Image SEO & Alt Text Auditor
Audit image alt text from HTML for SEO and accessibility. Extract <img> tags, flag missing/empty/too-long/too-short/non-descriptive alt, compute stats, generate CSV and Markdown reports, and list WCAG issues. 100% client-side.
About Image SEO & Alt Text Auditor
Audit image alt text from HTML for SEO and accessibility. Extract <img> tags, flag missing/empty/too-long/too-short/non-descriptive alt, compute stats, generate CSV and Markdown reports, and list WCAG issues. 100% client-side. Everything runs locally in your browser — your data never leaves your device.
How to use
- Enter your input in the tool above.
- Adjust any options to your preference.
- Use the Copy or Download buttons to save the result.
- Everything happens locally — your data never leaves your browser.
FAQ
What does this tool check?
It extracts every <img> tag from your HTML and audits the alt attribute: missing alt, empty alt (decorative), too short (< 4 chars), too long (> 125 chars), and non-descriptive (only generic words like 'image' or 'photo'). It also flags images missing width/height (CLS risk).
Why is alt text important for SEO?
Alt text helps Google understand what images show, which can drive traffic from Google Images and Image Search. It's also used as a ranking signal for regular search (image context helps the page). And alt text is essential for accessibility — screen readers read it aloud to visually impaired users.
What's WCAG 2.1 SC 1.1.1?
Web Content Accessibility Guidelines (WCAG) Success Criterion 1.1.1 (Non-text Content) requires that all non-decorative images have equivalent text alternatives. Decorative images can use empty alt="". Content-bearing images need descriptive alt text. This is a Level A requirement — the minimum legal accessibility standard in many jurisdictions.
What makes alt text 'good'?
Between 4 and 125 characters, descriptive of what the image actually shows (not 'image of a car' — just 'a red sports car on a highway'), and not stuffed with keywords. If the image is purely decorative (a spacer, a border), use alt="" (empty alt) so screen readers skip it.
What extra features does this tool have compared to others?
(1) Image count + per-issue counts. (2) Missing alt count. (3) Empty (decorative) alt count. (4) Good alt count. (5) Alt length stats (min/avg/max). (6) SEO issue list (missing dimensions, non-descriptive, etc.). (7) WCAG 2.1 accessibility issue list. (8) Export report as CSV. (9) Copy report. (10) History (localStorage, last 20) + shareable URL.
Is my data sent anywhere?
No. All HTML parsing and analysis runs locally. History is stored in localStorage on this device only.
Related tools
Anchor Text Distribution Analyzer
Analyze anchor text distribution from backlink data. Categorize anchors as exact/partial match, branded, generic, naked URL, or image. Compute distribution %, warn on over-optimization, and export. 100% client-side.
Backlink Gap Analyzer
Find backlinks your competitors have but you don't. Multi-competitor support (up to 3), gap detection, opportunity scoring, shared backlinks, top opportunities sorted by DA, export CSV, history (localStorage), shareable URL. 100% client-side.
Backlink Profile Analyzer
Analyze imported backlink data (CSV/JSON). Total backlinks, unique domains, anchor distribution, dofollow/nofollow ratio, link-type distribution, top referring domains, top anchor texts, toxic link flagging (low DA), CSV/JSON import, report export, history, shareable URL. 100% client-side.