What are the best free SEO tools?
The genuinely free-forever SEO tools worth using are Google Search Console, Google Analytics 4, PageSpeed Insights, Bing Webmaster Tools, Screaming Frog's free tier (500 URLs) and Ahrefs Webmaster Tools for sites you own. Together they cover monitoring, technical crawling, speed and backlinks at no cost. What they don't cover is competitor research, keyword volume at scale, and the judgement to decide what any of it means.
"Free" means at least three different things in this category, so start there.
Free forever, free trial, or free lead magnet?
| Type | What it means | Examples |
|---|---|---|
| Free forever | Permanent, no card, real capability | Search Console, GA4, PageSpeed Insights, Bing Webmaster Tools |
| Free tier | Permanent but capped | Screaming Frog (500 URLs), Seobility (~1,000 pages), Moz free tools |
| Free for your own site | Full data, but only on domains you verify | Ahrefs Webmaster Tools |
| Free trial | Time-limited, then paid | Semrush, Moz Pro, SE Ranking |
| Free lead magnet | A score in exchange for your email | Most "instant SEO audit" widgets |
The last row is worth naming plainly. If a tool won't show results without an email address, the results are the price of the email.
The free stack, by job
Seeing what Google sees — Google Search Console
The single most important tool in SEO, free, no tier. Which queries you appear for, with clicks, impressions, position and CTR. Which pages are indexed and which are excluded and why. Real Core Web Vitals field data from actual Chrome users. Manual actions. Nothing paid replaces this, because it's the primary source rather than an estimate.
Where it stops: your own site only. No competitor data, no keyword volume, sixteen months of history.
Technical crawling — Screaming Frog (free tier)
Crawls up to 500 URLs at the same depth as the paid version. Broken links, redirect chains, duplicate and missing titles, missing meta descriptions, page depth, missing alt text. Combine with your sitemap to find orphan pages.
Where it stops: the 500 URL cap, and JavaScript rendering requires configuration. Licence is $279/year.
Backlinks — Ahrefs Webmaster Tools
Free for domains you own and verify. Referring domains, anchor text distribution, lost links, plus a site audit. The best free backlink data available.
Where it stops: your verified sites only. Competitor link research needs a paid plan.
Speed — PageSpeed Insights / Lighthouse
Free and unlimited. Core Web Vitals lab scores plus field data where Google has enough traffic. Run your five main templates rather than every page — template problems repeat.
Where it stops: one URL at a time, no crawl, and lab scores can differ substantially from real-user data.
A second search engine — Bing Webmaster Tools
Free, and useful even if Bing traffic is negligible: it gives backlink and keyword data Google doesn't, plus its own crawl diagnostics. Also increasingly relevant as Bing's index feeds AI answer surfaces.
Where it stops: it's Bing's index, not Google's.
Analytics — Google Analytics 4
What visitors do after arriving. Set up conversion tracking. Organic sessions is a vanity number; organic conversions is a business number.
Where it stops: GA4 tells you what happened, not why, and its default reports are not built for SEO questions.
Keyword ideas on a budget
Free options exist but are thin: Google autocomplete and People Also Ask, Google Trends for relative interest over time, and free daily-limited searches from tools like Ubersuggest. Search Console's query report is the best free keyword source you have, because it shows terms you already appear for — usually including some you didn't know about.
Where it stops: no reliable volume data, no difficulty scores, no competitor gap analysis.
Seven free tools you can use right here
We built these because the queries exist and the answers should be free.
| Tool | What it does |
|---|---|
| Schema Markup Validator | Checks your JSON-LD against schema.org and flags the types Google has retired. See schema markup. |
| llms.txt Generator + Checker | Builds a curated llms.txt and checks an existing one. See llms.txt explained. |
| Free Audit Preview | Real findings on your page, and a plain statement of what it didn't check. No email required. |
| Rank Checker | Where a domain ranks on Google for up to 5 keywords, by country and device. See rank trackers compared. |
| AI Visibility Checker | Whether AI engines mention your brand for a query you choose. |
| SEO Cost Estimator | Prices the work you need so you can compare it against a year of subscriptions. |
| Internal Link Auditor | Maps your internal link graph and finds orphan pages. See internal linking. |
What no free tool will do
Three gaps, and they're the expensive ones.
Prioritisation. Free tools produce lists — often hundreds of items with a severity label. Comparison testing has found tools agreeing on severity only about a third of the time. A list of 340 issues with unreliable severity is a reason to freeze, not a plan.
Judgement. No tool will tell you that two of your pages are competing for the same query and one should be merged. None will tell you a page has been decaying for eight months. None will tell you which fixes justify engineering time.
Competitor intelligence at depth. Free tools are built around your own verified properties. Understanding why a competitor outranks you — their link profile, their content depth, their internal linking — requires paid data.
The realistic assessment
For a site under 500 pages with stable traffic, the free stack is genuinely sufficient for detection. Independent testing suggests the best free tools catch roughly two-thirds to three-quarters of what a paid platform finds on small sites.
The gap concentrates in three areas — backlink toxicity assessment, JavaScript rendering audits, and log file analysis. If your site is JavaScript-heavy, that middle one matters enormously: a free crawl can report a clean site while Googlebot sees empty pages. That's the most dangerous false negative in this category.
Use the free stack. Come back when your site outgrows 500 pages, when traffic drops without explanation, or when you have a list and no idea where to start.
Frequently asked questions
What is the best free SEO tool? Google Search Console, because it reports data from Google directly rather than estimating it. Pair it with Screaming Frog's free tier for technical crawling and Ahrefs Webmaster Tools for backlinks.
Are free SEO tools good enough? For a site under 500 pages, largely yes on detection — testing suggests the best free tools catch two-thirds to three-quarters of what paid platforms find. They cannot prioritise findings or make judgement calls.
Is Ahrefs free? Ahrefs Webmaster Tools is free for domains you own and verify, giving site audit and limited backlink data. The main toolset has no free-forever plan; paid tiers start at $129 a month.
Is Screaming Frog free? The free version is permanent and crawls up to 500 URLs at the same depth as the paid version. A licence costs $279 a year and removes the cap.
Is Semrush free? Semrush offers a limited free account and a time-limited trial. It is not a free-forever tool. Paid plans start around $139.95 a month.
Can I do keyword research for free? Partly. Search Console shows terms you already rank for, Google autocomplete and People Also Ask show related queries, and Google Trends shows relative interest. What you won't get free is reliable volume, difficulty scores or competitor gap analysis.
Why do free SEO audit tools ask for my email? Because the report is a lead-generation asset. A tool that gates results behind an email is selling your contact details to a sales process, not giving you an audit.
When free stops being enough
Free tools tell you what's broken. Deciding what to fix first is the part that costs money — and the part that determines whether any of it pays back.
- 360 SEO Page Audit — one page, every finding ranked and explained
- Site SEO Audit — 22 sections, including the three things no free tool catches
- Keyword Research Lite — the finished keyword list, once, with no subscription
Read a complete sample audit first. Free, no email, on a real site.