Free SEO tools that run in your browser
Preview snippets, test robots.txt rules, audit heading structure and measure readability — without uploading anything to a server.
Why “client-side” matters here
You are about to paste unpublished page copy, a staging robots.txt, or HTML from a site you are not ready to talk about. Every tool on this site processes that input as plain JavaScript on your own machine. Nothing is uploaded, nothing is logged, and there is no request attached to the text you type.
All tools
Meta Tag Generator
Generate clean page title, meta description, canonical, Open Graph and Twitter card tags.
SERP Preview Tool
Preview how your title and description will look in Google search results, measured in real pixels.
robots.txt Tester
Paste a robots.
Heading Structure Analyzer
Paste HTML and get a clean H1–H6 outline plus a list of real problems: missing or duplicated H1, skipped levels, and headings that are too long.
Keyword Density Checker
Count single words, two-word and three-word phrases with stopwords filtered out.
Readability Score Checker
Measure Flesch Reading Ease, Flesch-Kincaid grade level, sentence length, syllables per word and passive voice.
Guides
Meta Description Length: What Actually Gets Truncated
The number everyone quotes is 155 characters. The real rule is pixel width, and knowing the difference saves you from rewriting descriptions that were fine.
robots.txt Mistakes That Silently Deindex Pages
Five configuration errors that remove pages from Google without producing any error message anywhere.
Heading Structure: What H1–H6 Order Actually Does
Headings are document structure, not a ranking lever. Here is what they genuinely affect, and what is folklore.