SEO Content Analyzer
Check keyword placement, headings, sentence length and readability before you publish. 100% free, no signup. Everything runs in your browser.
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This free SEO content analyzer takes your article text, or the raw HTML if you have it, plus your target keyword, and reports the numbers that actually inform an edit: word count, keyword count and density against a sensible 0.5 to 2.5 percent band, whether the keyword appears in the first 100 words, your heading outline when HTML is pasted, average sentence length with the longest sentences listed, Flesch reading ease, paragraph length warnings, and a count of your links. Everything runs in your browser; your draft is never uploaded.
I built this because most content analyzers hand you a single score out of 100 and I think that number is a fiction. No tool knows what your article deserves to rank for, so this one refuses to pretend. Instead you get a pass and warn checklist of specific, fixable things. I use it as a final gate before publishing, usually right after a pass through the readability checker for the deeper style metrics.
How to use
- Paste your article into the text box, either as plain text or as HTML if you want the heading outline checked.
- Enter your target keyword or phrase, the query you actually want the page to rank for.
- Click analyze and read the word count, keyword count and density figure against the suggested band.
- Check the first 100 words test to confirm your keyword appears early, then review the heading outline if you pasted HTML.
- Look through the flagged long sentences and paragraph warnings and decide which ones deserve a rewrite.
- Fix what the checklist marks as warn, paste the revised text and run it once more before publishing.
Why use our seo content analyzer?
The checklist is built on things you can act on. A density figure alone is trivia; a warn flag saying your keyword never appears in the first 100 words is an instruction. Every line in the report maps to a concrete edit: shorten this sentence, split that paragraph, add a heading level you skipped, mention the topic sooner.
I will be straight about keyword density, because most tools are not: it is a sanity check, not a ranking factor to chase. The 0.5 to 2.5 percent band exists to catch the two real failure modes, a page that never commits to its topic and a page that repeats it robotically. Google's guidance on helpful content is clear that writing for people is the goal, and this tool is designed to keep you inside that spirit, not to game anything.
The sentence and paragraph analysis catches what your eyes skip. After three drafts you stop seeing the 60-word sentence in your own introduction. The long-sentence list shows you exactly where readers will stall, and the Flesch reading ease score tells you whether the whole piece drifted more academic than you intended.
Pasting HTML unlocks the structural check. The heading outline reveals skipped levels and sections that sprawl for 800 words without a subheading, which is a scanning problem for readers and a structure problem for search engines. It is the fastest way I know to see an article's skeleton.
Your draft stays yours. Unpublished content is confidential by default, and this analyzer runs entirely in your browser with nothing transmitted or stored. You can analyze a client's embargoed announcement without the awkward question of where that text just went.
Who is this tool for?
Freelance writers run client drafts through it before delivery. Turning in a piece where the keyword placement, structure and readability are already clean means fewer revision rounds, and the checklist gives you a concrete answer when a client asks whether the article is optimized.
Small business owners writing their own service pages use it as a substitute for an SEO consultant they cannot yet justify. The tool will not build a strategy, but it will stop the five most common on-page mistakes from shipping, which is most of what an early-stage site needs.
Content managers use it as a quality gate for guest posts and outsourced articles. Paste the submission, check the density band and the heading outline, glance at the long-sentence list, and you know in one minute whether this draft is close or needs a rework before it enters your CMS.
Bloggers refreshing old posts start here. Paste the old article, see what the checklist flags, tighten the sentences it lists, and check the final word count against the competing pages you are trying to beat. Then finish the job by rewriting the title and description in the meta tag generator.
Frequently asked questions
No. The analysis runs entirely in your browser with JavaScript. Your draft never leaves your machine, which makes the tool safe for embargoed announcements, client work under NDA and anything else unpublished.
Somewhere in the 0.5 to 2.5 percent band, but treat it as a smoke alarm rather than a target. Below the band, check the page actually commits to its topic; above it, read the text aloud and the repetition will announce itself. Never add mentions just to move the number.
Because a single score would be dishonest. Rankings depend on competition, links, intent and site history, none of which a text box can see. A checklist of specific pass and warn items tells you what to fix; a score out of 100 just tells you what to feel.
It is about commitment, for readers first and search engines second. An opening that names its topic quickly confirms the visitor is in the right place. It is one of the strongest signals in the checklist because it correlates with pages that deliver what their title promised.
Most successful marketing and blog content lands between 50 and 70. Technical documentation can run lower without harm. If your general-audience post scores below 40, the long-sentence list will usually show you exactly why, and the text summarizer can help you spot which sentences carry the real weight.
HTML if you can get it, because that enables the heading outline check, one of the most useful parts of the report. Plain text still gives you everything else: counts, density, sentence analysis and readability.
As long as the topic honestly requires. The word count is reported without judgment because the right length for a product update and a definitive guide differ by thousands of words. Look at what currently ranks for your keyword and let that calibrate you, not a universal number.