Free SEO Tools by RankNibbler
RankNibbler offers a complete suite of free SEO tools with no signup, no limits, and no premium tier. Every tool runs in your browser and never stores your data.
Page Analysis Tools
SEO Checker
The main RankNibbler tool. Enter any URL and get a score out of 100 based on 30+ on-page SEO checks. Includes title tags, meta descriptions, headings, images, links, structured data, keyword density, readability, tech stack detection, and more. Download results as PDF or CSV.
Site Audit
Enter a domain and RankNibbler crawls your sitemap to discover every page, then audits up to 200 pages automatically. Get average scores, find your worst pages, and export everything as CSV.
Bulk URL Checker
Paste up to 20 URLs and get SEO scores for all of them at once. Each result has expandable details showing the full audit. Export as CSV.
Comparison Tools
SEO Compare
Compare two pages side by side across every SEO factor. Add a target keyword to see which page is better optimised for that term. Great for competitor analysis.
Link Tools
Broken Link Checker
Scan any page for dead links, 404 errors, and redirect chains. Checks up to 100 links per page with filters for broken only or redirects only. Export as CSV.
Redirect Checker
Enter a domain and check if all four URL variants (HTTP, HTTPS, WWW, non-WWW) redirect correctly to a single canonical URL. Detects chains and temporary redirects.
Content Tools
SERP Snippet Generator
Preview how your page will appear in Google search results. Fetch a live URL or type your own title and description. Shows pixel width so you know exactly where Google will truncate.
Why Free?
RankNibbler was built as a practical tool for web developers, SEO professionals, and website owners who need quick, reliable SEO checks without the overhead of paid subscriptions. The tool runs entirely in your browser — we do not need to store data or manage accounts, which keeps costs minimal.
Last updated: March 2026