The best free keyword research tool depends on where you are in the process. Google Search Console is unbeatable for finding what you already rank for. Google Keyword Planner gives you the most reliable volume data at zero cost. Ahrefs free tools give you the most SEO metrics without paying. Together, those three cover most of what a paid tool costs $99/month to provide.
This guide covers 11 free and freemium keyword research tools, what each one actually gives you for free, what it holds back, and how to combine them into a working research workflow. We tested every tool hands-on and verified the current free-tier limits so you do not have to.
What We Looked for in a Free Keyword Research Tool
Not every free keyword tool is worth your time. These are the four things that separated the useful ones from the ones that just want your email:
- Search volume data quality. Does it show real numbers, or vague ranges? A tool that says “1K-10K monthly searches” is nearly useless for prioritization.
- Keyword difficulty scoring. Knowing how hard a keyword is to rank for matters as much as knowing how many people search for it.
- Honest free limits. Some tools call themselves free but require a credit card, throttle results to 3/day, or only show top-level data without detail. We flagged every restriction clearly.
- Data freshness and accuracy. Free tools often run on stale data or smaller datasets. We noted where data quality is a limitation.
Best Free Keyword Research Tools at a Glance
| Tool | Best For | Free Limit | Standout Feature | Account Needed? |
|---|---|---|---|---|
| Google Search Console | Existing content opportunities | Unlimited | Real Google ranking data | Yes (Google account) |
| Google Keyword Planner | Volume validation | Unlimited | Most accurate volume data | Yes (Google Ads) |
| Ahrefs Free Tools | SEO metrics without paying | 150 results/search | KD score + SERP data | Yes (free account) |
| Semrush Free | Competitor keyword research | 10 reports/day | Competitor organic keywords | Yes |
| Ubersuggest | Beginners | 3-10 searches/day | Content ideas tab | Optional |
| AlsoAsked | Question-based keywords | 3 searches/day | PAA question trees | Optional |
| Google Trends | Seasonal and rising keywords | Unlimited | Relative interest over time | No |
| Moz Keyword Explorer | Monthly strategy decisions | 10 searches/month | Priority score | Yes |
| Keywords Everywhere | Passive research while browsing | Basic free; credits for full | Real-time data on Google | Yes (extension) |
| Google Autocomplete | Long-tail discovery | Unlimited | Reflects real user queries | No |
| ChatGPT / AI Tools | Brainstorming seed keywords | Generous free tier | Unlimited idea generation | Yes |
The Best Free Keyword Research Tools
1. Google Search Console — Best for Tracking What You Already Rank For
Google Search Console is the only free tool that gives you real performance data directly from Google. Every other free tool is estimating. Search Console is reporting what actually happened.
The Performance report shows you the exact queries people used to find your pages, your average position for each query, click-through rate, and total impressions. That data comes straight from Google’s index — no third-party estimates involved.
Key features:
- Top 1,000 keywords per property with impressions, clicks, CTR, and position
- Filter by page to see which queries trigger a specific URL
- Compare date ranges to spot declining keywords
- URL Inspection tool to check indexing status
Free limits: Completely free with any Google account. No search limits, no credit card, no tier restrictions.
Best for: Sites that already have content published. If you are starting from scratch with no pages indexed yet, Search Console has nothing to show you.
Pro tip: Filter the Performance report by a specific page, then sort by position. Any keyword where you rank between position 5 and 20 is a potential quick win. A focused content update targeting those specific queries can move you into the top 3 without needing a new article.
2. Google Keyword Planner — Best for Search Volume Data
Google Keyword Planner is the most accurate free source of keyword volume data that exists. It is built on the same data Google uses to run Google Ads, which means the numbers come from the actual source rather than third-party panel estimates.
You need a Google Ads account to use it, but you do not need to run or pay for any ads. Setting up a free account takes five minutes.
Key features:
- Keyword ideas grouped by theme, with volume estimates
- Monthly search volume trends over the past 12 months
- Geographic breakdown by country and region
- Competition level and suggested bid data (useful for understanding commercial intent)
- Forecasting tool for estimating future search demand
Free limits: Free with a Google Ads account. The catch: without an active, spending campaign, Google shows you volume ranges (like “1K-10K”) instead of exact numbers. The ranges are often wide enough to be frustrating.
Best for: Initial keyword research, validating that a topic actually has search demand, understanding seasonal patterns, and identifying high-commercial-intent keywords via the bid data.
Pro tip: If you need exact volume numbers, run a small campaign with a $1/day budget on a single keyword. Google will start showing exact figures within a few days. You can pause the campaign immediately and the exact data persists. Some people keep a permanently paused campaign just to unlock the exact numbers.
3. Ahrefs Free Keyword Tools — Best for SEO Metrics Without Paying
Ahrefs offers several standalone free tools that give you genuine SEO data without requiring a paid subscription. The most useful combination is the Keyword Generator plus Webmaster Tools.
Keyword Generator (ahrefs.com/keyword-generator):
- Enter a seed keyword and get up to 150 keyword ideas
- Each result shows a keyword difficulty (KD) score from 0-100
- Filters for questions, prepositions, and comparisons
- Shows the top-ranking pages for each keyword
Ahrefs Webmaster Tools (free account required):
- Connect your own website and get a full backlink profile, organic keyword rankings, and a site audit covering 170+ technical SEO issues
- Up to 1,000 ranking keywords with traffic estimates and position data
- 5,000 monthly crawl credits for Site Audit (HTML pages only)
- “Low-hanging fruit” filter to find quick-win opportunities on your own site
SERP Checker (ahrefs.com/serp-checker):
- Enter any keyword and see the top-ranking pages with DR, backlink counts, and estimated traffic
- 10 free checks per day
Keyword Difficulty Checker (ahrefs.com/keyword-difficulty):
- Get a KD score for up to 10 keywords at a time
- Shows estimated backlinks needed to rank in the top 10
- 10 free checks per day
Free limits: Keyword Generator: 150 results per search. Webmaster Tools: your own verified sites only, up to 1,000 keywords visible. SERP Checker and KD Checker: 10 checks/day each.
Best for: Anyone doing serious SEO who wants real difficulty scores and competitor data without paying. Webmaster Tools is particularly underrated — it gives you Ahrefs-quality data for your own site completely free.
Pro tip: If you already have a site, set up Ahrefs Webmaster Tools first. The “Organic Keywords” report filtered by position 4-10 is the closest free equivalent to finding your ranking opportunities, and the data quality matches the paid product.
4. Semrush Free Tier — Best for Competitor Keyword Research
Semrush’s free tier is frustratingly limited in some ways — but the one thing it does well for free is remarkably useful: it lets you enter any competitor’s domain and see which organic keywords they rank for.
Key features (free tier):
- Domain Overview: top organic keywords for any domain, estimated traffic
- Keyword Overview: volume, KD, CPC, and SERP features for individual keywords
- Keyword Magic Tool: up to 10 results for keyword phrase research
- Position Tracking: 10 keywords tracked (limited)
Free limits: 10 keyword analytics reports per day. Free account is required (no credit card). The 10-report limit resets daily.
Best for: Researching what your direct competitors rank for. If you know a competitor is ranking well and you want to understand their keyword footprint, Semrush free tier is the fastest way to get that picture.
Pro tip: Use your 10 daily searches strategically. Do not waste them on your own domain (use Ahrefs Webmaster Tools for that). Instead, run one competitor per day through Domain Overview and export the top keywords before your limit resets. Over a week, you build a detailed picture of your competitive landscape.
5. Ubersuggest — Best for Beginners
Ubersuggest was built by Neil Patel as an entry-level SEO tool, and that focus on beginners shows in the interface. Everything is clearly labeled, each metric comes with a brief explanation, and the workflow is straightforward.
Key features:
- Keyword ideas with volume, CPC, and SEO difficulty
- Content Ideas tab showing which content gets the most links and social shares for a topic
- Site Audit with a basic score and critical errors
- Competitor analysis showing top organic pages
Free limits: 3 searches per day without an account. With a free account (email only, no card): approximately 10 searches per day. Limits are enforced per search query, not per result page.
Best for: People who are new to keyword research and want a clean, guided experience rather than a data-dense interface.
Pro tip: Before writing any new article, run your main topic through Ubersuggest’s Content Ideas tab. It shows which existing articles on that topic earned the most backlinks and shares. That tells you what format and angle to aim for before you write a word.
6. AlsoAsked — Best for Question-Based Keywords
AlsoAsked is the best free tool for discovering the questions people ask around a keyword. It pulls directly from Google’s “People Also Ask” (PAA) database and maps out question trees showing how topics branch off from each other — giving you a visual hierarchy of how Google connects related questions.
AnswerThePublic was the go-to tool for this use case for years, but it was acquired by NP Digital in 2022 and removed its free tier in 2024. Plans now start at $20/month. AlsoAsked fills the same role and remains free with a daily limit.
Key features:
- Visual tree showing how “People Also Ask” questions branch from any seed query
- Export question trees as CSV or image
- Shows the parent/child relationship between questions (which question leads to which follow-up)
- Covers Google in multiple countries and languages
Free limits: 3 free searches per day without an account. Free account extends this slightly. No credit card required.
Best for: Planning FAQ sections, structuring article headings around PAA questions, building topical authority content, and finding the natural language questions people ask about your topic.
Pro tip: Run your main keyword through AlsoAsked and export the full question tree. Each branch represents a subtopic you can either cover in the same article or use as a standalone content idea. The second and third level questions are often the best long-tail content angles because they have lower competition than the root question.
7. Google Trends — Best for Seasonal and Rising Keywords
Google Trends is one of the most underused free SEO tools. It does not give you keyword volumes, but it does show you something more useful for timing and topic validation: relative search interest over time.
Key features:
- Interest over time graph going back 5+ years
- Geographic breakdown by country, region, and city
- Related queries tab showing “Breakout” (rising fast) and “Top” queries
- Compare up to 5 topics simultaneously
- “Real-time search trends” for breaking news topics
Free limits: Completely free. No account required. No usage limits.
Best for: Timing content to seasonal peaks, confirming a topic is growing rather than declining, finding rising query variants before they become competitive, and comparing keyword phrase variations to see which is gaining traction.
Pro tip: When you have 2-3 keyword variants (for example, “content brief” vs “content brief template” vs “how to write a content brief”), enter all three into Google Trends simultaneously. The comparison view shows which phrase is growing fastest. Target the rising variant even if current search volume appears lower — you are writing for where interest is going, not where it has been.
8. Moz Keyword Explorer — Best for Monthly Strategy Sessions
Moz Keyword Explorer has the most restrictive free tier of any major tool on this list: 10 searches per month. That is not a typo — per month, not per day. But what you get in those 10 searches is genuinely high quality.
Key features:
- Priority score: a single 0-100 score that blends volume, difficulty, and organic CTR
- Monthly volume, KD score, and SERP analysis
- SERP features breakdown (Featured Snippets, Image Packs, etc.)
- Related keywords and questions
Free limits: 10 keyword searches per month on a free account. No credit card required. Results are comprehensive even on the free tier.
Best for: Monthly keyword strategy sessions where you need to make final decisions between competing keyword candidates. The Priority score is particularly useful for breaking ties: it accounts for the fact that some high-volume keywords have low CTR because the SERP is full of ads and SERP features.
Pro tip: Save your 10 monthly searches for your hardest decisions. When you have narrowed down to 2-3 keyword options for a major piece of content and standard volume/difficulty data from other free tools is not giving you a clear winner, run them through Moz. The Priority score often resolves the tie in a way raw numbers cannot.
9. Keywords Everywhere — Best Browser Extension
Keywords Everywhere is a browser extension for Chrome and Firefox that displays keyword data directly inside your Google search results, YouTube, Amazon, and a dozen other platforms. Once it is installed, you see keyword metrics as a sidebar column on every search you do.
Key features:
- Volume, CPC, and competition shown on Google search results
- “Related keywords” and “People Also Search For” sidebar panels
- Trend charts on Google results pages
- Works on Google, YouTube, Amazon, Etsy, eBay, and more
Free limits: Basic keyword data (volume ranges, related keyword suggestions) is available on the free tier. The extension costs $10/year for more detailed metrics with exact volume numbers and full trend data.
Best for: Researchers who do a lot of browsing and want to capture keyword data passively. If you are already reading competitor articles, doing product research, or just using Google normally, Keywords Everywhere surfaces data without any extra steps.
Pro tip: Install Keywords Everywhere even if you plan to use other tools as your primary research method. The “People Also Search For” sidebar on Google is one of the fastest ways to build out a keyword list from a starting point, and it works on every search automatically.
10. Google Autocomplete and Related Searches — Best for Long-Tail Discovery
Google Autocomplete is not a tool — it is a data source that most people walk past every day without realizing what it is telling them. Every suggestion in the Google search bar reflects actual queries that real users have typed. The “Related searches” section at the bottom of every SERP does the same thing with slightly different phrasing.
How to use it:
- Type a keyword and pause before hitting Enter to see the dropdown suggestions
- Scroll to the bottom of any SERP to find “Related searches”
- Look at “People Also Ask” boxes on the SERP for question-based variants
Free limits: Completely free. No account needed. No usage limits.
Best for: Long-tail keyword discovery, finding natural language variations of your target keywords, surfacing “People Also Ask” content angles, and generating topical coverage ideas.
Pro tip: Use the alphabet soup method. Type your seed keyword followed by each letter of the alphabet in turn: “keyword research a”, “keyword research b”, “keyword research c” and so on. Autocomplete surfaces a different set of suggestions for each letter. A 10-minute session using this method can generate 50-100 long-tail keyword ideas from a single seed.
11. ChatGPT and AI Tools — Best for Keyword Brainstorming
AI tools like ChatGPT, Gemini, and Perplexity are not keyword research tools in the traditional sense — they do not have search volume data or real-time index access (outside of specific browse modes). But for one specific task, they are faster and more comprehensive than any dedicated keyword tool: generating large, structured lists of seed keywords, content angles, and topical subtopics.
Available free tools:
- ChatGPT (free tier): excellent for brainstorming, especially structured prompts
- Google Gemini (free): strong for search-intent analysis and related question generation
- Perplexity (free tier): useful because it cites sources, helping you verify topic relevance
What AI tools do well:
- Generating 30-50 long-tail question ideas from a single seed topic in under a minute
- Mapping out a full topical cluster for a pillar page
- Suggesting content angles and subtopics you might not have considered
- Writing keyword research prompts in natural language
Key limitation: AI tools cannot verify search volume, keyword difficulty, or whether a keyword phrase is how real users phrase their searches. Always validate AI-generated keyword ideas through Google Keyword Planner or Ahrefs before committing to them.
Best for: Early-stage brainstorming, topical map planning, and building comprehensive seed keyword lists quickly.
Pro tip: Try this prompt in ChatGPT: “Give me 30 specific long-tail questions someone would search before deciding to [buy/use/choose] [your product or service]. Group them by stage: awareness, consideration, and decision.” The result gives you a full-funnel keyword cluster in about 30 seconds.
Free vs. Paid Keyword Research Tools: What You Give Up
Free tools cover the basics, but paid tools give you depth in ways that matter at scale. Here is what the difference looks like in practice:
| Feature | Free Tools | Paid Tools (Ahrefs/Semrush ~$99-129/month) |
|---|---|---|
| Search volume | Ranges or estimates | Exact historical monthly data |
| Keyword difficulty | Limited (10/day or similar) | Unlimited, across any keyword |
| Competitor research | 10 reports/day (Semrush free) | Full competitor keyword profiles |
| Rank tracking | GSC positions only | Automated daily rank tracking |
| Keyword database size | Smaller, query-dependent | Billions of keywords across all countries |
| Backlink data | Your site only (Ahrefs WMT) | Full backlink profiles for any site |
| Historical data | Limited | Years of trend data |
| Team collaboration | None | Shared projects, reports |
When to upgrade to a paid tool:
- You are publishing more than 2 articles per week and need to prioritize quickly across a large keyword list
- You are doing competitive SEO where knowing competitor backlink profiles matters
- You need exact volume data, not ranges, for business-level content decisions
- You are tracking rankings for more than 10 keywords
For most people starting out — bloggers, small business owners, early-stage content teams — the combination of free tools in this guide is sufficient to build a real SEO presence without spending anything.
How to Do Keyword Research Using Only Free Tools (Step-by-Step)
You can build a complete keyword research workflow using only the tools above. Here is how:
Step 1: Generate seed keywords (ChatGPT + Google Autocomplete) Start with a broad topic and use ChatGPT to generate 30-50 specific long-tail question ideas. Then use Google Autocomplete and the alphabet soup method to surface natural language variations. You should have 80-150 keyword candidates at this stage.
Step 2: Validate search demand (Google Keyword Planner) Take your best candidates into Google Keyword Planner and check which ones have enough search volume to be worth targeting. Filter out anything with fewer than 100 monthly searches unless you are targeting extremely specific niche topics.
Step 3: Check keyword difficulty (Ahrefs Keyword Difficulty Checker) Run your top 10-20 candidates through the Ahrefs KD Checker (10 free/day). Focus on keywords with a KD under 30 if your site is new, or under 50 if you have domain authority. If you need more checks, Semrush’s free 10 daily reports cover the gap.
Step 4: Find question angles (AlsoAsked) For your 2-3 final keyword picks, run them through AlsoAsked to map every “People Also Ask” question and its branches. These become your H2 subheadings, FAQ content, and supporting keyword targets.
Step 5: Check seasonality and momentum (Google Trends) Before committing to a topic, confirm the search trend is flat or growing. A declining trend in Google Trends is a warning sign that the topic is losing relevance. If you are writing seasonal content, Trends also shows exactly when to publish for maximum timing.
Step 6: Monitor your results (Google Search Console) After you publish, Search Console shows you which queries your new content ranks for within a few days. Return to the Performance report monthly to spot keywords where you are ranking in positions 5-20 — those are your easiest improvement opportunities.
Frequently Asked Questions
What is the best completely free keyword research tool? Google Search Console is the best completely free keyword research tool for sites with existing content — it provides unlimited access to real Google ranking data with no restrictions. For new sites with no rankings yet, Google Keyword Planner (free with a Google Ads account) is the best starting point for finding keywords with real search demand.
Is Google Keyword Planner really free? Yes, Google Keyword Planner is free with a Google Ads account. You do not need to run any ads or add payment information to use the keyword research features. The main limitation is that without an active, spending campaign, Google shows search volume as ranges (like “1K-10K/month”) rather than exact figures.
Can I do keyword research without any paid tools? Yes. The combination of Google Search Console, Google Keyword Planner, Ahrefs free tools (Keyword Generator + Webmaster Tools), and Google Trends covers the full keyword research workflow. The limits are on scale and speed — free tools work best when you are researching a handful of keywords at a time rather than building keyword databases at enterprise scale.
What free tool gives the most accurate search volume data? Google Keyword Planner gives the most accurate search volume data of any free tool because it uses Google’s own ad platform data. The limitation is that it shows ranges rather than exact numbers without an active campaign. For exact numbers without paying, the best approach is to cross-reference Google Keyword Planner ranges with Ahrefs free Keyword Generator estimates.
Is Ubersuggest free? Ubersuggest offers a free tier with 3 searches per day without an account or approximately 10 searches per day with a free account. The free tier includes keyword ideas, SEO difficulty scores, and the Content Ideas feature. Ubersuggest also offers paid plans starting at $12/month if you need unlimited access.
When should I switch to a paid keyword research tool? Consider upgrading to a paid tool when free tools become the bottleneck in your workflow. Specific signals: you are spending more than 30 minutes per article just on keyword research because of daily limits, you need exact volume data for business decisions (not just content planning), you are tracking more than 10 keywords at once, or you are doing competitive SEO where you need full backlink and traffic data for competitor sites.
