Originally published on ProArticlesHub
If you build or write for the web, SEO checks are one of those things you know you should do consistently — but paid tools are expensive, and free ones are usually scattered across ten different sites with ads everywhere.
I put together a single free hub with 10 tools I actually use myself for auditing my own site (proarticleshub.com), and figured it might save other devs/bloggers some time too.
The Tools
Content-level checks:
Word Counter — quick count for content length targets
Keyword Density Checker — avoid keyword stuffing without guessing
SEO Title Length Checker — keeps your
in the 50–60 character sweet spot so Google doesn't truncate it<br>
Meta Description Length Checker — same idea, for the 150–160 character range</p>
<p>Technical/on-page checks:</p>
<p>URL Slug Generator — clean, SEO-friendly slugs from any text<br>
Bulk H1 Tag Checker — scan up to 500 pages at once for missing/duplicate H1s<br>
Bulk Image Alt Text Checker — find images missing alt text across your whole site in one pass<br>
Bulk Image Size & WebP Checker — catches oversized images and non-WebP formats that hurt Core Web Vitals<br>
Broken Link Checker — scans up to 500 URLs and exports a CSV of dead/redirected links<br>
Meta SEO Audit Tool — one-page check of title, description, canonical, robots, Open Graph, and Twitter Card tags together<br>
Why I Built the Bulk Versions</p>
<p>Single-URL checkers are fine for one page, but if you're auditing an existing site with 50–100+ posts, checking one URL at a time is painful. The bulk tools (H1, image alt text, image size, broken links) let you paste a list or point at a sitemap and get a CSV report back — the same workflow I use monthly on my own site to catch things like:</p>
<p>Posts where I forgot to add alt text months ago<br>
Old internal links pointing to posts I've since deleted or renamed<br>
Images that never got converted to WebP<br>
Try It</p>
<p>Everything's free, no signup required: proarticleshub.com/free-online-seo-tools</p>
<p>If you build something similar or have a tool you think should exist, I'd genuinely like to hear about it in the comments — always looking to add useful ones to the list.</p>
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