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Free AI Humanizer — Make Flat Drafts Read Naturally

Paste up to 2,000 characters of a draft that reads stiff or generic. Our rule-based rewriter varies the rhythm, simplifies the word choice, and cuts the filler — so the writing sounds like a person wrote it.

RULE-BASED · EM DASHES STRIPPED · DETERMINISTIC0 / 2,000
Strength

Recommended

Personality

How to use this tool

  1. 1

    Paste your draft (max 2,000 characters per run).

  2. 2

    Pick a strength (low / medium / high) and personality (casual / confident / analytical / balanced).

  3. 3

    Click 'Humanize' — the rewrite runs in your browser request, no LLM call.

  4. 4

    Read the result and edit from there, or run it again with a different personality.

Why this tool exists

Generated drafts tend to share the same texture: heavy em dashes, predictable transitions ('Furthermore', 'Additionally', 'Moreover'), uniform sentence length, sophisticated vocabulary where simple words would do, and an absence of contractions or hedges. The result is prose that is grammatical and dull.

A rule-based rewriter fixes those patterns directly instead of generating new text. That has two big advantages over LLM-based rewriters: it's deterministic (you can re-run it and get the same output) and it can't hallucinate facts into your writing. The trade-off is that it's most effective on shorter passages where the structural changes have visible impact.

The full in-app rewriter in Cereby pairs this rule pipeline with an LLM rescue mode for paragraphs that resist rule-based rewriting. This free tool gives you the rule pipeline only — which on its own handles the bulk of common problems and is plenty for tightening a paragraph or two.

It is a style tool. It improves how writing reads; it does not make unoriginal work original, and it is not a way around your school's or publisher's rules on disclosing AI assistance. Follow those rules.

When you'd use this

  • Polishing a draft that came out sounding too generic
  • Cutting over-used transitions like 'Furthermore' and 'Moreover'
  • Breaking up uniform sentence length that reads monotonously
  • Loosening prose that is more formal than the piece needs

Frequently asked

Is this an LLM-based rewriter?
No. This is the same rule-based JavaScript pipeline Cereby uses for its core rewriting — no external LLM, no API call to a third-party model. It runs deterministically and is 100% transparent: same input + settings = same output.
Does it remove em dashes?
Yes. Em dashes are heavily over-used in generated drafts, so the final polish step replaces them with the punctuation the sentence actually calls for — a period or a comma, depending on context.
Why is it limited to 2,000 characters?
The free tool exists to give you a useful taste. The full in-app rewriter accepts up to 50,000 characters per run and supports a deeper rewrite mode that calls an LLM rescue model on passages the rules cannot improve — all in your Cereby account.
What does 'strength' control?
Low runs only the core transforms (transition reduction, formality reduction, contractions, conversational markers). Medium adds context-aware swaps, sentence rhythm variation, and final polish. High enables sentence restructuring, rhetorical question injection, and a second subtractive pass.
What does 'personality' control?
It biases the inserted hedges, openers, and word choice toward casual (informal, contraction-heavy), confident (assertive, direct), analytical (measured, precise), or balanced (a weighted mix).
Will this make my writing good?
It fixes mechanical problems — monotonous rhythm, filler transitions, needless formality — and it cannot fix a weak argument or add an idea you did not have. Treat the output as a draft to edit, not a finished piece. It is a rewriting aid, not a substitute for doing the work or for citing sources you relied on.

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