Alt-Text Quality Analyzer
Automated scanners pass alt="image.jpg" or alt="photo" — alt
text that tells a screen-reader user nothing. This tool scores the quality of
your alt text and explains exactly how to improve it.
Tool interface
Per-image quality report
Introduction
Alt text is only useful if it conveys the image's purpose. Filenames, generic words, and emoji noise waste a screen-reader user's time. This analyzer turns vague alt text into actionable fixes.
How it works
- Extracts every
<img>and itsalt/src. - Flags missing alt as a WCAG 1.1.1 failure.
- Scores present alt text 0–100 with itemized penalties.
- Offers a concrete suggestion for each penalty.
Privacy
All analysis is local via DOMParser and string heuristics. No upload, no account, no API key.
Limitations
- Cannot verify visual accuracy of the description.
- Emoji detection uses Unicode pictographic ranges; rare symbols may be missed.
FAQ
How long should alt text be?
Concise and purposeful — typically under ~125 characters. Longer descriptions belong in a caption or adjacent text.
Is my markup uploaded?
No. Everything runs locally.