What does CLS Checker do?

CLS Checker helps you get a practical SEO result you can verify without inflated claims.

Does CLS Checker store my input?

We do not store inspected page content. Only aggregated usage stats may be kept if logging is enabled.

Are results guaranteed for search engines?

No. These tools help you audit and improve pages, but they do not guarantee rankings or AI answer inclusion.

Yes, all core tools are free for personal and professional use.

Do you store my data?

Browser tools process data locally. Server tools handle requests temporarily; only aggregated stats may be stored.

How do I get started?

Pick a tool from the homepage or search by name, then follow the instructions on the tool page.

How do I change the language?

Use the language toggle at the top of the page to switch editions.

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All “Content Tools” tools

Word & Character Counter Count words and characters locally
Reading Time Calculator Estimate reading time for any text
Arabic Readability Checker Estimate Arabic text readability
Sentence Length Checker Analyze sentence lengths
Paragraph Length Checker Analyze paragraph lengths
Long Sentences Finder Find sentences longer than a limit
Duplicate Paragraphs Finder Detect duplicated paragraphs
Text Similarity Checker Compare two texts for similarity
Remove Duplicate Words Remove consecutive duplicate words
Trim Extra Spaces Clean extra spaces and blank lines
Remove Arabic Diacritics Strip Arabic diacritics safely
Arabic/English Number Converter Convert Arabic and Western digits
Text to Slug Converter Convert any text into a URL slug
Arabic Slug Generator Generate slugs that keep Arabic letters
English Slug Generator Generate clean English URL slugs
Article Length Checker Evaluate article length by words/chars
Text to HTML Ratio Calculate text-to-HTML ratio
Headings Extractor Extract H1–H6 headings from text/HTML
H2/H3 Outline Splitter Suggest an H2/H3 outline
FAQ From Text Generator Suggest FAQs from article text
Content Outline Generator Generate a structured content outline
Article Title Generator Suggest article titles from a topic
Article Intro Generator Generate intros via optional AI provider
Article Conclusion Generator Generate conclusions via optional AI
Content Ideas Generator Suggest content ideas via optional AI
Paragraph Reorder Tool Manually reorder paragraphs
Text to Formatted HTML Convert plain text to safe HTML
HTML Cleaner Strip unwanted tags and attributes
Banned Words Checker Scan text against a word list
Duplicate Headings Checker Detect duplicated headings

All “Keyword Tools” tools

Keyword Research Tool Local keyword ideas from a seed with coverage…
TF*IDF Tool Extract top terms with TF*IDF scoring in the…
Keyword Checker Check keyword presence in title, description, H1, and…
Ranking Checker Estimate keyword difficulty and ranking opportunity (no fake…
Keyword Density Checker Measure keyword density in text
Top Words Extractor Extract the most frequent words
Bigram Extractor Extract two-word phrases
Trigram Extractor Extract three-word phrases
Keyword Density Compare Compare density of two keywords
Keyword Distribution Checker Show keyword positions in text
First Paragraph Keyword Check Check keyword presence in first paragraph
Keyword in Headings Checker Check keyword usage in headings

All “Meta Tools” tools

SERP Snippet Generator Search snippet preview with title and description quality…
Short Description Generator Create short content descriptions
SEO Title Generator Generate SEO title suggestions
Title Length Checker Check approximate title pixel length
Meta Description Generator Create a suitable meta description
Meta Description Length Checker Check meta description length
Full Meta Tags Generator Generate a full meta tags snippet
Extract Meta From HTML Extract meta tags from HTML
Title Presence Checker Check if a page has a title tag
Meta Description Presence Check if a page has a meta description
Title & Description Duplicate Check Compare title/description duplication
Google Mobile SERP Preview Approximate mobile SERP preview
Google Desktop SERP Preview Approximate desktop SERP preview
Arabic SERP Title Preview Preview Arabic title rendering
SERP Breadcrumb Preview Preview breadcrumb in SERP
Canonical Tag Generator Generate a canonical link tag
Canonical URL Checker Inspect a page canonical URL
Self-Referencing Canonical Checker Check self-referencing canonical
Robots Meta Tag Generator Generate robots meta tags
Noindex & Nofollow Checker Check noindex/nofollow directives
Hreflang Generator Generate hreflang tags
Hreflang Checker Audit page hreflang tags
Alternate Mobile URL Generator Generate mobile alternate link tags
Pagination Tags Generator Generate rel prev/next tags
Compare Two Titles Compare length and wording of titles
Compare Two Descriptions Compare two meta descriptions
Title vs H1 Match Checker Compare page title with H1

All “Schema Tools” tools

Article Schema Generator Generate Article JSON-LD following Schema.org
NewsArticle Schema Generator Generate NewsArticle JSON-LD following Schema.org
BlogPosting Schema Generator Generate BlogPosting JSON-LD following Schema.org
SoftwareApplication Schema Generator Generate SoftwareApplication JSON-LD following Schema.org
MobileApplication Schema Generator Generate MobileApplication JSON-LD following Schema.org
VideoGame Schema Generator Generate VideoGame JSON-LD following Schema.org
Product Schema Generator Generate Product JSON-LD following Schema.org
Review Schema Generator Generate Review JSON-LD following Schema.org
AggregateRating Schema Generator Generate AggregateRating JSON-LD following Schema.org
FAQPage Schema Generator Generate FAQPage JSON-LD following Schema.org
HowTo Schema Generator Generate HowTo JSON-LD following Schema.org
BreadcrumbList Schema Generator Generate BreadcrumbList JSON-LD following Schema.org
Organization Schema Generator Generate Organization JSON-LD following Schema.org
WebSite Schema Generator Generate WebSite JSON-LD following Schema.org
WebPage Schema Generator Generate WebPage JSON-LD following Schema.org
ProfilePage Schema Generator Generate ProfilePage JSON-LD following Schema.org
Person Schema Generator Generate Person JSON-LD following Schema.org
LocalBusiness Schema Generator Generate LocalBusiness JSON-LD following Schema.org
Store Schema Generator Generate Store JSON-LD following Schema.org
Restaurant Schema Generator Generate Restaurant JSON-LD following Schema.org
Service Schema Generator Generate Service JSON-LD following Schema.org
Event Schema Generator Generate Event JSON-LD following Schema.org
Course Schema Generator Generate Course JSON-LD following Schema.org
JobPosting Schema Generator Generate JobPosting JSON-LD following Schema.org
VideoObject Schema Generator Generate VideoObject JSON-LD following Schema.org
ImageObject Schema Generator Generate ImageObject JSON-LD following Schema.org
SearchAction Schema Generator Generate SearchAction JSON-LD following Schema.org
SpeakableSpecification Schema Generator Generate SpeakableSpecification JSON-LD following Schema.org
CollectionPage Schema Generator Generate CollectionPage JSON-LD following Schema.org
ItemList Schema Generator Generate ItemList JSON-LD following Schema.org
JSON-LD Validator Validate basic JSON-LD structure
Schema JSON Formatter Pretty-print schema JSON
Schema Extractor From HTML Extract JSON-LD blocks from HTML
Compare Schema Codes Diff two schema snippets
Merge Schema Into Graph Merge entities into one @graph

All “Sitemap Tools” tools

XML Sitemap Generator Convert URL list to XML sitemap
News Sitemap Generator Generate a Google News sitemap
Image Sitemap Generator Generate an image sitemap
Video Sitemap Generator Generate a video sitemap
Sitemap Index Generator Generate a sitemap index file
Sitemap Checker Validate and inspect a sitemap
Extract URLs From Sitemap Extract URLs from a sitemap
Split Large Sitemap Split a large sitemap into chunks
Merge Sitemaps Merge multiple sitemaps
URLs to Sitemap Convert a URL list to XML sitemap
Sitemap to URL List Convert sitemap XML to a URL list
Lastmod Dates Checker Audit lastmod dates in a sitemap
Duplicate Sitemap URLs Finder Find duplicate URLs in a sitemap
Sitemap 404 Finder Sample sitemap URLs for 404 responses
Sitemap vs Site Compare Compare sitemap URLs with crawled links
URL In Sitemap Checker Check if a URL exists in a sitemap

All “Robots Tools” tools

Robots.txt Generator Generate a robots.txt file
Robots.txt Checker Fetch and audit a robots.txt file
Robots URL Tester Test a path against robots rules
Bot Block Rules Generator Generate disallow rules for bots
AI Bots Rules Generator Generate rules for common AI bots
llms.txt Generator Generate an llms.txt file
llms.txt Checker Check availability of llms.txt
llms-full.txt Generator Generate an extended llms-full.txt
Robots/Sitemap/llms Access Check Check access to robots, sitemap, llms

All “Technical SEO” tools

SEO Checker On-page score with meta, structure, quality, and link…
SEO Compare Compare on-page scores for two URLs side by…
Redirect Checker Trace redirect chains with status codes and timing
Page Indexability Checker Audit page indexability signals
Noindex Checker Detect noindex on a page
Robots vs Noindex Conflict Detect crawl vs index conflicts
Server Status Checker Check server response for a URL
HTTP Status Checker Show HTTP status code
HTTP Headers Checker Inspect response headers
Redirect Chain Checker Trace redirect chains safely
Redirect Codes Checker Classify redirect status codes
Redirect Loop Detector Detect redirect loops
HTTPS Checker Verify HTTPS availability
SSL Certificate Checker Inspect SSL certificate details
SSL Expiry Checker Show SSL certificate expiry
Mixed Content Checker Find HTTP assets on HTTPS pages
HTTP/2 Checker Check HTTP/2 support when possible
HTTP/3 Checker Check HTTP/3 or report unavailable
GZIP Checker Check GZIP compression
Brotli Checker Check Brotli compression
Cache-Control Checker Inspect Cache-Control header
Expires Header Checker Inspect Expires header
ETag Checker Inspect ETag header
HSTS Checker Inspect Strict-Transport-Security
Content-Type Checker Inspect Content-Type header
Content-Length Checker Inspect Content-Length header
X-Robots-Tag Checker Inspect X-Robots-Tag header
CORS Checker Inspect CORS headers
CSP Checker Inspect Content-Security-Policy
Security Headers Checker Review key security headers
DNS Checker Show basic DNS records
Nameservers Checker Show domain nameservers
A Record Checker Lookup A records
AAAA Record Checker Lookup AAAA records
CNAME Record Checker Lookup CNAME records
TXT Record Checker Lookup TXT records
DNS Response Time Checker Estimate DNS lookup time
CDN Checker Detect CDN signals
Cloudflare Checker Detect Cloudflare signals
Server IP Checker Show public server IP
Server Location Checker Estimate server location via optional API
Uptime Checker Check if a site is reachable now
Page Size Checker Estimate HTML page size
Page Requests Checker Estimate resource requests from HTML
Code to Text Ratio Calculate code-to-text ratio
Noscript Checker Inspect noscript fallback content
Page Without JavaScript View Show raw text without executing JS
Mobile Friendly Signals Check basic mobile-friendly signals
Viewport Checker Inspect viewport meta tag
Language & RTL Checker Inspect lang and dir attributes
HTML Lang Checker Inspect HTML lang attribute
UTF-8 Encoding Checker Check UTF-8 encoding signals
Soft 404 Checker Look for soft 404 indicators

All “DNS Tools” tools

DNS Lookup Show public DNS records for a domain (A/AAAA/MX/NS/TXT…
Reverse IP Lookup Look up the PTR hostname linked to an…
NS Lookup Show nameserver (NS) records for a domain
MX Lookup Show mail exchange (MX) servers and priority
Domain DNS Health Checker Quick health score for A/NS/MX/SPF/DMARC

All “IP Tools” tools

What is My IP Address Show the IP address as seen by the…
IP Location Lookup Country, city, and ISP for an IP address
Trace Email (Header Analyzer) Parse an email header and extract the path…
IP Blacklist & Email Blacklist Check Basic DNSBL check for public IP addresses
IP WHOIS Lookup Public RDAP data for an IP block
Domain to IP Lookup Resolve IP addresses linked to a domain

All “Developer Tools” tools

HTTP Headers Check Show response headers for a public URL
Check Website Operating System Guess server OS/stack from public headers
MD5 & Base64 Generator Convert text to MD5 and Base64 locally in…
SMTP Test Check MX and probe port 25 on the…
Binary Translator Convert between text and binary
JSON Viewer, Beautifier & Minifier Validate, beautify, or minify JSON

All “Designer Tools” tools

RGB to Colortone Convert RGB to HEX/HSV/CMYK with a tone description
HEX to Colortone Convert HEX to RGB/HSV/CMYK with a tone description
CMYK to Colortone Convert CMYK to RGB/HEX with a tone description
HSV to Colortone Convert HSV to RGB/HEX with a tone description

All “Network Tools” tools

Port Checker Check whether a common port is open on…
MAC Address Lookup Identify vendor from OUI prefix (local sample)
MAC Address Generator Generate a locally administered MAC for testing
ASN WHOIS Lookup Show ASN and prefix via Team Cymru DNS

All “Link Tools” tools

Backlink Checker Page link snapshot (internal/external/nofollow) with clear indicators
Links in Text Checker Extract links from text or HTML
Extract All Links Extract All Links
Extract Internal Links Extract Internal Links
Extract External Links Extract External Links
Broken Links Checker Broken Links Checker
Single Link Checker Single Link Checker
Bulk Links Checker Bulk Links Checker
Download Link Status Download Link Status
Nofollow Links Checker Nofollow Links Checker
Sponsored Links Checker Sponsored Links Checker
UGC Links Checker UGC Links Checker
Anchor Text Analyzer Anchor Text Analyzer
Empty Anchor Finder Empty Anchor Finder
Duplicate Links Finder Duplicate Links Finder
Count Internal Links Count Internal Links
Count External Links Count External Links
HTTP Links Finder HTTP Links Finder
Redirect Links Finder Redirect Links Finder
Short Links Checker Short Links Checker
Expand Short URL Expand Short URL
UTM Generator UTM Generator
UTM Analyzer UTM Analyzer
URL Encoder URL Encoder
URL Decoder URL Decoder
URL to HTML Link URL to HTML Link
Clean Tracking Params Clean Tracking Params
Extract Domain From URL Extract Domain From URL
Extract Slug From URL Extract Slug From URL
Compare Two URLs Compare Two URLs
Relative vs Absolute Links Relative vs Absolute Links
Internal Link Suggestions Internal Link Suggestions