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NVDA (NonVisual Desktop Access)

What does NVDA mean?

NVDA (NonVisual Desktop Access) is a free, open-source screen reader designed for Microsoft Windows. Developed by the non-profit organization NV Access, NVDA enables individuals who are blind or visually impaired to access and interact with digital content through synthesized speech and Braille output. Its commitment to accessibility and affordability has made it a widely adopted tool globally.

How does NVDA work?

NVDA operates by utilizing accessibility APIs such as UI Automation, Microsoft Active Accessibility (MSAA), IAccessible2, and Java Access Bridge to retrieve information from applications and the operating system. It then conveys this information to users via:

  • Text-to-speech output: Converts on-screen text into spoken words using built-in synthesizers like eSpeak NG or compatible third-party synthesizers.
  • Braille display support: Interfaces with various refreshable Braille displays, providing tactile feedback for users who are deaf-blind.
  • Keyboard navigation: Allows users to navigate applications and web content using keyboard shortcuts, enhancing efficiency and accessibility.

NVDA supports a wide range of applications, including web browsers (e.g., Firefox, Chrome), email clients, and office suites like Microsoft Office and LibreOffice.

It plays a crucial role in promoting digital inclusion by providing a cost-free solution for screen reading. Its significance includes:

  • Affordability: Being free and open-source, NVDA removes financial barriers, especially in low-income regions.
  • Portability: Users can run NVDA from a USB drive without installation, facilitating access on public or shared computers.
  • Community-Driven Development: Continuous improvements and updates are driven by a global community of contributors.
  • Compliance with accessibility standards: Supports WAI-ARIA for web accessibility, aiding developers in creating inclusive web application

FAQs about NVDA

NVDA is compatible with Windows 8.1 and later versions. Older versions of NVDA are available for Windows 7 and earlier, but they may lack support and updates.

No, NVDA is specifically designed for the Microsoft Windows operating system and does not support macOS or Linux.

Yes, NVDA supports over 60 languages, making it accessible to a diverse user base worldwide.

Yes, NV Access provides user guides and training materials on their website to help users learn how to effectively use NVDA.

Yes, NVDA is commonly used by developers and QA testers to evaluate how accessible their websites and applications are for screen reader users. It helps identify navigation issues, missing alt text, incorrect ARIA attributes, and more.