For on-page SEO, place your primary keyword in the highest-impact spots: the title tag (ideally near the front), the H1 heading, the opening paragraph within roughly the first 100 words, at least one subheading (H2 or H3), the meta description, and, where it reads naturally, the URL slug and image alt text. Those anchor placements help both readers and search engines confirm the page’s topic quickly. Beyond them, write naturally — Google’s language models understand context, so a keyword mid-sentence is recognised just as well as one in first position, and cramming the keyword everywhere reads as keyword stuffing. AnyTool’s Content Optimizer checks each of these placements and flags the ones you are missing with a concrete fix.

There is no ideal word count for SEO. Google’s John Mueller has stated directly that word count is not a ranking factor; studies that show first-page results averaging well over a thousand words reflect correlation, not causation — comprehensive content that fully answers a query simply tends to be longer. So let the intent decide: a definition or quick answer may be a few hundred words, while a competitive, in-depth guide often runs 1,000–2,000+ words because it needs to cover more. AnyTool’s Content Optimizer uses a soft band (flagging very thin copy and noting when long-form is fine if the topic warrants it) but is explicit that this is guidance, not a target to pad toward. Focus on covering the topic thoroughly and usefully rather than hitting a number.

A good score in a content optimizer means your on-page fundamentals are in place: the keyword sits in the title, H1, intro, a subheading, the meta and the URL; density is natural rather than stuffed; the length suits the intent; the copy reads clearly (often around an 8th-grade level for broad audiences); and the page has a clear heading structure. Treat a high score as “the on-page basics are covered”, then put your energy into genuinely useful, original content. It is not a ranking prediction: the tool only analyses the copy you paste and cannot see the off-page factors Google actually weighs — backlinks and domain authority, overall site quality and speed, freshness, how well you match search intent, and real user engagement signals. So use the score to self-edit, not as a guarantee.

The Content Optimizer is 100% client-side: the content, keyword, title, meta and URL you enter are analysed with ordinary JavaScript on your device — nothing is fetched, uploaded, logged or stored on a server, and no CDN is called for processing. That makes it safe for scoring unpublished articles, client copy and confidential content without exposing them. It scores as you type, groups the checklist by theme (placement, density, length, readability, structure), shows a 0–100 gauge with a letter grade, lists priority-ordered fixes and offers a copyable report; it works offline once cached as a PWA, supports dark mode and a mobile layout with a sticky Sample / Copy bar. The logic is a small pure engine (contentOptimizeEngine.ts) that reuses the shared keywordDensityEngine and textStatsEngine with no new dependency — everything runs locally in your browser.