Free SEO Tools Online
Practical SEO utilities: title and meta tag analyzers with live SERP previews, keyword density and suggestion tools, sitemap and robots.txt generators, readability scoring.
7 free tools — browser-based, no sign-up required.
Meta Tag Generator
Generate SEO meta tags for your website
Robots.txt Generator
Generate robots.txt files
Sitemap Generator
Generate XML sitemaps for websites
SEO Title Analyzer
Analyze and optimize page titles for SEO
Keyword Density Tool
Analyze keyword density in text
Alt Text Generator
NEWGenerate alt text for images using AI
Keyword Suggestion Tool
Get keyword suggestions for your content
About FlexyPdf SEO Tools
Search engine optimization in 2026 is mostly about doing the basics correctly — clear titles, accurate meta descriptions, readable content, a valid sitemap — and avoiding the small mistakes that drag a page down. The SEO tools here focus on those basics rather than trying to be all-in-one platforms. They are quick to use for a single page check, free, and they do not require you to sign up or share your domain.
The SEO title analyzer renders a live Google SERP preview as you type, scoring your title on length (in pixels, not just characters, because Google truncates by pixel width), keyword placement, power-word density, and emotional resonance. It flags titles that will get cut off in the search results. The meta tag generator produces complete OG and Twitter Card metadata in one block, including the right dimensions for OG images that platforms actually accept.
The keyword density tool surfaces over-optimized keyword stuffing and missing semantic terms in one view, with separate counts for 1-word, 2-word, and 3-word phrases. The readability checker reports Flesch-Kincaid, Flesch Reading Ease, Gunning Fog, and Coleman-Liau scores along with average sentence length and syllable counts — useful for matching your writing to the reading level of your target audience. The sitemap and robots.txt generators produce valid output that you can paste straight into your site root.
Who uses these tools
A few of the recurring use cases we hear about from FlexyPdf visitors.
Content marketers and writers
Drafting and scoring page titles before publishing, checking that an article is not over-optimized for its target keyword, hitting a target readability grade level.
Small business owners and freelancers
Generating a sitemap and robots.txt for a new site, writing meta descriptions for landing pages, validating Open Graph tags before sharing on social media.
SEO consultants and agencies
Running quick audits across a client's pages, generating standardized meta tags for batch content imports.
Bloggers and publishers
Keeping article titles within Google's display limit, ensuring each post has unique well-formed metadata.
Frequently asked questions
Does the SERP preview match what Google actually shows?
It uses Google's current display widths and truncation rules, refreshed regularly. Note that Google sometimes rewrites titles algorithmically — the preview shows what you submit, not necessarily what will be displayed.
How accurate are the readability scores?
The standard formulas (Flesch-Kincaid, Gunning Fog, Coleman-Liau) are well-defined and the implementation here matches the canonical formulas. Use the scores as a relative guide rather than an absolute truth — a Flesch-Kincaid grade of 8 means roughly an 8th-grade reading level.
Will the sitemap generator crawl my whole site?
No. The sitemap generator builds a sitemap from a list of URLs you provide or paste in. For a full automated crawl, a dedicated SEO platform with a hosted crawler is a better fit.