Free Keyword Density Checker & Analyzer (Instant)

Quick answer: paste text below and get instant keyword density for every 1-, 2-, and 3-word phrase, plus a verdict on your target keyword against the healthy 0.5–2.5% range. Density is a diagnostic, not a dial: 0% means the page never says what it wants to rank for; 3%+ reads as stuffing.

How to use the checker

Paste your page's body copy into the input field and click Analyse. Use body copy only — not a full HTML export. Navigation labels, footer links, and size-guide tables add words that pad the total and make keyword density look lower than it is in the copy a reader actually reads.

The checker calculates:

density % = (keyword occurrences ÷ total word count) × 100

For a 400-word product description where "linen duvet cover" appears six times: (6 ÷ 400) × 100 = 1.5% — inside the natural range.

One edge case worth knowing: on a very short page (under 150 words), even two mentions of a phrase can push density above 2.5%. The signal to act on in that case is the low word count, not the density figure itself.

How to read the numbers

Density does not rank pages — but it exposes two failure modes fast. If your target phrase sits at 0%, the page cannot rank for it: search engines still need the words to appear where they carry weight (title, H1, early body copy). If it sits above 2.5% — the point at which the checker above stops calling it healthy — and the top-phrases table is one phrase repeated with minor variations, the copy was written for a crawler from 2009, and modern engines treat it as spam.

The more useful signal is the 2- and 3-word phrase tables. They show what the page is actually about, statistically. A product page for a linen duvet cover whose top phrases are "free shipping", "add to cart", and "sign up" has a content problem no single-keyword count reveals — the selling copy is thinner than the interface chrome around it.

Practical rule: If your top bigrams are interface strings like "add to cart" or "free returns", the fix is more product copy, not keyword insertion.

Density ranges at a glance

Practical rule: Run the checker on a competitor's best-ranking page first so you know what natural density looks like for that specific query.

Applying the results in Shopify

Keyword placement problems in Shopify almost always sit in one of four editable fields:

• Product description — Online Store > Products > [product] > Description
• Collection description — Online Store > Collections > [collection] > Description
• Page body — Online Store > Pages > [page]
• Blog post body — Online Store > Blog posts > [post]

Title tags and meta descriptions are separate fields — density analysis covers body copy only. For title and meta placement, use RankEngine's free SEO title generator and meta description generator directly. For collection pages in particular, the collection page SEO guide covers how to write descriptions that carry keyword weight without reading as a bare category label.

What to do with the result

Put the keyword in the title, H1, and first 100 words; keep body copy natural; and let related phrases (material, size, use case) carry the rest of the relevance. The Shopify SEO guide covers where each signal lives in a Shopify theme, and RankEngine's audit checks keyword placement across every product in the store at once — including the pages you forgot exist.

Practical rule: Prioritise the 10 product pages that already get the most organic clicks — a content fix there has the biggest revenue surface.