TF*IDF Tool
Optimize content relevancy metrics
Optimize your content for search engines by analyzing keyword density. Enter up to 10 URLs to analyze multiple pages at once and improve your SEO strategy.
Start Analyzing NowInput up to 10 URLs of the web pages you want to analyze for keyword density. Our tool will fetch and process the content of each page.
Our advanced algorithm analyzes the content, identifying and counting individual words and phrases to determine their frequency and density.
Receive detailed reports for each URL, showing keyword density percentages, top keywords, and suggestions for optimizing your content for better SEO performance.
See exactly how many times each keyword appears and what percentage of your total word count it represents.
Compare your keyword usage against top-ranking pages for the same query — not just your own density in isolation.
Spots over-optimization before Google does. If a term appears 47 times in 1,200 words, you'll know.
Analyzes the full page including headings, meta description, and alt text — not just body paragraphs.
Works on any public URL. Paste a competitor's page to see their keyword focus and find gaps in yours.
Results in seconds, no signup required. Check density during your writing process, not after publishing.
At its simplest, keyword density is a formula: (keyword count / total words) × 100. A page with 1,000 words that mentions "seo audit" 10 times has a 1% keyword density. Simple enough. But simple is also misleading.
Consider this: 2% density on a 300-word page means 6 mentions. That same 2% on a 3,000-word page means 60 mentions. Both are "2%," but they read completely differently. On a short page, 6 mentions of the same phrase is noticeable. On a long-form guide, 60 mentions might be spread naturally across subheadings, examples, and analysis — or it might feel like the author is being paid per keyword. The raw percentage doesn't tell you which.
This is why the SEO industry moved past simple density years ago. The progression went roughly like this: keyword density (count occurrences) → TF-IDF (compare frequency against a corpus of documents to measure term importance) → semantic analysis (understand meaning, not just matching strings). Google's algorithms — particularly BERT, MUM, and the helpful content system — don't count how many times you said "best running shoes." They understand whether your page actually covers the topic of running shoes in a way that helps someone.
So does keyword density still matter? Yes, but not in the way most people think. It's a diagnostic signal, not a target. The right question isn't "what density should I aim for?" It's "am I naturally using the terms my audience actually searches for?" If you write a 2,000-word guide about running shoes and never mention "running shoes," something is off. If you mention it 80 times, something is also off. Density helps you spot both extremes.
What this tool does differently from a basic word counter: it compares your keyword density against top-ranking pages for similar content. Instead of telling you "your density is 1.4%" and leaving you to guess whether that's good or bad, it shows you where you stand relative to pages that are actually performing in search results. That context is what makes density useful again.
There's no magic number. Anyone claiming "2.5% is the optimal keyword density" is making it up. Google has never published a target density, and internal studies from major SEO platforms consistently show that top-ranking pages vary wildly — from 0.5% to 3% for their primary keyword. The pages that rank well do so because of content quality, backlinks, and user satisfaction, not because they hit a specific percentage.
Write for humans first, then check density as a diagnostic. Finish your draft. Make it useful, clear, and complete. Then run the density check. If your target keyword barely appears, you probably drifted off-topic or used too many synonyms without anchoring the core term. If it's everywhere, you were probably optimizing while writing instead of just writing.
Watch for keyword stuffing signals. If your density exceeds 3-4% for any single term, read the content aloud. Does it sound forced? Do you notice the same phrase appearing in every other sentence? That's what Google's helpful content system flags. The penalty isn't for a specific number — it's for content that clearly prioritizes search engines over readers.
Use semantic variants. Google understands that "running shoes," "best shoes for running," and "top-rated running footwear" target the same intent. You don't need to repeat the exact-match phrase over and over. Natural variation in how you reference the topic is both better for readers and better for rankings. Our analyzer groups these variants so you can see your effective coverage, not just exact-match counts.
Check what competitors are doing. If the top 5 pages for your target keyword average 1.5% density and you're at 0.3%, you might be under-optimized — not because 1.5% is magic, but because those pages are covering the topic more thoroughly than yours. Conversely, if you're at 4% and they're at 1%, you're probably overdoing it. Context from real SERPs beats any generic rule.
Keyword density refers to the number of times a specific keyword or phrase appears on a web page compared to the total number of words on that page. It's expressed as a percentage and is an important factor in SEO.
Paste up to 10 URLs. The tool fetches each page's content, strips HTML, and counts every word and phrase. It calculates frequency and density as a percentage, then shows the results sorted by most common keywords.
There's no universally ideal keyword density, but a general rule of thumb is to aim for 1-3%. However, it's more important to focus on creating high-quality, natural-sounding content rather than hitting a specific keyword density target.
Use the results to identify overused or underused keywords, ensure a good balance of important terms, and discover new keyword opportunities. This can help you refine your content strategy and improve your search engine rankings.
There's no universal target. The pages that rank well for a given keyword can have densities ranging from 0.5% to 3% — the percentage alone doesn't determine rankings. Instead of aiming for a specific number, compare your density against pages that actually rank well for your target keyword. If you're significantly lower or higher than the competition, that's a signal worth investigating. This tool does that comparison automatically so you get context, not just a raw percentage.
Yes. Google's helpful content system specifically targets pages that over-optimize for keywords at the expense of readability. The threshold isn't a fixed number — it's about whether the content reads naturally or feels like it was written for a search engine. If you read your page aloud and the same phrase keeps jumping out unnaturally, that's the signal. Reduce the density, use synonyms, and focus on actually answering the searcher's question.
Keyword density counts how often a term appears on your page relative to total words — it's a single-page metric. TF-IDF (Term Frequency-Inverse Document Frequency) goes further: it compares that frequency against a collection of documents to determine how important or unique a term is to your content. A word like "the" might have high density but low TF-IDF because it appears everywhere. A word like "programmatic SEO" might have low density but high TF-IDF because it's distinctive to your topic. Our analyzer uses both approaches to give you a more complete picture.