Keyword Density Checker
Use this free online Keyword Density Checker to analyse any block of text for its most common single-word, two-word and three-word phrases. It is useful for SEO writers checking whether a target keyword has been mentioned often enough, content editors spotting accidental over-optimisation, copywriters finding repetitive phrasing in their drafts, and bloggers planning meta descriptions. Paste your article into the box and the tool returns ranked tables of unigrams, bigrams and trigrams with their raw frequency and the percentage they represent of the total content. Common stopwords are filtered out automatically. Runs entirely in your browser, no sign-up required.
How to Use This Keyword Density Checker
Checking keyword density is a one-click workflow.
- Paste your article or web copy into the input area.
- Click Analyse and wait a moment for the three frequency tables.
- Review the unigram (single word) table to spot dominant terms.
- Review the bigram and trigram tables for natural-sounding key phrases.
- Adjust your draft if any term feels stuffed (over 3-4% density) or absent.
How This Keyword Density Checker Works
Keyword density is the percentage a given word or phrase represents of the total visible word count of a page. Search engines use it as one signal among hundreds when judging what a page is about, but exact-match repetition has not been a strong ranking factor since the early 2010s — Google now uses semantic models that understand related terms. The calculator tokenises your text into words by splitting on whitespace and removing punctuation, then filters out a list of common English stopwords ('the', 'and', 'of', 'in') so the analysis surfaces meaningful terms. It generates three tables: unigrams (single words), bigrams (adjacent two-word phrases) and trigrams (adjacent three-word phrases). Each table is sorted by frequency and includes the percentage relative to the total word count. A density of 1-2% for the primary keyword is the usual recommendation; 3% or higher is the upper limit before the text starts reading awkwardly. The bigrams and trigrams are often more useful than the unigrams because they reveal natural phrases worth working into headings and meta descriptions. All processing happens locally in your browser, so even unpublished drafts can be analysed safely.
Last updated: May 2026.
Frequently Asked Questions
What is a good keyword density?
1–2% for a primary keyword is a common guideline, but write for readers first. Above 3–4% looks like keyword stuffing.
What are stopwords?
Common, low-meaning words like "the", "and", "of", "is". They appear so often that ignoring them makes keyword analysis more useful.
Why use 2-grams or 3-grams?
Multi-word phrases ("free online tools", "image background remover") map closer to real search queries than single words. They reveal long-tail keyword opportunities.
Does keyword density still matter for SEO?
Less directly than it used to. Modern search engines understand topical relevance via embeddings. Density is now more of a sanity check than a target.
Can I analyse multiple pages at once?
Not in this tool — paste one page at a time. For site-wide analysis you'd use crawling tools like Screaming Frog or Ahrefs.