Free SEO & AI Tools
A complete toolkit for content, keywords, technical SEO, and reporting — instant, free, and built on the same AI platform that powers SemlyPro.
Content & Writing
15Content Brief Generator
Comprehensive SEO briefs for writers — intent, outline, questions & competitors.
Open toolBlog Title Generator
20 catchy, SEO-optimized blog title ideas from any keyword.
Open toolContent Calendar Generator
A month of content ideas with target keywords, ready to plan.
Open toolReadability Checker
Flesch reading ease, grade level, and fixes for any text.
Open toolWord Count & Reading Time
Count words, characters & estimate reading time instantly.
Open toolAI Overview Answer Optimizer
Format answers in BLUF style to win AI Overviews & snippets.
Open toolUTM Campaign Builder
Build trackable campaign URLs (UTM).
Open toolText Case Converter
Title, sentence, upper, lower, kebab, snake.
Open toolLorem Ipsum Generator
Placeholder text by paragraphs/words.
Open toolText Diff Checker
Compare two texts and highlight changes.
Open toolDuplicate Content Checker
Similarity % between two texts.
Open toolPassive Voice Checker
Flag passive voice & long sentences.
Open toolCTA Generator
Call-to-action copy ideas.
Open toolSyllable Counter
Count syllables, words & complex words.
Open toolGoogle Ads Character Counter
RSA headlines & descriptions vs limits.
Open toolKeywords & Topics
11Keyword Density Analyzer
Density %, phrase frequency, and over-optimization warnings.
Open toolSemantic Keyword Generator
LSI / semantic keywords and long-tails for your topic.
Open toolPeople Also Ask Generator
People-Also-Ask style questions for any keyword.
Open toolKeyword Grouping Tool
Cluster a keyword list by search intent and theme.
Open toolTopic Cluster Planner
Plan a pillar + cluster content map from a seed topic.
Open toolAnchor Text Generator
Natural, varied anchor text for internal & external links.
Open toolKeyword Combiner
Mix word lists into keyword combinations.
Open toolKeyword Permutation Generator
PPC match-type variants from a keyword list.
Open toolNegative Keyword Generator
Build a negative keyword list for PPC.
Open toolKeyword List Cleaner
Dedupe, lowercase, trim & sort keywords.
Open toolN-Gram Analyzer
Uni/bi/tri-gram frequencies from text.
Open toolSchema & Structured Data
19Article Schema Generator
Article & BlogPosting JSON-LD for rich results.
Open toolProduct Schema Generator
Product, Offer & rating JSON-LD.
Open toolLocal Business Schema Generator
LocalBusiness JSON-LD with address, hours & geo.
Open toolBreadcrumb Schema Generator
BreadcrumbList JSON-LD from your page path.
Open toolOrganization Schema Generator
Organization JSON-LD with logo & socials.
Open toolReview Schema Generator
Review & AggregateRating JSON-LD.
Open toolEvent Schema Generator
Event JSON-LD with dates, venue & tickets.
Open toolRecipe Schema Generator
Recipe JSON-LD with ingredients & steps.
Open toolVideo Schema Generator
VideoObject JSON-LD for video rich results.
Open toolHowTo Schema Generator
HowTo JSON-LD with steps, tools & supplies.
Open toolJob Posting Schema Generator
JobPosting JSON-LD for Google for Jobs.
Open toolCourse Schema Generator
Course JSON-LD for education rich results.
Open toolSoftware App Schema Generator
SoftwareApplication JSON-LD with price & rating.
Open toolSitelinks Searchbox Generator
WebSite + SearchAction JSON-LD for a search box.
Open toolPerson Schema Generator
Person JSON-LD for author / E-E-A-T.
Open toolQAPage Schema Generator
QAPage JSON-LD for Q&A pages.
Open toolService Schema Generator
Service JSON-LD with provider & pricing.
Open toolBook Schema Generator
Book JSON-LD for book rich results.
Open toolPodcast Schema Generator
PodcastEpisode JSON-LD for podcast SEO.
Open toolTechnical SEO & Schema
9FAQ Schema Generator
Generate FAQPage JSON-LD schema from your Q&As.
Open toolOpen Graph & Twitter Card Generator
OG & Twitter Card tags with a live social preview.
Open toolHreflang Tag Generator
Hreflang tags for multi-region & multilingual sites.
Open toolMeta Robots Tag Generator
Meta robots & X-Robots-Tag directives with toggles.
Open toolXML Sitemap Generator
Build a valid sitemap.xml from a list of URLs.
Open toolHeading Structure Analyzer
Audit your H1–H6 heading hierarchy from pasted HTML.
Open toolAlt Text Checker
Find images missing alt text in HTML.
Open toolSecurity Headers Generator
HTTP security headers (CSP, HSTS, etc.).
Open toolCache-Control Header Generator
Build a Cache-Control header value.
Open toolMeta & Head Tags
7Canonical Tag Generator
Canonical & alternate link tags.
Open toolRobots.txt Generator
Build a robots.txt with rules & sitemap.
Open toolLLMs.txt Generator
Generate an llms.txt to guide AI crawlers.
Open toolResource Hints Generator
preconnect / dns-prefetch / preload tags.
Open toolFavicon Tags Generator
Favicon, apple-touch & manifest tags.
Open toolMeta Description Checker
Check meta description length & SERP preview.
Open toolViewport Meta Generator
Responsive viewport & theme-color tags.
Open toolSocial & Local
5YouTube Tag Generator
Relevant YouTube video tags from a topic.
Open toolHashtag Generator
Relevant hashtags by topic & platform.
Open toolSocial Media Character Counter
Count text against every platform limit.
Open toolSocial Media Image Size Guide
Recommended image sizes for every platform.
Open toolNAP Consistency Checker
Check Name/Address/Phone consistency.
Open toolLink & URL Tools
6URL Encoder / Decoder
Encode or decode URLs & query strings.
Open toolLink Extractor
Extract all links from pasted HTML.
Open toolRedirect Rule Generator
301 rules for Apache, Nginx & Next.js.
Open toolNofollow Link Checker
List links and their rel from HTML.
Open toolURL Parameter Cleaner
Strip tracking params from URLs.
Open toolQuery String Parser
Parse a URL into a parameter table.
Open toolMarketing Calculators
20Organic Traffic Value Calculator
Estimate the $ value of organic traffic.
Open toolConversion Rate Calculator
Conversion rate + benchmark.
Open toolA/B Test Significance Calculator
Is your A/B test statistically significant?
Open toolContent Marketing ROI Calculator
ROI of your content program.
Open toolPPC ROI Calculator
Google Ads / PPC ROI, ROAS & CPA.
Open toolROAS Calculator
ROAS and break-even ROAS.
Open toolCustomer LTV Calculator
Customer lifetime value.
Open toolCAC Calculator
Acquisition cost & LTV:CAC ratio.
Open toolChurn Rate Calculator
Churn & retention rate.
Open toolEmail Marketing ROI Calculator
ROI of an email campaign.
Open toolLead Value Calculator
The monetary value of a lead.
Open toolMarketing Budget Allocator
Split a budget across channels.
Open toolA/B Test Sample Size Calculator
Sample size needed for an A/B test.
Open toolCPM / CPC / CPA Calculator
Convert between ad cost metrics.
Open toolProfit Margin Calculator
Gross profit, margin % and markup %.
Open toolBreak-Even Calculator
Break-even point in units & revenue.
Open toolMRR & ARR Calculator
SaaS MRR, ARR & projected growth.
Open toolEngagement Rate Calculator
Social media engagement rate.
Open toolPayback Period Calculator
Payback period for an investment / CAC.
Open toolCart Abandonment Calculator
Abandonment rate & recoverable revenue.
Open toolDeveloper Utilities
6Markdown to HTML Converter
Convert Markdown to clean HTML.
Open toolHTML to Markdown Converter
Convert HTML to Markdown.
Open toolJSON Formatter & Validator
Format, validate & minify JSON.
Open toolBase64 Encoder / Decoder
Encode or decode Base64 (unicode-safe).
Open toolColor Contrast Checker
WCAG color contrast ratio checker.
Open toolCSV to JSON Converter
Convert CSV to JSON (and back).
Open toolRankings & ROI
4SEO ROI Calculator
Calculate the ROI, payback period, and revenue of your SEO.
Open toolSEO CTR Calculator
Estimate organic CTR by position and project monthly clicks.
Open toolTitle Pixel-Width Checker
Check title-tag pixel width and Google truncation.
Open toolURL Slug Generator
Turn any title into a clean, SEO-friendly URL slug.
Open tool