10 Best Free Keyword Research Tools in 2026 (Tested and Compared)
The best free keyword research tools for 2026 are Google Keyword Planner, Google Search Console, Semrush (free tier), Ubersuggest, Ahrefs Free Keyword Generator, Google Trends, AnswerThePublic, Moz Keyword Explorer, Keywords Everywhere and Keywordtool.io. Each covers a different part of the keyword research workflow: finding seed ideas, validating volumes and spotting content angles. Some are genuinely free with no usage caps. Others are freemium, meaning you get limited daily searches before hitting a paywall. This guide covers all 10, with exact free tier limits for each.
What Makes a Good Free Keyword Research Tool?
A good free keyword research tool doesn’t need to replace a paid subscription. It needs to do three things well.
First, it should give you accurate search volume data, even if the numbers are ranges rather than exact figures. Second, it should show keyword difficulty scores so you can assess whether a keyword is realistically winnable. Third, it should surface related keyword ideas to expand your research beyond the seed term you started with.
The best free tools also make it clear what you can’t do on the free plan, so you’re not chasing data that isn’t there. That transparency is what separates tools worth your time from ones that frustrate you three minutes in.
The 10 Best Free Keyword Research Tools at a Glance
Here’s how the 10 tools compare on the factors that matter most for free-tier research.
| Tool | Best For | Free Tier Limit | Data Source |
|---|---|---|---|
| Google Keyword Planner | Seed keywords and volume data | Unlimited (Google Ads account required) | Google Ads |
| Google Search Console | Optimizing pages you already have | Unlimited (site verification required) | Google Search |
| Semrush (free tier) | Competitor keyword research | 10 searches/day | Semrush database |
| Ubersuggest | Beginners who want an all-in-one view | 3 searches/day | Google Autocomplete + web |
| Ahrefs Keyword Generator | Quick keyword difficulty checks | 100 keyword ideas/search (no account) | Ahrefs database |
| Google Trends | Seasonal and trending topics | Unlimited | Google Search trends |
| AnswerThePublic | Question-based content ideation | ~3 searches/day (no account) | Google + Bing autocomplete |
| Moz Keyword Explorer | Organic difficulty and priority scoring | 10 queries/month | Moz database |
| Keywords Everywhere | In-SERP research without leaving Google | Trend data free; volume requires credits | Google, YouTube, Amazon |
| Keywordtool.io | Platform-specific and long-tail research | 750+ suggestions/search (no account) | Autocomplete data |
Genuinely Free vs. Freemium vs. Free Trial: What’s the Difference?
These three terms get used interchangeably, but they describe very different situations. Knowing which model a tool uses saves you from planning a research session around limits you didn’t know existed.
| Model | What It Means | Example Tools |
|---|---|---|
| Genuinely free | No time limit, no credit system, no payment wall, ever | Google Keyword Planner, Google Search Console, Google Trends |
| Freemium | Free plan exists permanently but limits daily or monthly queries | Semrush (10/day), Ubersuggest (3/day), Moz (10/month) |
| Free trial | Full access for a set period (7–30 days), then requires a paid subscription | Most other SEO suites (not covered in this guide) |
The tools in this guide are either genuinely free or freemium. None require a credit card for the free plan.
The 10 Best Free Keyword Research Tools
Here’s a full review of each tool, including what you get on the free plan, a practical tip and the main limitation to be aware of.
1. Google Keyword Planner: Best for Seed Keywords and Volume Data
Google Keyword Planner is the most widely used free keyword research tool, and for good reason. It pulls data directly from Google’s own ad platform, so the search volume figures reflect real Google search behavior, not estimates based on a third-party panel.
You need a Google Ads account to use it, but you don’t need to run ads or spend any money. Create an account, skip the campaign setup step, and you get full access to the tool.
With Keyword Planner, you can enter a seed keyword or a URL and get hundreds of keyword ideas with monthly search volume ranges, competition levels and average CPC data. It also groups keywords into themes, which is useful for building out topic clusters.
The one catch: if you don’t have an active Google Ads campaign running, the search volumes appear as broad ranges (1K–10K instead of a specific number like 4,400). Running even a minimal campaign (spending as little as $1) unlocks exact volume figures.
Pro tip: Paste a competitor’s URL into the „Start with a website“ field to uncover which keywords their pages are targeting. It’s one of the fastest ways to find keyword gaps.
Limitation: Volume ranges are broad without an active ad spend. The tool is designed for PPC research, so competition metrics reflect ad competition, not organic ranking difficulty.
2. Google Search Console: Best for Optimizing Pages You Already Have
Google Search Console doesn’t find new keywords; it shows the keywords your pages already rank for. That makes it the best tool for a specific and often overlooked use case: finding quick-win optimization opportunities on existing content.
Inside Search Console’s Performance report, you can see every query that triggered an impression for your site, along with the number of clicks, your click-through rate and your average position. Filter by position 8–20 to find keywords where your pages are almost on page one. A targeted content update or a stronger title tag often moves those keywords into the top five.
It’s completely free and requires no third-party data. The only setup step is verifying ownership of your website, which takes about five minutes.
Pro tip: Click into any URL in the „Pages“ tab, then switch to the „Queries“ view to see which keywords drive traffic to that specific page. Use this to find secondary keywords to add to thin content, or feed them into an SEO content brief when planning an update.
Limitation: Search Console only shows data for your own site. It’s not useful for brand-new sites with no organic traffic yet, and it can’t help with competitor research.
3. Semrush (Free Tier): Best for Competitor Keyword Research
Semrush is one of the most powerful SEO platforms available, and its free tier gives you a meaningful taste of what the paid product can do. The free plan allows 10 keyword or domain searches per day, which is enough for targeted competitor research when you use the quota strategically.
The Keyword Magic Tool shows keyword difficulty scores, search volume, CPC, and SERP features for any keyword. The Domain Overview report lets you look up any competitor’s top organic keywords, their estimated traffic, and the number of keywords they rank for, useful for identifying content gaps your site hasn’t covered yet. Both features are available on the free tier, just with daily limits.
Unlike Google Keyword Planner, Semrush provides organic keyword difficulty scores rather than ad competition data, which makes it more useful for SEO planning.
Pro tip: Don’t use your 10 daily searches on keyword ideas you could find in Google Keyword Planner. Save them for competitor domain lookups and keyword difficulty checks on your shortlist.
Limitation: 10 searches per day goes quickly. If you’re doing research for multiple clients or multiple pages in a session, you’ll hit the limit fast. The free plan also caps the number of results returned per search.
4. Ubersuggest: Best for Beginners Who Want an All-in-One View
Ubersuggest, built by Neil Patel, is the most beginner-friendly freemium keyword research tool. Its interface is clean and approachable, and it puts keyword suggestions, SEO difficulty scores, paid difficulty, search volume and content ideas all in one place.
The free plan gives you 3 searches per day without an account, or slightly more with a free account. For each keyword, you get a list of related keyword ideas with volume and difficulty data, a „Content Ideas“ tab showing pages that already rank for the keyword and a basic site audit tool.
Ubersuggest pulls data from a mix of Google Keyword Planner, Google Search Console and its own index, so the numbers are reasonably accurate for most keywords.
Pro tip: Use the „Content Ideas“ tab before writing. It shows which articles currently rank for your target keyword; read the top three before you start writing to understand what the SERP expects.
Limitation: 3 searches per day is a tight limit for active research. Keyword difficulty data is less precise than Ahrefs or Semrush, so use it for directional guidance rather than exact competitive analysis.
5. Ahrefs Free Keyword Generator: Best for Quick Keyword Difficulty Checks
Ahrefs runs one of the largest SEO data sets in the world, and its free Keyword Generator gives you a slice of that data at no cost and with no account required. Enter any keyword and you get up to 100 keyword ideas with Ahrefs‘ keyword difficulty (KD) scores and estimated monthly search volumes.
The KD score ranges from 0 to 100 and is one of the most trusted difficulty measures in the industry. A KD of 0–30 typically means a new site could rank within a few months with solid content. A KD of 60+ usually means you’re competing with high-authority domains.
For a quick difficulty check on a shortlist of keywords, this free tool beats most other options in accuracy.
Pro tip: Enter a broad category term (like „email marketing“) to get 100 related keyword ideas. The difficulty spread across that list quickly shows which subcategories are competitive and which have open opportunities.
Limitation: The free generator shows only the top 100 results and doesn’t include SERP history, backlink data, or click-through rate estimates. All require a paid Ahrefs subscription.
6. Google Trends: Best for Seasonal and Trending Topic Research
Google Trends is genuinely free, requires no account, and gives you something none of the other tools here can: a reliable view of how keyword interest changes over time. You can see whether a keyword is growing, declining, or seasonal, and compare multiple keywords side by side.
The data is shown on a relative scale of 0 to 100 (not absolute search volume), so it tells you how a keyword is trending relative to its own peak. Use it alongside Google Keyword Planner for a full picture: Keyword Planner for volume, Trends for direction.
Regional data is also available, so you can see whether a trend is global or local to a specific country or city.
Pro tip: Compare two competing keyword variations (like „content marketing strategy“ vs. „content strategy“) to decide which term to use in your H1 and title tag.
Limitation: No absolute search volume. The scale is relative to peak, so a trending keyword with a score of 70 might have 50 monthly searches or 50,000; you need another tool to know.
7. AnswerThePublic: Best for Question-Based Content Ideation
AnswerThePublic visualizes the questions, prepositions and comparisons that people search around any keyword. Type in a seed term and you get a visual wheel (or a flat list) of questions like „how to do keyword research for free,“ „what is the best free keyword research tool,“ and „keyword research tool vs. Google Planner.“
This structure is directly useful for planning H2 and H3 headings, FAQ sections and topic clusters. The question categories map closely to how Google structures People Also Ask results.
The free tier allows around three searches per day without an account. The tool was acquired by Neil Patel, and some users report that data quality has shifted since the acquisition. For core question research it still delivers solid results.
Pro tip: Export the full list to CSV and filter the „what“ and „how“ columns first. Those questions usually represent the highest-intent search angles for informational content.
Limitation: The daily free limit is restrictive for regular use. Data quality varies by topic, and some queries return thin results.
8. Moz Keyword Explorer: Best for Organic Difficulty and Priority Scoring
Moz Keyword Explorer is free up to 10 queries per month with no credit card required. It’s the most limited free tier on this list in raw query volume, but what it provides per query is genuinely useful.
The Priority score is what sets Moz apart. It combines monthly search volume, keyword difficulty and organic click-through rate into a single number. A high Priority score means the keyword has meaningful volume, a reasonable difficulty level, and a healthy click-through rate, all at once. Most other tools show these three factors separately and leave you to weigh them manually.
For building a shortlist of SEO keywords worth targeting, the Priority score speeds up the decision considerably.
Pro tip: Search for your target keyword, switch to the „Suggestions“ tab, and sort by Priority score. The top results are your best opportunities in terms of combined volume, difficulty, and click potential.
Limitation: 10 queries per month is very restrictive. Treat this as a validator for a shortlist you’ve already built with other tools, not as your primary research source.
9. Keywords Everywhere: Best for In-SERP Research Without Leaving Google
Keywords Everywhere is a browser extension for Chrome and Firefox that overlays keyword data directly onto Google search results pages, YouTube, Amazon, and other platforms. When you search for anything on Google, the extension shows related keywords, their monthly search volumes, CPC, and competition data in the sidebar, without leaving the search results page.
The free version shows trend sparkline graphs next to search results, which is enough to assess at a glance whether a keyword is growing or declining. Volume data, CPC and competition metrics require purchasing credits, priced at $10 per 100,000 searches.
Pro tip: Even on the free plan, the trend sparklines are a quick signal while you browse Google. A rising trend on a keyword you were already considering is a good confirmation signal.
Limitation: The free tier is limited to trend data only. Volume and competition metrics require paid credits.
10. Keywordtool.io: Best for Platform-Specific and Long-Tail Research
Keywordtool.io generates keyword suggestions by pulling from the autocomplete systems of multiple platforms: Google, YouTube, Bing, Amazon, Instagram, and the App Store. Enter a seed keyword and you get 750 or more keyword suggestions from Google autocomplete alone, all free with no account required.
The long-tail suggestions from autocomplete tend to have lower competition than broader head terms and often carry clear search intent. That makes them particularly useful for content marketers building topic clusters.
The limitation is that the free tier shows only the keyword suggestions themselves. No volume data, difficulty scores or click-through estimates are included. To get those metrics, you need the paid plan starting at $89/month.
Pro tip: Use the YouTube tab to find video keyword opportunities alongside your standard web research. YouTube autocomplete often surfaces different angles on the same topic that work well for written content.
Limitation: No volume or difficulty data on the free tier. Export your suggestions and validate the most promising ones in Google Keyword Planner to check search volume before committing to a topic.
How to Get the Most Out of Free Keyword Research Tools
The biggest mistake with free keyword tools is using one in isolation. Each tool covers a different part of the workflow. Combined, three tools are enough to do solid keyword research at zero cost, whether you’re targeting broad head terms or long-tail keywords with lower competition.
Here’s a three-step workflow that uses only free tools:
Step 1: Find seed keywords in Google Keyword Planner. Start with a broad topic and let Keyword Planner generate hundreds of related ideas. Filter by search volume and competition to build a working list of 20–30 candidates.
Step 2: Check difficulty with Ahrefs Free Keyword Generator. Take your shortlist into the Ahrefs tool and check keyword difficulty scores. Remove anything with a KD above 50 unless you have strong domain authority. You’ll end up with 5–10 realistically targetable keywords.
Step 3: Find content angles with AnswerThePublic or Google Trends. For each remaining keyword, check what questions people ask around it (AnswerThePublic) and whether interest is growing or declining (Google Trends). These two signals tell you what angle your content should take and whether the topic is worth investing in now.
This workflow covers research, validation and angle-finding. That covers the full scope of keyword research at no cost.
Can AI Tools Help with Keyword Research?
AI tools like ChatGPT can genuinely help with one part of keyword research: ideation. Ask ChatGPT to brainstorm keyword variations, related topics, or question angles for a seed term, and you’ll get a solid list of ideas in seconds. It’s fast and often surfaces angles you wouldn’t have thought to search for manually.
What AI tools can’t do is provide accurate search volume data, keyword difficulty scores or SERP analysis. ChatGPT doesn’t know how many people search a keyword per month or how competitive the ranking landscape is. Treat AI-generated keyword lists as raw brainstorming material, then validate each candidate in Google Keyword Planner or another tool with real data.
There’s also a newer angle worth knowing: keyword research for AI search. If your content goal includes ranking in AI Overviews or being cited by tools like ChatGPT or Perplexity, the keyword and topic logic shifts. Search Console now surfaces AI Overview appearances for some accounts, and platforms focused on GEO (generative engine optimization) are emerging to cover this gap. For most sites in 2026, traditional keyword research still drives the bulk of organic traffic, but it’s worth layering in AI search intent for high-priority pages. See our guide to the best SEO AI tools for a broader look at how AI fits into the SEO workflow.
When Should You Upgrade to a Paid Keyword Research Tool?
Upgrade to a paid keyword research tool when you need precise search volume data, full competitor gap analysis, or workflows that scale beyond what free plan daily limits allow. That said, only upgrade when you actually need to. If the free tools in this guide cover your workflow without hitting limits, there’s no reason to pay. Semrush’s free tier gives you 10 searches per day. Ubersuggest gives you 3. Moz Keyword Explorer gives you 10 queries per month. For occasional research, those limits are workable. For a high-volume content operation, they aren’t.
Upgrade when:
- You’re exhausting daily limits mid-session. Hitting Semrush’s 10-search cap or Ubersuggest’s 3-search cap before you’ve finished a single research session means paid is the practical choice.
- You need exact search volumes, not ranges. Google Keyword Planner shows broad ranges (e.g., 1K–10K) for inactive ad accounts. Paid tools like Semrush and Ahrefs give you exact monthly figures.
- You need full competitor keyword gap analysis. Free tools can’t audit a competitor’s entire keyword portfolio or show which keywords they rank for that you don’t. Paid tools offer domain-level keyword gap reports and backlink audits.
- You need rank tracking built into the same tool. None of the tools in this guide include built-in rank tracking on their free plans. If you’re monitoring multiple pages across multiple keywords, that capability requires a paid tier.
- You’re analyzing hundreds of keywords at once. Bulk keyword analysis (running 100+ terms through difficulty scoring and volume checks in one session) isn’t possible on free plans with per-search caps.
If you’re hitting two or more of those situations regularly, a tool like Semrush, Ahrefs or Moz Pro will save more time than it costs. If none apply yet, the free tools in this guide are enough.
Frequently Asked Questions
What is the best completely free keyword research tool?
Google Keyword Planner is the best completely free keyword research tool for most users. It’s built on Google’s own search data, has no daily usage limits, and provides keyword ideas, search volume ranges, competition levels, and CPC estimates. You need a free Google Ads account to access it, but you don’t need to run or pay for any ads.
Is Google Keyword Planner really free to use?
Google Keyword Planner is free to use. You need a Google Ads account, but no ad spend is required. The one limitation is that search volumes appear as broad ranges (like 1K–10K) unless you have an active ad campaign running. Even a minimal campaign spend unlocks exact volume numbers.
What’s the difference between keyword difficulty and search volume?
Search volume is how many times a keyword is searched per month. Keyword difficulty (KD) is a score (usually 0 to 100) that estimates how hard it would be to rank on page one for that keyword based on the strength of pages currently ranking. High volume and low difficulty is the ideal combination, but it’s rare. Most good keyword opportunities involve moderate volume with manageable difficulty.
Can I do keyword research without any tools at all?
You can do basic keyword research without tools by studying Google Autocomplete suggestions, People Also Ask boxes and Related Searches at the bottom of results pages. These are all real signals from Google about what people search. The limitation is that you get no volume data or difficulty scores. For anything beyond casual research, at least Google Keyword Planner is worth adding.
