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Free Keyword Checker — Density, Phrases, Flagged Words

Paste any draft and instantly see keyword density, top phrases, readability, and any banned words you need to flag — runs entirely in your browser, no upload, no sign-up.

Runs offline in your browserWorks in English and ChineseInstant — no model download
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How to Check Keywords and Density

1

Paste your text

Drop in a video description, blog post, ad copy or any draft. The analyzer handles English, Chinese and most Latin-script languages.

2

Inspect keywords and density

Top keywords and two-word phrases are ranked by frequency, with density bars and a readability score so you can spot stuffing and over-long sentences.

3

Flag risky words

Optionally paste your platform's banned-word list. Every occurrence is highlighted with the surrounding sentence.

Frequently Asked Questions

Is the keyword checker free?

Yes — 100% free, no sign-up, no limits. The entire analysis runs locally in your browser; nothing is sent to a server.

Which languages are supported?

English and Chinese are first-class. Other Latin-script languages (Spanish, French, German, etc.) work for word counting and density. For Chinese, Japanese and Korean we use character-level bigrams since they have no word boundaries.

Does it use AI?

The core analysis (density, phrases, readability, exact flagged-word matching) is pure JavaScript — fast, private, offline. There's also an optional "AI multilingual check" button that translates non-English text to English server-side, so the TikTok flagged-word list can be applied across 100+ languages. The AI check is free for 5 calls per day, then requires AFT Pro; the regular analysis stays unlimited and offline.

What counts as a flagged word?

We ship a small starter list of commonly-flagged marketing claims (e.g. "guaranteed", "miracle"). Replace it with your platform's actual banned-word list for accurate compliance checking.

What is Flesch Reading Ease?

A 0–100 score for English text — higher is easier to read. 60–70 is plain English; below 30 is academic-level. We only compute it for predominantly Latin-script input of 30 words or more.

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