Actionable output
Every result is something you can act on — markup to paste, files to upload, scores to compare.
seo tools
Free Alt Tag Checker
Find images missing alt text in your HTML.
Instant resultsNo sign-up requiredFree to use100% free
Tool Insights
All about the Alt Tag Checker
The Alt Tag Checker scans a page's HTML — live via URL or pasted directly — and lists every image with its alt text so you can spot missing attributes at a glance.
Descriptive alt text improves accessibility for screen-reader users and gives image search context about each photo.
How to use it
- 1Enter a URL or HTML
Fetch a live page by URL, or paste the HTML of the section you want to check.
- 2Review the report
Each image is listed with its status: OK, Empty (decorative) or Missing.
- 3Fix and export
Add alt text where it is missing, then download the CSV if you want to track the work.
What results you get
- A full inventory of images and their alt attributes
- Missing vs. empty vs. present classification
- CSV export for tracking fixes
Why Professionals Trust This Tool
Why professionals trust the Alt Tag Checker
Built and maintained by the W3Tech team that ships production websites and SEO campaigns every week, this tool is held to the same standard we use on our own client work.
Why it's verified
- Powering live campaigns
These tools run in real W3Tech SEO projects, where the numbers feed actual client rankings and link building.
- Informed by practice
The recommendations mirror what our SEO team implements on live sites every week.
- Fresh when you need it
Checks run against live inputs on demand rather than stale, pre-computed databases.
- Built for professionals and beginners
The same data pros use, presented without the gatekeeping.
Features that matter
Bulk where it counts
Run up to 10 URLs or a full sitemap list in a single pass.
No login wall
No accounts, no email capture, no trial countdown.
Genuinely free
No premium tiers holding the useful data hostage.
Tool Speed & Scale
Built for speed, built for scale
Answers in seconds
Most tools return results faster than you can refill a coffee.
Built for bulk work
Competitor lists, sitemaps and URL batches are handled in one go.
Unlimited sessions
Run as many checks as your audit demands — nothing is capped.
Technical & Creative Factors
The thinking behind the Alt Tag Checker
Ranking
Ranking is decided by signals: technical health, content relevance, authority and speed. These tools target every one of them — markup you can validate, crawl files you can submit, authority you can compare and density you can sanity-check.
The sites that outrank consistently are not the ones with a single clever win. They are the ones that stay disciplined across the whole checklist. That is precisely what this suite enforces.
Beat Your Competitors
- 1Map their strengths
Run competitor URLs through the checker and sitemap tools to understand their on-page setup.
- 2Find the gaps
Compare authority, density and structure to spot where they are most beatable.
- 3Execute the fix list
Turn what the tools reveal into a prioritized change plan and ship it faster than they react.
Our Mission
Most professional SEO software costs hundreds of dollars a month — the same money small businesses should be spending on their product. W3Tech built these tools for its own client work and is releasing them free to level the playing field.
Our mission is to give every business access to the same analysis the pros use, without the gatekeeping, sign-ups or premium pricing.
FAQs
Frequently asked questions
Is an empty alt attribute a problem?
Only for decorative images. In that case alt="" is correct because it tells screen readers to skip the image entirely.
What does good alt text look like?
A short, specific description that says what the image shows, including any key text, without keyword stuffing.
Is the Alt Tag Checker really free?
Yes. Every W3Tech tool is 100% free — no trials, no premium tier and no hidden limits. It will stay that way.
Do I need an account or login?
No. Tools run directly on this page with no sign-up, no email capture and no profile to create.
Is my data stored anywhere?
No. Processing happens in your browser and nothing you enter is uploaded or saved to any server.
Does it work on any device?
Yes. As long as you are in a modern browser, the tool works on desktop, tablet and mobile.