> spellmistake --seo-tools --free --online

SEO Tools Free Online by SpellMistake

Use 45 SEO tools free online, all in one place. SpellMistake helps writers, bloggers, marketers and website owners check spelling and grammar, test meta titles, find broken links, audit a full website and much more. Every tool is live and ready to use, with no sign up, no download and no paywall.

free tools

All Free Online SEO Tools

Every SpellMistake tool, grouped by task. All tools listed here are live and free to use. Pick a category or scroll the full list.

Technical SEO

Sitemaps, robots.txt, .htaccessView tools 11

Crawl and Site Health

Redirects, status codes, linksView tools 7

On-Page SEO

Meta tags, headings, densityView tools 8

SERP Tools

Previews and positionsView tools 3

SEO Calculators

ROI, keyword value, priorityView tools 3

Links and Authority

DR and backlink pricingView tools 3

Content Tools

Rewrite and countView tools 4

Web Utilities

URLs, page size, screenshotsView tools 6

Technical SEO

11 tools

XML Sitemap GeneratorCrawl a site and build a clean sitemap.xml.Server XML Sitemap ValidatorFind errors in any sitemap.Browser Robots.txt GeneratorPresets, AI bots, URL tester.BrowserPopular Robots.txt ValidatorEvery line checked against Google's rules.Browser .htaccess GeneratorRedirects, HTTPS, www and caching rules.Browser Ads.txt Generatorads.txt and app-ads.txt files.Browser

IndexNow SubmitterSend new pages to Bing and Yandex instantly.Free API

Schema Markup ValidatorCheck JSON-LD and Microdata for rich results.Server

Schema Markup GeneratorFill a form, get clean JSON-LD.Browser

SSL Certificate CheckerIs the SSL valid, trusted and not expiring?Server

Security Headers CheckerA+ to F grade for security headers, with fixes.Server

Crawl and Site Health

7 tools

SEO Audit ToolFull SEO audit for a page or a whole site.ServerNew

Redirect Chain CheckerEvery hop, status code and the fix.ServerPopular HTTP Status CheckerStatus codes for up to 100 URLs.Server Broken Links CheckerFind dead links on any page.Server

Core Web Vitals CheckerReal-user LCP, INP and CLS with a pass or fail.Free API

PageSpeed CheckerLighthouse scores and the top speed fixes.Free API

HTTP Header CheckerResponse headers of any URL, step by step.Server

On-Page SEO

8 tools

Meta Tags AnalyzerEvery meta tag on any URL, with fixes.Server Meta Tags GeneratorTitle, description, Open Graph and X tags.Browser Meta Title CheckerPixel width and keyword checks.Browser Meta Description CheckerMake every description fit and convert.Browser Headings Extractor H1-H6Heading outline of any page.Server Keyword Density AnalyzerTop words and phrases, plus focus keyword use.Server

Hreflang CheckerHreflang codes, return links and x-default.Server

Open Graph CheckerSocial share previews and OG tag checks.Server

SERP Tools

3 tools

SERP SimulatorYour Google result on desktop and mobile.BrowserPopular SERP ComparatorYour page vs. competitors, side by side.Server

Google Entity CheckerIs your brand in Google's Knowledge Graph?Free API

SEO Calculators

3 tools

SEO ROI CalculatorRevenue, ROI and break-even month for SEO.Calculator Keyword Value EstimatorClicks, traffic value and revenue per keyword.Calculator Keyword Opportunity ScoreScore keywords 0 to 100 and find quick wins.Calculator

Links and Authority

3 tools

Domain Rating CheckerDR of one site or up to 100 at once.Free API

Backlink Price CalculatorFair price range for a guest post or link.Calculator

Page Rank CheckerPageRank 0 to 10 and global rank, in bulk.Free API

Content Tools

4 tools

Article RewriterReword text with Light, Medium or Strong.Browser Word CounterWords, reading time, keyword density.Browser

YouTube Tag ExtractorHidden tags and stats of any YouTube video.Free API

Related Keywords FinderRelated words, topics and synonyms for any keyword.Free API

Web Utilities

6 tools

URL Encoder / DecoderEncode, decode and break down URLs.Browser Page Size CheckerTotal page weight and the biggest files.Server Website Screenshot GeneratorFull-page screenshots on desktop and mobile.Free API

Domain Age CheckerDomain age, expiry and registrar (WHOIS).Free API

Wayback History CheckerFirst seen date and website history by year.Free API

DNS LookupAll DNS records, plus SPF and DMARC checks.Free API

Need another tool?Tell us, we build the most requested ones.

> about --spellmistake

Free SEO Tools Online by SpellMistake

SpellMistake is a free toolkit of online SEO tools for content writing, on-page SEO and technical SEO. Each tool does one job well: paste your text or enter a URL, and get a clear result with simple fixes in a few seconds.

What are SEO tools?

SEO tools are apps that check how well a website is set up for search engines. SEO stands for search engine optimization: making pages easy for Google, Bing and other search engines to crawl, understand and rank.

We built SpellMistake because these daily checks should not need an expensive subscription. Fixing a typo, testing a meta title or finding a broken link should be fast, with no popups and no sign up walls.

MOST SEO TOOLS CHECK ONE OF THREE THINGS

Content checks

The words on a page: spelling, grammar, keyword density, readability and headings.

On-page code checks

The page code: title tag, meta description, canonical URL, Open Graph tags and schema markup.

Technical checks

The website itself: robots.txt, XML sitemaps, redirects, HTTP status codes, SSL certificates and page speed.

> why --free-seo-tools

Why use free online SEO tools?

Six simple reasons to check every page before and after you publish.

Catch mistakes early

Find typos, missing tags and broken links before Google or your readers do.

Save time

Get a clear answer in seconds instead of checking page code by hand.

Help search engines crawl your site

Clean robots.txt rules, sitemaps and redirects make crawling and indexing easier.

Write better content

Clear, correct text keeps readers on the page and builds trust.

Spend nothing

Free SEO tools cover most daily checks, so you only pay for big platforms when you really need them.

Work from any device

Every tool runs in your browser on desktop, tablet and phone. Nothing to install.

> whoami

Who SpellMistake SEO tools are for

Our free website SEO tools are made for anyone who publishes online. If that is you, these tools help you do it with fewer mistakes.

Bloggers

Clean posts, better titles and fewer typos.

Content writers

Polish drafts and check keyword use.

Students

Check essays and learn SEO basics for free.

Small business owners

Fix your own website without an agency.

Ecommerce stores

Better product titles, links and speed.

SEO freelancers

Quick checks and audits for client sites.

Marketing agencies

Fast checks and fixes across many sites.

Web developers

Test redirects, headers, robots.txt and schema.

> top --tools

Popular SEO tools for your website

Start with the free tools our users open most.

SEO Audit Tool

A full SEO check of one page or a whole website, with a score and a fix list.

Spell Checker

Find and fix typos as you type, in US or UK English.

Grammar Checker

Grammar, punctuation and style fixes with one click.

Meta Title Checker

Make sure your title fits on Google in pixels.

Broken Links Checker

Find dead links and their status codes on any page.

Robots.txt Generator

Create crawl rules for Google, Bing and AI bots.

XML Sitemap Generator

Build a clean sitemap.xml so search engines find every page.

Domain Rating Checker

Check site authority with Domain Rating by Ahrefs.

> write && check && publish

All-in-one SEO tools in one place

Most people jump between five different websites to check one page. With SpellMistake you can write, check and publish in one place. Start with the writing tools, move on to the on-page and technical checks, then confirm everything with a full audit. Every tool links to the next step.

01 / WRITE

Write clean content

Spell Checker, Grammar Checker, Article Rewriter

02 / OPTIMIZE

Optimize the page

Meta Title Checker, Keyword Density Analyzer, SERP Simulator

03 / FIX

Fix technical issues

Broken Links, Redirects, Robots.txt, Sitemaps, Speed

04 / AUDIT

Confirm with an audit

SEO Audit Tool: one score and a fix list

> diff --other-tools

How SpellMistake tools are different

Many free SEO tool sites look the same. Here is what we do differently, and why it matters for your results.

SpellMistake SEO tools

Real data only: numbers come from your page or from Google PageSpeed Insights and Ahrefs
Built on Google guidelines for title width, redirects, robots rules and Core Web Vitals
Clear fixes in plain words, not jargon
Privacy first: writing tools run in your browser and we do not save your text
No forced sign up, no fake limits and no popups

Many other free SEO tool sites

Rounded or made-up scores with no clear source
Old rules that no longer match Google documentation
Long reports full of jargon with no clear fix
Your text uploaded to a server and sometimes stored
Sign up walls, popups and upsells before you see a result

> find --task

The Best Free SEO Tool Online for Each Task

Not sure where to start? Find your task below and open the matching SpellMistake tool. Each one is free and works without an account.

Fix typos before you publishSpell CheckerSpelling mistakes with fixes, US or UK English

Clean up grammar and punctuationGrammar CheckerGrammar, punctuation and style issues with one-click fixes

Reword a paragraph or articleArticle RewriterNew wording with Light, Medium or Strong changes

Audit a page or a full websiteSEO Audit Tool50+ checks, a score out of 100 and a fix list

Write a title that fits on GoogleMeta Title CheckerPixel width, length and keyword position

Preview your Google resultSERP SimulatorDesktop and mobile snippet preview

Check keyword useKeyword Density AnalyzerTop words and phrases, plus focus keyword checks

Find broken linksBroken Links CheckerDead links and their status codes on any page

Check redirectsRedirect Chain CheckerEvery hop of a 301 or 302 redirect chain

Test page speedPageSpeed CheckerLighthouse scores and the top speed fixes

Check Core Web VitalsCore Web Vitals CheckerReal-user LCP, INP and CLS from Chrome data

Create a robots.txt fileRobots.txt GeneratorPresets for Google, Bing and AI crawlers

Build an XML sitemapXML Sitemap GeneratorA clean sitemap.xml from a site crawl

Add schema markupSchema Markup GeneratorJSON-LD for FAQ, Article, Product and more

Check site authorityDomain Rating CheckerDomain Rating by Ahrefs for up to 100 sites

> ls --categories

Online SEO Tools by Category

A short guide to each group of SpellMistake tools, so you know which one fits your task.

Content writing tools

Clean, clear text is the base of good SEO. The Spell Checker finds typos as you type in US and UK English. The Grammar Checker catches grammar, punctuation and style problems, such as “its” vs “it’s”. The Article Rewriter rewords a draft while keeping your keywords, and the Word Counter shows word count and reading time.

View all content tools

On-page SEO tools

On-page SEO is everything Google reads on the page itself. The Meta Title Checker and Meta Description Checker measure your snippet in pixels. The Meta Tags Analyzer reads every tag on a live URL, and you can check headings with the Headings Extractor and keyword use with the Keyword Density Analyzer.

View all on-page SEO tools

Technical SEO tools

Technical SEO makes sure search engines can crawl and index your site. Create and test crawl rules with the Robots.txt Generator and Robots.txt Validator. Build sitemaps with the XML Sitemap Generator and add structured data with the Schema Markup Generator. Other tools cover .htaccess, ads.txt, SSL, security headers and IndexNow.

View all technical SEO tools

SEO audit and site health tools

The SEO Audit Tool is the best free SEO audit tool to start with. It checks one page or crawls up to 100 pages and gives a health score with a fix list. For deeper checks, use the Broken Links Checker, HTTP Status Checker and Redirect Chain Checker. For speed, use the PageSpeed Checker and Core Web Vitals Checker.

View all site health tools

SERP and keyword tools

SERP means search engine results page. The SERP Simulator shows how your page will look on Google on desktop and mobile. The SERP Comparator puts your page next to competitors, and the Google Entity Checker tells you if your brand is in the Google Knowledge Graph.

View all SERP tools

Link and authority tools

Backlinks are still a strong ranking signal. The Domain Rating Checker shows Domain Rating by Ahrefs for one site or up to 100 at once. The Page Rank Checker shows Open PageRank scores, and the Backlink Price Calculator gives a fair price range for a guest post or link.

View all link and authority tools

SEO calculators

Plan your SEO budget and keywords with numbers, not guesses. The SEO ROI Calculator shows what organic traffic is worth. The Keyword Value Estimator and Keyword Opportunity Score help you pick the long-tail keywords that are worth your time.

View all SEO calculators

Web utilities

Handy checks for any website. Look up a domain with the Domain Age Checker, DNS Lookup and Wayback History Checker. Other tools include the Page Size Checker, URL Encoder and Decoder and Website Screenshot Generator.

View all web utilities

> how-to --5-steps

How to Use SEO Tools Free Online: 5 Simple Steps

You do not need to use every tool. Follow these five steps for any new or old page.

Audit the page

Run the SEO Audit Tool on your URL. It gives you a score and a list of the most important fixes.

Fix the content

Paste your text into the Spell Checker and Grammar Checker. Then check keyword use with the Keyword Density Analyzer.

Fix the snippet

Test your title and description with the Meta Title Checker and preview the result in the SERP Simulator.

Fix the technical side

Check links, redirects, robots.txt, sitemap and page speed with the technical SEO tools.

Check again and track

Run the audit again after your changes. Google can take a few days or weeks to show the effect, so track results in Google Search Console.

> how --it-works

How Do Online SEO Tools Work?

Online SEO tools work in one of three ways: they read your text, they read your web page, or they look up data from a trusted source.

Text tools

Tools like the Spell Checker and Article Rewriter run in your browser. The Spell Checker uses Hunspell word lists from SCOWL, and the Grammar Checker can use LanguageTool for a deeper check.

Data tools

Tools like the PageSpeed Checker and Domain Rating Checker ask trusted public sources for real numbers about speed, authority, domain age, DNS records and site history.

Data from:

We never show made-up scores. If a source cannot answer, the tool tells you instead of guessing.

> compare --free --paid

Free SEO Tools vs Paid SEO Tools

For small sites, bloggers and students, free SEO tools do most of the daily work. Here is how they compare.

Need	Free SEO tools	Paid SEO platforms
On-page checks	Yes, fully covered	Yes
Technical SEO checks	Yes, page by page or small crawls	Yes, large scheduled crawls
Spelling and grammar	Yes	Sometimes
Keyword search volume database	Limited	Yes
Full backlink index	Domain Rating only	Yes
Rank tracking over time	No	Yes
Price	Free	Monthly fee

Free SEO tools are enough if

Add a paid platform if

You need a large keyword database, daily rank tracking or a full backlink index. Most agencies and large sites use a paid platform for that, and keep free tools for quick checks.

> man seo

SEO Terms You Will See in SpellMistake Tools

New to SEO? These are the most common terms in our tools and reports, explained simply.

SEO: Search engine optimization. Making pages easy for search engines to find, understand and rank.
SERP: Search engine results page. The list of results Google shows for a search.
Title tag: The clickable headline of your page in search results. Keep it under about 600 pixels.
Meta description: The short summary under the title in search results. It can improve clicks.
Keyword density: How often a keyword appears compared with the total number of words.
Long-tail keyword: A longer, more specific search phrase. Fewer searches, but often easier to rank for.
Robots.txt: A file that tells crawlers which parts of a site they may visit.
XML sitemap: A file that lists the pages you want search engines to index.
Indexing: When a search engine stores your page so it can appear in results.
Canonical URL: The main version of a page when the same content lives at more than one URL.
301 redirect: A permanent move from one URL to another. It passes most ranking signals.
HTTP status code: The server reply for a page, such as 200 (OK), 301 (moved) or 404 (not found).
Core Web Vitals: Google page experience metrics: LCP (loading), INP (responsiveness) and CLS (visual stability).
Schema markup: Structured data, usually JSON-LD, that helps Google show rich results like FAQs.
Hreflang: A tag that tells Google which language or country version of a page to show.
Backlink: A link from another website to yours. Quality backlinks build authority.
Domain Rating (DR): An Ahrefs score from 0 to 100 for the strength of a site’s backlink profile.
E-E-A-T: Experience, Expertise, Authoritativeness and Trustworthiness: signals of content quality.

More Free Tools Coming Soon

SpellMistake grows every month. Next on our list is a free Plagiarism Checker, plus more writing and technical SEO tools. Many of our tools started as a request from a user, so tell us what would save you time.

Next up:

SpellMistake SEO Tools FAQ

Quick answers about our free online SEO tools, the data behind them and your privacy.

What are free online SEO tools?

Free online SEO tools are web apps that check and improve how a website appears in search engines, at no cost. They cover tasks like spell checking, meta tag testing, broken link checks, page speed tests and full SEO audits. You use them in your browser without installing anything.

Are SpellMistake SEO tools really free?

Yes. Every SpellMistake tool is free to use online and needs no account. Some tools have a fair use limit per minute or per day so the service stays fast for everyone.

What is the best free SEO tool online?

It depends on the task. For a full check of a page or website, start with the SpellMistake SEO Audit Tool. For writing, use the Spell Checker and Grammar Checker. For speed, use the PageSpeed Checker and Core Web Vitals Checker.

Do I need to sign up or download anything?

No. All SpellMistake tools work in your web browser on desktop and mobile. Open a tool, add your text or URL and get results in seconds.

Can I use these SEO tools for any website?

Yes. The page and site tools work with any public website, whether it is built on WordPress, Shopify, Wix, Webflow or custom code. The writing tools work with any text.

How do I use SEO tools?

Start with an SEO audit to find the biggest problems, then fix them one by one with the matching tool: writing tools for text, on-page tools for titles and meta tags, and technical tools for links, redirects, robots.txt, sitemaps and speed.

Can free SEO tools improve my Google rankings?

They help you find and fix the problems that hold pages back, such as typos, weak titles, broken links and slow loading. No tool can guarantee a ranking. Useful, original content and a healthy site matter most.

Where does the data in SpellMistake tools come from?

Writing tools work in your browser. Page tools read the public page you enter. Data tools use trusted sources such as Google PageSpeed Insights, the Chrome UX Report, Domain Rating by Ahrefs, Open PageRank, RDAP records and the Internet Archive Wayback Machine.

Is my text or website data saved?

No. SpellMistake does not save the text you check. The Spell Checker and Article Rewriter run fully in your browser, and URL checks are only used to show you the result.

> run --seo-audit

Not sure where to start? Audit your page first.

Get a free SEO score and a clear fix list in under a minute.