Keyword density is a descriptive statistic: it tells you how often a word or phrase appears in a piece of text. It can be useful for spotting accidental repetition, but there is no universal keyword percentage you need to hit for a page to rank. Good SEO starts with satisfying the searcher's task and using natural language.
What keyword density actually measures
A simple density calculation is the number of occurrences of a term divided by the number of analyzed words, multiplied by 100. For example, if a phrase appears 8 times in a 1,000-word passage, the simple ratio is 0.8%.
Check text with Tervilo
- Open the Tervilo Keyword Density Checker.
- Paste the content you want to inspect.
- Review frequently repeated terms and phrases.
- Read the surrounding passages before deciding whether anything needs editing.
Why a density number can be misleading
A useful page about “PDF compression” will naturally mention the subject several times. Removing those words simply to make a percentage smaller can make the page less clear. Conversely, repeating a keyword in every heading, paragraph and sentence can make the writing awkward.
Use density as a repetition check
A better workflow is to ask: “Does this sentence need this word?” If the answer is yes, keep it. If several neighboring sentences repeat the same phrase unnecessarily, vary the wording or combine the sentences. The goal is natural clarity, not a predetermined number.
Related terms matter too
Readers often use different words for the same concept. A page about changing PDF size might naturally discuss file size, compression, quality, images and output. Covering useful related concepts can make the explanation more complete without forcing the exact target phrase into every section.
Keyword density is not an SEO score
A high or low percentage does not, by itself, tell you whether the page is helpful. A page can have excellent search intent and useful answers with a low target-term frequency. It can also have a perfectly “balanced” percentage while offering little value.
When to edit
- When one phrase appears so often that the writing becomes distracting.
- When the page uses awkward keyword variations instead of normal language.
- When a term is missing where a reader genuinely needs a clear explanation.
A practical review workflow
- Check the search intent.
- Read the introduction and headings.
- Inspect repeated terms.
- Remove repetition only when it harms clarity.
- Improve explanations and examples before thinking about density.
Quick checklist
- □ The main topic is clear to the reader.
- □ Important terms are used naturally.
- □ Repetition has not been added just to reach a percentage.
- □ Supporting concepts are covered when useful.
- □ Editing decisions are based on readability and completeness.
Quick answer
Use keyword density as a diagnostic for repetitive wording, not as a ranking target. Write for the reader first, use natural terminology, and improve the substance of the page before adjusting the frequency of any keyword.