Content Optimizer

Paste an article and a target keyword. You get word and sentence counts, keyword density, headings, a Flesch readability score, and a score out of 100 with clear fixes. Everything runs in your browser — your text is not uploaded to a server.

What this tool does — and does not do. It checks the structure of the text you paste: length, headings, keyword use and readability. It does not fetch competitor pages, it does not know Google rankings, and its score is a content-structure guide, not a ranking guarantee.

Target keyword or phrase (required) Target word count Article text (required)

How the score is worked out

The score is the sum of six checks, 100 points in total. Nothing is guessed: each check shows its points.

Word count vs target — 20 points. Full points at or above your target, half points at half the target or more.
Keyword density 0.5%–2.5% — 20 points. Density is keyword uses ÷ total words × 100. Half points just outside that band.
Keyword in the first paragraph — 15 points.
Headings: 1 H1 and at least 1 H2 — 15 points.
Average sentence length, 20 words or less — 15 points.
Readability: Flesch 60 or higher — 15 points. Flesch Reading Ease = 206.835 − 1.015 × (words ÷ sentences) − 84.6 × (syllables ÷ words). A syllable is counted as a group of vowels in a word, minus a trailing silent “e”, with at least 1 per word.

Plain-text headings: a short line (3–80 characters, at most 12 words, no full stop at the end) followed by a blank line counts as a heading — the first one as H1, later ones as H2. In pasted HTML, headings are counted from the H1, H2 and H3 tags.

What is checked

Length — words, sentences, paragraphs, average sentence length and average words per paragraph.
Keyword use — exact phrase, case-insensitive; uses, density, in the first 100 words, in the first paragraph, and in a heading.
Headings — how many H1, H2 and H3 headings the text has.
Readability — Flesch Reading Ease, its plain-English band, and a grade estimate (an estimate from the Flesch score, not a measurement of the reader).

Text under 50 words is still analysed, with a note that the averages and readability score are only a rough guide at that length.