IMAGE & SEO AUDITOR

HTML Image Extractor & Alt Auditor

Extract all embedded image tags, source URLs, responsive source sets, and dimensions. Audit accessibility and identify missing or empty alt text attributes for SEO.

100% Private · Processed locally in your browser

Preview	Source URL (src)	Alt Text	Dimensions	Status
Extracted images will appear here...

◆ ABOUT THIS TOOL

About HTML Image Extraction & Alt Auditing

Audit visual assets, identify missing alternative descriptions, and boost SEO rankings.

Images are essential for engaging web pages, but missing alternative text (alt) damages search engine rankings, impairs Core Web Vitals, and excludes visually impaired users relying on screen readers. Finding every unlabelled image across extensive markup manually is time-consuming.

The Developers Web Tools HTML Image Extractor parses all <img> tags and <picture> elements, pulls primary image URLs from standard src, srcset, and lazy-loading data-src attributes, audits accessibility compliance, and exports a comprehensive spreadsheet without sending data over a network.

⚙ AUDIT & ACCESSIBILITY

Image Audit & Extraction Rules

How image nodes, source attributes, and accessibility attributes are evaluated.

🖼

Lazy-Loading & Srcset Detection

Detects standard src attributes as well as modern lazy-loading patterns (data-src, data-lazy, srcset), picking the optimal base image URL automatically.

♿

WCAG Accessibility & Alt Tag Audit

Differentiates between valid descriptive alt text, empty alt="" placeholders, and completely missing alt attributes, calculating overall alt coverage percentage.

🔗

Relative Asset Resolution

Transforms local asset paths (e.g. /images/hero.png) into full absolute URLs when an optional domain Base URL is specified.

◐ THREE STEPS

How to Use

Audit and extract all image tags in under ten seconds.

Paste HTML Code

Paste your HTML markup or page templates into the left editor, or click "Load Example" to test the tool.

Set Base URL & Extract

Optionally specify a domain base URL to resolve asset paths, then click the amber "Extract Images" button.

Audit, Copy or Export

Filter by missing alt tags, copy image URLs to clipboard, or export the full audit table as an Excel-ready CSV.

✓ FEATURES

Why Use the HTML Image Extractor on Developers Web Tools

Engineered for fast, reliable, and clean visual asset audits.

◆

100% Private

All DOM parsing occurs in your browser's local sandbox. No HTML or proprietary image assets leave your device.

👁

Visual Previews

Renders thumbnail previews for valid remote and absolute URLs directly in the extracted results table.

⚡

Instant Filter Toggles

Switch between Missing Alt and Valid Alt views dynamically without needing to re-extract or re-paste input.

📊

SEO Alt Coverage Metric

Calculates percentage scores for accessible images, helping verify on-page technical SEO compliance.

↓

Export to CSV

Export all extracted image metadata and alt texts directly into an Excel-ready CSV spreadsheet.

⧉

Fast Clipboard Copy

Copy clean plain text image source URLs matching your active filter with one click.

FAQ

Frequently Asked Questions

Alt text provides a text alternative for search engines crawling your images and enables visually impaired users with screen readers to understand the content and context of visual assets.

Yes. The extraction engine scans standard <img> tags as well as <picture source> elements, capturing candidate image URLs accurately.

If your HTML uses relative paths (such as /assets/hero.jpg or ../images/logo.png), entering a Base URL converts them into full, clickable URLs for visual thumbnail previews.

No. All parsing and extraction execute 100% locally in your browser through client-side JavaScript. Your code and assets remain private.

Yes! Clicking "Download CSV" generates an Excel-compatible spreadsheet listing each image URL, alt text, dimensions, and compliance status.