AI Alt-Text
Generate accessibility-grade alt text: subject-first, concise, no opinion words. Auto-embeddable into PNG / JPEG / WebP metadata.
| Mode | Speed | Quality | Best for |
|---|---|---|---|
| AI alt text | ~1s typical | Accessibility-ready caption | WCAG alt attributes, CMS uploads |
AI Alt-Text needs the lite AI tier (0.1 GB model). You’re currently opted into none.
Quick start
See all 5 presets
Drop images here — add as many as you like
or click to browse · processed one at a time · output text
Tier opt-in required before this capability runs.
Want this capability inside the main editor with layers, history, and the full AI panel?
How it works
- 1
Add your image
Drop or select the image you want to process — it stays on your device.
- 2
Run the model in-browser
AI Alt-Text loads its model (~120 MB) once, caches it, then runs locally in a worker. No upload.
- 3
Download the text
Preview the result and download the text. Re-run with different settings anytime.
Common use cases
Why it’s different
100% Private
Every model runs in your browser. Your files never leave your device — nothing is uploaded to a server.
True Alpha Channel
Exports preserve a real straight-alpha transparency channel (PNG / WebP / AVIF), not a baked-on background.
Free Forever
No account, no watermark, no credits. Open the tool and use it.
Works Offline
After the model downloads once it is cached, so the tool keeps working with no connection.
FAQ
How is this different from Describe?
It is tuned for concise, screen-reader-friendly phrasing rather than a general caption.
Can I edit the output?
Yes — treat it as a strong first draft you can refine.
Is it free to use?
Yes — AI Alt-Text is completely free. No account, no watermark, no credits, and no usage limits.
Do my files or prompts ever leave my device?
No. Everything runs locally in your browser via WebAssembly/WebGPU — there is no server that receives your files, prompts, or results.
Which browser and hardware do I need?
A modern browser. Chrome and Edge get WebGPU acceleration for the fastest results; Firefox and Safari run via WebAssembly. The model (~120 MB) downloads once, then is cached for offline use.
Can I use the results commercially?
Yes. You own everything you create — NSS makes no claim to the images, videos, or text you process or export.
Does it work on mobile?
Lightweight tools run on phones; heavier models prefer a desktop with a GPU. The tool picks the best path for your device and falls back gracefully where needed.
Where can I see a step-by-step guide?
Yes — there is a full walkthrough at /how-it-works/ai-alt-text.
Ready to try AI Alt-Text?
Free, private, no signup — runs right in your browser.