orca—interpret and announce web content to visually impaired, blind, or neurodivergent users. Rather than relying on a visual 2D display, screen readers convert the browser's internal Accessibility Tree into linearized audio speech or refreshable Braille output.

By parsing your raw HTML through a client-side DOM parser and computing accessible names according to W3C standards, this tool exposes the exact order in which elements are spoken. It empowers developers, QA testers, and accessibility auditors to rapidly catch missing alt text, unlabelled icon buttons, broken form labels, and disjointed reading orders before code reaches production.

Mapping

Semantic HTML to Speech Announcements

HTML5 Element	Implicit ARIA Role	Sample Synthesized Announcement
<header>	banner	'Banner landmark'
<nav>	navigation	'Navigation landmark, Main menu'
<main>	main	'Main landmark'
<h1>Hello</h1>	heading (level 1)	'Heading level 1, Hello'
<button>Save</button>	button	'Save, button'
<a href='...'>Docs</a>	link	'Docs, link'
<input type='text'>	textbox	'Search query, edit text'
<img alt='Company logo'>	img	'Company logo, graphic'
<img alt=''>	none / presentation	[Skipped silently / decorative]
<aside>	complementary	'Complementary landmark'
<footer>	contentinfo	'Content information landmark'

Capabilities

Key Features & Inspection Tools

Linearized Reading Sequence

Displays the precise chronological order in which assistive tech navigates and speaks your markup.

Accessible Name Calculation

Applies W3C precedence rules for aria-labelledby, aria-label, alt text, and element content.

Built-In Web Speech Synthesis

Listen to realistic audio speech synthesized in real time via the browser's native window.speechSynthesis.

Interactive Audio Controls

Play, pause, resume, and stop spoken announcements with synchronized visual highlighting.

ARIA Landmark Detection

Validates structural page regions (<main>, <nav>, <header>, <aside>, <footer>) for keyboard navigation.

Copyable Speech Transcript

Export clean text transcripts of spoken items for documentation, bug tracking, and compliance audits.

One-Click Component Presets

Load realistic sample templates for navigation bars, checkout forms, dialogs, and cards.

100% Client-Side Sandbox

Runs in an isolated in-memory DOM parser without executing external scripts or leaking code.

Specification

How W3C Accessible Name Computation Works

Every interactive element must convey an accessible name so screen reader users understand what it does. The W3C specification determines accessible names using a strict hierarchy:

aria-labelledby: Checks for IDs of other elements providing the label. Highest priority.
aria-label: Reads the direct label attribute explicitly supplied on the element.
Native Host Markup: Inspects associated <label for="id">, image alt attributes, or direct inner text content (for buttons and links).
Fallback Attributes: Reads placeholder or title attributes if no higher-priority label exists.

If an interactive element (such as <button><svg>...</svg></button>) has no text, no aria-label, and no aria-labelledby, its computed name is empty, creating an accessibility failure.

Workflow

How to Audit Components for Accessibility

Paste target HTML: Copy the HTML markup of your component, form, or article into the input editor.
Inspect reading sequence: Check the parsed cards to ensure the order of announcements makes logical sense.
Audit buttons and links: Verify that every link and button displays a meaningful computed name.
Listen with speech synthesis: Click Read Aloud to hear how the text flows phonetically.
Fix issues in source code: Add missing alt tags, correct heading levels, or addaria-label where necessary.

Applications

Common Accessibility Testing Scenarios

Icon-Only Buttons & Toolbars

Audit search, menu, close (X), and social media icon buttons to ensure they have descriptive aria-label values.

Complex Checkout & Signup Forms

Ensure form inputs, dropdowns, and checkboxes are properly tied to their descriptive text labels via <label for>.

Navigation & Header Menus

Verify that top-level navigation, breadcrumbs, and footer links are organized within distinct landmark containers.

Card Grids & Teaser Modules

Confirm that 'Read More' links include contextual accessible names so users know which article they will open.

Advantages

Benefits of This Simulator

Instant feedback during component development without installing desktop software.
Simulates both visual linearized order and real auditory speech synthesis.
Exposes hidden accessibility defects (empty names, missing alt text) immediately.
Educates developers and design teams on how non-sighted users experience the web.
100% private: internal UI prototypes and confidential mockups are never uploaded.

Boundaries

Limitations vs Real Screen Readers

Does not emulate screen reader virtual cursor navigation keystrokes (H, B, F, T).
Cannot test live focus traps in interactive JavaScript modals or live regions (aria-live).
Browser Web Speech voices sound slightly different than specialized JAWS or NVDA synthesizers.
Formal compliance audits still require manual verification with real assistive devices.

Guidance

Pro Tips for WCAG Compliance

Use native HTML5 semantic elements (<button>, <a>) instead of clickable <div> tags.
Always maintain a strict sequential heading order (H1 > H2 > H3).
Give distinct aria-label values when multiple <nav> landmarks exist on the same page.
Ensure decorative graphics have alt="" so they are ignored cleanly.

Avoid

Common Accessibility Pitfalls

Writing repetitive link text like "click here" or "read more" without context.
Using tabindex greater than 0, which disrupts natural tab order.
Overusing ARIA roles when native semantic HTML elements already exist ("First rule of ARIA").
Relying exclusively on color changes to convey status or validation errors.

Questions

Frequently Asked Questions

What is a screen reader simulator?

A screen reader simulator models how assistive software (such as NVDA, JAWS, or VoiceOver) traverses a web page's underlying Accessibility Tree, announcing headings, landmarks, interactive buttons, form controls, and accessible names in linearized reading order.

Does this simulator replace testing with real screen readers?

No. This simulator is a lightweight development aid designed to catch structural flaws, missing alt attributes, and broken accessible names during coding. Formal accessibility (WCAG) compliance audits must always be verified with genuine screen readers (such as NVDA on Windows or VoiceOver on macOS/iOS).

How does the simulated speech output work?

The tool integrates with your web browser's native Web Speech API (window.speechSynthesis). It processes the linearized accessibility tokens sequentially and reads them aloud using your system's built-in text-to-speech voice engine.

How are accessible names computed by this tool?

The tool uses a heuristic implementation of the W3C Accessible Name and Description Computation 1.1 specification. It prioritizes aria-labelledby, then aria-label, alt text on images, native label elements for form inputs, button text content, and title attributes.

What are ARIA landmark roles and why are they important?

ARIA landmarks (such as banner, navigation, main, complementary, and contentinfo) correspond to semantic HTML5 tags (<header>, <nav>, <main>, <aside>, <footer>). Screen reader users rely on landmarks to bypass repetitive headers and jump directly to primary page content.

Is my HTML markup uploaded to an external server?

No. All DOM parsing and analysis execute strictly in memory inside an isolated browser DOMParser sandbox. No HTML snippets, client data, or proprietary code are ever transmitted across the network.

Why is heading hierarchy (H1 through H6) so crucial for screen readers?

Screen reader users frequently press hotkeys (like the 'H' key in NVDA or JAWS) to skim page sections by heading level. Skipping levels (e.g. jumping directly from H1 to H4) creates confusion about document structure and violates WCAG 2.2 Guideline 1.3.1.

How should decorative images be coded for screen readers?

Decorative images that convey no informational content should have an empty alt attribute (alt='') or aria-hidden='true'. This explicitly instructs screen readers to skip the image rather than announcing the raw filename.

What causes 'unlabeled button' announcements in screen readers?

Icon-only buttons (such as a search magnifying glass or hamburger menu icon without inner text) lack an accessible name if they don't include an aria-label, aria-labelledby, or visually hidden text span, causing screen readers to announce them as an uninformative 'button'.

Can I test interactive elements like form inputs and selects?

Yes. The simulator extracts input types, placeholders, explicit label associations (<label for='id'>), aria-describedby hints, and required attributes to show how assistive tools announce forms.

Can I copy the speech transcript?

Yes. Click 'Copy Transcript' to place the complete linearized announcement script onto your clipboard for documentation or accessibility bug reports.

Does this tool work completely offline?

Yes. As an installable Progressive Web App utility, the simulator functions entirely offline without any active internet connection.

What is the difference between visual order and DOM order?

CSS flexbox, grid, and absolute positioning can rearrange elements visually on screen while leaving their underlying DOM source code unchanged. Screen readers follow DOM order, which can cause severe disconnects if visual layout disagrees with tab order.

Is the Screen Reader Simulator free to use?

Yes. It is completely free with no registration, no usage limits, and no advertising.

More Tools

Related Developer & Text Utilities

Terms

Web Accessibility Glossary

Accessibility Tree

A specialized browser object model mirroring the DOM, consumed by assistive technologies.

WCAG 2.2

Web Content Accessibility Guidelines, the international standard for web accessibility.

ARIA

Accessible Rich Internet Applications, a W3C specification adding semantics to web elements.

Accessible Name

The programmatic label that identifies an element to assistive technology.

Landmark

A major structural area of a web page allowing rapid keyboard navigation.

NVDA

NonVisual Desktop Access, a popular free open-source screen reader for Windows.

VoiceOver

The built-in screen reader software included across Apple macOS and iOS devices.

JAWS

Job Access With Speech, a prominent commercial screen reader for Microsoft Windows.

Linearized Order

The single sequential stream in which content is read aloud by screen readers.

Web Speech API

W3C browser interface providing speech synthesis (text-to-speech) capabilities.

aria-label

Attribute defining a direct string label for an interactive element.

aria-labelledby

Attribute referencing IDs of other elements to construct an accessible name.

Sources

Official Standards & Specifications

Transparency & Verification

Educational Disclaimer

100% In-Browser Execution

This Screen Reader Simulator models linearized reading order and accessible names using client-side heuristics and the browser Web Speech API. It is an engineering development tool and does not substitute for formal accessibility compliance testing with native assistive devices (such as NVDA, JAWS, or VoiceOver) or evaluation by users with disabilities.

Calculations and transformations execute locally on your machine with full offline support. Always verify critical results.

View full legal disclaimer