Tool Category: seo

Twelve browser-based SEO utilities for generating meta tags, sitemap XML, Open Graph previews, FAQ schema, robots.txt rules, and canonical tags, built for indie founders, freelance SEOs, and marketing engineers who ship changes without waiting on a dev sprint. A solo SaaS founder prepping a Product Hunt launch can draft the <title> and <meta name="description">, generate a sitemap.xml, and preview how Google will render the result in a single browser tab. No sign-up. No crawl of your domain. Nothing shipped to a marketing SaaS.
What you can do with SEO tools
Most visitors arrive on this page for one of three jobs:

Write Open Graph tags that control how Slack, LinkedIn, and X unfurl a URL with Open Graph Generator.
Build an XML sitemap from a URL list using Sitemap Generator.
Produce FAQPage JSON-LD that qualifies for the accordion rich result with FAQ Schema Generator.

Pick SEO Tools when the deliverable is something a crawler reads, <meta> tags, JSON-LD blocks, sitemap entries, robots directives, or canonical URLs. For JSON pretty-printing, regex, or general-purpose validation, Developer Tools are the closer fit. For Twitter card generation and caption-length checks on the post side, Social Media Tools handle the downstream formatting. SEO Tools earn their spot when the output lives in <head> or at a fixed URL like /robots.txt and the audience is Googlebot or an LLM crawler, not a human reader. For the whole-site strategy around these tools, see the full guide to a free SEO toolkit.
The SEO toolkit

Tool
What it does
When to use

Apple App Site Association Generator
Generates the AASA JSON file that links an iOS app to a web domain.
Wiring Universal Links so iOS opens your app on specific routes, not Safari.

Canonical Tag Generator
Produces a <link rel="canonical"> tag pointing to the preferred URL.
Consolidating 12 UTM-tagged variants of one product page.

Disavow File Generator
Formats spammy domains into the domains.txt Search Console expects.
Submitting a disavow after 300 negative-SEO links hit the domain.

FAQ Schema Generator
Writes FAQPage JSON-LD from question-and-answer pairs.
Qualifying a pricing-page FAQ for the accordion rich result.

Keyword Density Checker
Counts term frequency and ranks the top keywords in copy.
Auditing a 2,000-word draft for accidental keyword stuffing.

Keyword Overlap Analyzer
Compares two keyword lists and returns shared and unique terms.
Picking ten target queries from an 80-candidate competitor analysis.

Meta Tags Generator
Builds <title>, meta description, and viewport tags with length limits.
Filling a new landing page’s <head> with a 60-char title.

Open Graph Generator
Writes og:title, og:description, og:image, and og:type tags.
Controlling the card a LinkedIn post shows for your new blog URL.

Open Graph Preview
Renders the social card a URL will show on Facebook, LinkedIn, and Slack.
Spotting a missing og:image before a launch-day announcement.

Robots.txt Generator
Creates robots.txt with allow, disallow, and sitemap directives.
Blocking /admin/ from Googlebot while letting a staging bot crawl.

SERP Preview Tool
Simulates how a title and description render in Google’s result page.
Checking whether a 63-character title truncates on mobile.

Sitemap Generator
Builds XML sitemaps with lastmod, changefreq, and priority fields.
Shipping a sitemap.xml for a 40-page site before launch day.

Schema and structured data. FAQ Schema Generator outputs FAQPage JSON-LD ready to drop into a JSON-LD script block. On the mobile-app side, Apple App Site Association Generator produces the AASA file iOS Universal Links require. Both are deterministic text outputs, no crawl, no API key.
Meta tags and previews. Meta Tags Generator handles the core <title> and meta description pair with character-count limits. Open Graph Generator and Open Graph Preview pair as write-then-check for social cards, and SERP Preview Tool shows the final render at desktop and mobile widths.
Crawler directives and keyword work. Robots.txt Generator writes allow and disallow rules per user-agent; Sitemap Generator produces the XML feed Googlebot reads; Canonical Tag Generator handles duplicate-URL consolidation. For keyword work before publish, Keyword Density Checker and Keyword Overlap Analyzer audit copy and compare target lists. Disavow File Generator formats the submission file when Search Console flags bad backlinks.
How to choose the right SEO tool

Writing a new page’s <head> from scratch → use Meta Tags Generator for the title and description pair, then Open Graph Generator for the social card.
Auditing how the result will render in search → use SERP Preview Tool before you publish, not after.
Shipping a new site under 100 pages → use Sitemap Generator from a URL list and Robots.txt Generator for crawl rules.
Qualifying for a rich FAQ result → use FAQ Schema Generator and paste the JSON-LD into <head>.
Consolidating duplicate URLs from UTM or filter parameters → use Canonical Tag Generator to pick the one winner.

The trade-off worth weighing is coverage versus depth. A browser generator writes the correct tag once; a paid SEO suite crawls a whole site, tracks rankings, and costs $99-$399 a month. For a five-page landing site these generators cover the 80% that matters. For an 8,000-SKU catalog, layer them on top of a crawler like Screaming Frog, the tags and schema plug in directly.
Frequently asked questions
Q: Are these free SEO tools actually free, or is there a paid tier?
All twelve are free and run entirely in your browser, no sign-up, no trial limit, no paid tier gating features. The difference from a SaaS like Semrush is that these are single-purpose generators, not crawlers or rank trackers. For write-tags-and-preview workflows, Meta Tags Generator and SERP Preview Tool cover the work without a subscription.
Q: How do I generate a sitemap.xml for my website?
Paste your URL list into Sitemap Generator. The tool wraps each URL in a <url> element with optional <lastmod>, <changefreq>, and <priority> fields and outputs a complete <urlset> ready to upload as /sitemap.xml at the domain root. Submit the URL in Search Console’s Sitemaps report, Googlebot starts fetching within hours.
Q: What’s the character limit for meta titles and descriptions?
Google truncates titles around 580 pixels, roughly 55-60 characters, and descriptions at about 155 characters on desktop, 120 on mobile. Meta Tags Generator flags titles over 60 and descriptions over 155. Preview the render with SERP Preview Tool at both widths, because Google measures pixels, not characters.
Q: Do I need FAQ schema on every page?
FAQ schema only earns the rich accordion result when the page contains a real question-and-answer block visible to visitors. FAQ Schema Generator produces valid FAQPage JSON-LD, but Google tightened eligibility in August 2023, FAQ rich results now appear mostly for government and health sites. Add the schema for the semantic markup and treat the rich result as a bonus.
Q: Where does Google expect the robots.txt file to live?
At the domain root, exactly https://example.com/robots.txt. Robots.txt Generator outputs the full file with User-agent, Allow, Disallow, and Sitemap directives. Upload it to the web root (not a subdirectory) and confirm it loads cleanly before Googlebot hits it, a 404 or 500 delays every crawl-rule change.
Q: When should I disavow backlinks?
Disavow only when Search Console shows a manual action or a clear pattern of spammy, bought, or negative-SEO links. Disavow File Generator formats the domains.txt file the Search Console Disavow Tool accepts. Google’s John Mueller has repeated that most sites never need to disavow, Google already ignores low-quality links by default.
Q: What’s the difference between a canonical tag and a 301 redirect?
A canonical tag tells search engines which duplicate to index while both URLs stay reachable; a 301 sends users and crawlers from the old URL to the new one permanently. Use Canonical Tag Generator when duplicates must remain live for filters, sorting, or UTM tracking. Use a 301 when the old URL should disappear.
Related categories
SEO work often touches adjacent toolkits. Developer Tools cover JSON validation and regex for wrangling sitemap URL lists. Social Media Tools handle Twitter card generation and caption character counting. Text Tools cover slug generation, case conversion, and content-length checks that matter before a <meta name="description"> goes live.

Canonical Tag Generator Online Free

Canonical Tag Generator and Generate rel=canonical, og:url, and twitter:url tags from any URL. – with HTTPS check and trailing-slash strip.

Schema Markup Extractor Online

Extract Schema.org structured data from any HTML. Detect JSON-LD, Microdata, and RDFa instantly. Free, offline, client-side – secure.