Alt Text Auto-Fill

About

OVERVIEW

Alt Text Auto-Fill is a free, Open Source Chrome extension developed by the Software for Progress Foundation to make the internet more inclusive. Using TensorFlow.js and the coco-ssd model, it automatically generates alt text for images, ensuring that people who rely on screen readers can access the same content as everyone else.

This extension reflects our mission: accessibility is not optional — it is a right. By keeping it free, offline, and Open Source, we’re breaking down barriers and giving individuals, educators, and developers the ability to make the web a more welcoming place for all.

100% Offline | 100% Free | 100% Open Source

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WHY ALT TEXT MATTERS

Alt text is more than a technical requirement — it is a matter of dignity and access.

- Equity – Over 285 million people worldwide with visual impairments deserve the same access to information as sighted users.
- Inclusion – Alt text ensures that communities often left behind can participate fully in digital spaces.
- Resilience – Alt text provides context when images don’t load or when connections are slow.
- Progress – A more accessible web is a more just web.

When we add alt text, we’re not just improving compliance — we’re ensuring human connection.

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FEATURES

- AI-Powered – Detects people, animals, and objects in images using TensorFlow.js and coco-ssd.
- Fully Offline – All processing happens in your browser. No accounts. No servers. No surveillance.
- Inclusive by Design – Respects existing alt text, skips decorative images, and avoids overreach.
- Open Source – Transparent, auditable, and built for community contribution.

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HOW IT WORKS

- Detects images missing alt text
- Analyzes image content and surrounding context
- Generates natural descriptions using AI + heuristics
- Applies alt text directly into the page

Example Outputs:
- Photo of a group → “Three people” or “A group of people”
- Photo of a pet → “A dog” or “Two cats”
- Everyday objects → “A laptop and a cup”
- Wide image → “Wide banner image”
- Tall/narrow → “Tall portrait image”
- Small glyphs → “Small icon”
- High-res photos → “Large high-resolution image”

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WHO IT’S FOR

- Screen reader users who deserve equal access to the web
- Developers who want to test and strengthen accessibility in their work
- Educators teaching why inclusion matters in design
- Advocates showing that Open Source solutions can make an immediate difference
- Anyone who believes technology should serve people, not exclude them

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SOFTWARE FOR PROGRESS FOUNDATION

This project was created by the Software for Progress Foundation, a nonprofit (501(c)(3) pending) dedicated to supporting developers who build Open Source software that benefits all people.

We believe:
- Accessibility is a right, not a premium feature
- Open Source is the path to a fairer digital future
- Developers deserve mentorship, resources, and funding to sustain projects that matter

Every accessible image is a step toward a web where technology works for communities, not against them.

🌐 Learn more: https://softwareforprogress.org

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OPEN SOURCE & CONTRIBUTIONS

- License: MIT
- Source: https://github.com/SoftwareforProgress/Alt-Text-Auto-Fill
- Contribute: Join us in shaping this project — whether you’re a developer, designer, or accessibility advocate

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JOIN THE MOVEMENT

By installing Alt Text Auto-Fill, you’re not just improving your browsing experience — you’re helping create a more inclusive internet.

No setup. No accounts. No barriers.
Just Open Source accessibility, powered by community.