How to Do Keyword Research for Affiliate Marketing (Free Tools Only)
June 2, 2026 · ProftVault
Most beginners skip keyword research entirely. They write about whatever sounds interesting, publish it, and wonder why nobody shows up. That’s why their content never ranks — and never earns. The good news: you can do proper keyword research for affiliate marketing in about 30 minutes using only free tools. No Ahrefs subscription. No SEMrush trial. Here’s exactly how.
If you’re still figuring out the basics, our affiliate marketing for beginners complete guide covers the full system from scratch. But if you’re ready to write content that actually gets found on Google, this post is your starting point.
Why Keyword Research Matters for Affiliate Marketing
Before you write a single word, you need to know someone is actually searching for it. Keyword research isn’t busywork — it’s the difference between content that earns and content that sits there. Here’s why it matters so much for affiliates specifically.
Write what people are searching for — not what you think they want
Your opinion about what’s interesting doesn’t matter to Google. What matters is what people are actually typing into the search bar. Keyword research flips your content strategy from “I want to write about this” to “here’s what 2,000 people searched for last month — let me answer that.” That shift alone can double or triple your organic traffic. It’s how you write affiliate marketing content that converts.
Low competition = faster rankings = faster commissions
Targeting the right keywords — low competition, decent volume — is how beginners rank quickly without a domain authority of 50+. A beginner site targeting “best protein powder” will never beat Healthline. But a beginner site targeting “best protein powder for women over 40 with thyroid issues” might rank on page one within 60 days. Low competition is your leverage as a new site.
One good keyword can drive 500+ visitors/month for years
Unlike social media posts that die in 48 hours, a well-ranked blog post keeps sending traffic month after month — often for years. One post targeting the right keyword can quietly earn commissions while you sleep. That’s the compounding power of SEO-first affiliate marketing. It’s also one of the reasons building an affiliate blog beats most other free traffic strategies in the long run.
The 3 Types of Keywords You Need
Not all keywords are equal. Different keyword types attract visitors at different stages of the buying journey — and your content strategy needs all three. When you start affiliate marketing with no audience, this is the framework that builds momentum fastest.
Informational Keywords
Example: “how to start affiliate marketing”
These are top-of-funnel searches from people just discovering the topic. They’re not ready to buy yet — they’re learning. Informational posts build your site’s authority, bring in the most traffic, and warm readers up for your bottom-funnel content. Start with these when your site is new. They’re the easiest to rank for and create the audience you’ll monetize later.
Comparison Keywords
Example: “ClickBank vs ShareASale for beginners”
Mid-funnel searches with high buyer intent. Someone typing a comparison query already knows both options exist — they just need help deciding. These posts convert because the reader is one step from a decision. They’re also easier to rank than broad informational terms because they’re more specific. A perfect content type once you have 5–10 informational posts published.
Best-of / Review Keywords
Example: “best affiliate programs for beginners 2026”
Bottom-of-funnel, highest commission potential. People searching “best [X]” are ready to act. They want a recommendation. Your job is to give them one — and make it your affiliate link. These posts are where most affiliate commissions actually come from. The best niches for affiliate marketing are full of “best of” keywords that convert at 3x the rate of informational posts.
5 Free Tools That Actually Work
You don’t need to spend a dollar on keyword research tools when you’re starting out. These five tools give you everything you need to find, validate, and prioritize keywords — completely free.
Google Search
Free. Zero signup. More powerful than most people realize. Google’s autocomplete shows you exactly what real people are typing right now. “People Also Ask” boxes reveal the follow-up questions your post should answer. “Related Searches” at the bottom of the SERP is a goldmine for related keyword variations. Spend 10 minutes here before touching any other tool — you’ll have 20 keyword ideas before you open a second tab.
Google Keyword Planner
Free with a Google account (no ad spend required). The only tool that gives you search volume estimates straight from Google’s own data. Type in a keyword, and you get monthly search volume ranges and a competition gauge (low / medium / high). It won’t give you exact numbers on the free tier, but ranges like “1K–10K” are enough to prioritize your content calendar. This is the tool that validates ideas you find in Google Search.
Ubersuggest Free Tier
3 free searches per day — use them wisely. Ubersuggest shows CPC (cost-per-click), SEO difficulty score, and related keyword suggestions in a clean interface that’s beginner- friendly. The CPC data is particularly useful for affiliates: high CPC = advertisers are paying good money to be on this keyword = buyers are on this page. A keyword with $2+ CPC is almost always worth targeting.
Answer The Public Free Tier
Type in a seed keyword and Answer The Public maps out every question people ask around it — “how,” “what,” “why,” “when,” “which,” comparisons, and prepositions. It’s one of the best tools for generating blog post ideas because every result is a question someone is genuinely asking. A single search on “affiliate marketing” will give you 30+ post ideas. The free tier limits daily searches, so treat each one like it counts.
Keywords Everywhere Chrome Extension (Free Tier)
Install once and it runs quietly in the background. As you browse Google results, Keywords Everywhere shows “Related Keywords” and “People Also Search For” in a sidebar panel. The free tier removed volume data, but the keyword suggestion features remain free and genuinely useful. It’s the best passive keyword research tool because it works without you having to open a separate tool — just search Google like normal and let it surface ideas.
Step-by-Step: Find a Keyword in 20 Minutes
Here’s the exact workflow to go from a blank page to a validated keyword you can build a post around — using only the free tools above. This is the same process behind every post that drives traffic on a new affiliate site. It also feeds directly into how to get your first 100 visitors to your blog.
Start with your niche seed term
Open a blank doc and write down your niche in 2–4 words. For example: “affiliate marketing for beginners.” This is your seed term — the root keyword you’ll branch out from. Don’t overthink it. The seed term is just the starting point, not the keyword you’ll target. If you’re still working out your niche, our guide on how to build an affiliate marketing website covers niche selection step by step.
Type it into Google — grab autocomplete + PAA
Type your seed term into Google (don’t press enter yet). Write down 3 autocomplete suggestions that look interesting. Then press enter and scroll to the “People Also Ask” box — write down 3–4 questions. Scroll to the bottom and grab 3–5 “Related Searches.” You now have 10+ keyword variations in under 5 minutes without opening a single tool.
Run the top suggestion through Google Keyword Planner
Pick your most interesting keyword from Step 2 and paste it into Google Keyword Planner. Look for two things: monthly searches in the 1K–10K range (big enough to matter, small enough to rank), and competition set to “Low.” If the keyword shows “High” competition, move to the next one on your list. You want the intersection of real search volume and low advertiser competition — that’s where beginners win.
Check the SERP — can you compete?
Search the keyword in Google and look at the top 3 results. If you see forums (Quora, Reddit), low-DA blogs, or thin listicles on the first page — you can compete. If the top 3 results are Forbes, HubSpot, and NerdWallet — skip it. Look for SERPs where the top results feel like they were written by people at your level. That’s your opening.
Write the post targeting that exact keyword
Put the keyword in: (1) your post title, (2) your first paragraph, and (3) at least one H2 heading. That’s the minimum on-page SEO that tells Google what your post is about. Don’t stuff it in every paragraph — write naturally and use it where it fits. Our guide on how to write affiliate marketing content that converts covers the rest of the on-page strategy.
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Get the Affiliate Jumpstart → $17What to Look for in a Good Keyword
Not every keyword that shows up in your research is worth targeting. Here are the four signals that tell you a keyword is worth building a post around — especially when you’re early and every post has to count.
Searches per month: 500–5,000 (sweet spot for beginners)
Anything under 500 searches/month might not be worth the time investment — even if you rank #1, the traffic is too thin. Anything over 5,000 is likely too competitive for a new site. The 500–5,000 range is where beginners find the best balance: enough traffic to matter, low enough competition to actually rank. Once you have 20+ posts live and some domain authority, you can start targeting the higher end.
Competition: low to medium only
High competition means established sites with thousands of backlinks are already ranking for this keyword. Trying to outrank them as a new site is a 12–18 month project at minimum. Stick to low and medium competition keywords for your first 6 months. You’ll rank faster, build confidence, and accumulate the domain authority you need to eventually go after harder terms.
Commercial intent signal: CPC > $0.50
CPC (cost-per-click) is the amount advertisers pay Google every time someone clicks their ad on a keyword. A CPC above $0.50 means advertisers are willing to pay to be on this page — which means the people searching it have purchasing intent. Keywords with $2+ CPC (visible in Ubersuggest) often drive affiliate commissions at 2–3x the rate of low-CPC informational terms. It’s one of the clearest free signals that a keyword is commercially valuable.
Trending up, not down
Before committing to a keyword, run it through Google Trends ( free, no signup). If the trend line has been declining for 12+ months, the topic is losing relevance — not worth building evergreen content around. You want a flat or upward trend, which confirms the search volume you see in Keyword Planner isn’t a seasonal spike that’s already passed.
3 Keyword Mistakes Beginners Make
Even with the right tools, these three mistakes will undo everything. They’re common, easy to make, and kill rankings before a post has a chance to perform.
Targeting high-volume, high-competition terms
Typing “make money online” into Google returns roughly 100 million results. Every major media outlet, every established blog, every YouTube channel in the space has a page optimized for that term. A new site targeting it will not rank — ever. The mistake is treating high search volume as the primary goal. Volume without a realistic chance of ranking is worthless. Always check competition before getting excited about a number.
Writing content without a target keyword
This is the most common beginner mistake. You write a great post, publish it, and wait for traffic that never comes. The problem: Google has no idea what to rank you for. If there’s no clear target keyword in your title, first paragraph, and headings, Google will make its best guess — and it’s usually wrong. Every post needs one primary keyword it’s explicitly targeting. One post, one keyword. That’s the rule.
Keyword stuffing
Repeating your target keyword in every paragraph doesn’t help — it hurts. Google’s algorithm has understood natural language since at least 2019. Stuffing keywords reads as spam to the algorithm and as unreadable to humans. Visitors bounce immediately, which sends a negative signal back to Google and tanks your rankings. Use your keyword naturally — title, intro, one H2, and a couple of times throughout where it fits organically. That’s it.
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