Sentence Rewriter
Get multiple heuristic rewrites of any sentence. 7 tone presets (formal / casual / concise / expanded / persuasive / passive / active), curated synonym thesaurus, single-sentence and whole-text modes. 100% private.
What is the Sentence Rewriter?
Sentence Rewriter applies rule-based transformations plus a curated synonym thesaurus to generate multiple variations of a sentence. Seven tone presets cover the workhorse rewriting moves: more formal (expand contractions, replace casual fillers), more casual (add contractions, switch transitions), more concise (drop filler phrases like 'in order to' and 'due to the fact that'), more descriptive (add transitions and qualifiers), more persuasive (switch to active verbs, address the reader as 'you'), passive voice (convert active subjects into passive constructions), and active voice (detect passive markers and rewrite). Synonym swaps draw from a ~150-entry curated thesaurus organised across verbs, adjectives and adverbs — small enough that substitutions stay grounded, broad enough to surface real alternatives. Two modes: 'single sentence' produces up to 8 variations of one input; 'whole text' splits a paragraph into sentences and rewrites each. Pure functions, no LLM call.
How to use it
- Pick a mode: Single sentence (8 variations) or Whole text (each sentence rewritten).
- Paste your sentence or paragraph.
- Choose a tone preset and how many variations you want per sentence (2-8).
- Pick the rewrite you like, copy it, or download all the variations as .txt.
Benefits
- Seven tone presets covering formal / casual / concise / expanded / persuasive / passive / active.
- Curated 150-entry synonym thesaurus across verbs, adjectives and adverbs.
- Single-sentence mode produces up to 8 distinct variations per input.
- Whole-text mode splits paragraphs and rewrites each sentence with its own variation set.
- Concise mode strips well-known filler phrases ('in order to', 'due to the fact that').
- Active ↔ passive voice conversion handles the simplest verb patterns automatically.
- Casual mode adds contractions; formal mode expands them — pick once, get both.
- Runs 100% in your browser — no LLM call, no API key, no upload.
Frequently asked questions
Is this an AI rewriter?
No — it's a heuristic, rule-based pass. We apply tone transformations and synonym swaps without calling any LLM. That keeps the tool offline, private and free, but the variations are less creative than what GPT-4 / Claude can produce.
Will the meaning stay the same?
Mostly — but always re-read. Some synonym swaps subtly shift meaning ('utilise' has a slightly more formal connotation than 'use'). Voice changes especially can move emphasis. Treat the output as drafts.
How does passive ↔ active work?
Passive mode looks for 'Subject verb object' patterns with a small allowlist of verbs (built, made, created, designed, …) and converts to 'Object was verb-ed by subject'. Active mode reverses 'X was Y by Z' → 'Z Y X'. Complex sentences may fall back to the original.
What does 'concise' mode drop?
Filler phrases: 'in order to' → 'to', 'due to the fact that' → 'because', 'at this point in time' → 'now', 'just', 'actually', 'basically', 'very', 'really', 'quite'. The list is curated, not generative.
How many variations do I get?
Two to eight per sentence in single-sentence mode (your choice). Whole-text mode applies the same per-sentence count across the paragraph.
Will the rewrites all be different?
Each one applies the same tone but a different synonym-swap intensity, so you'll see graduated variations. Sometimes two variations may be identical if no synonyms apply — we dedupe and you'll see the actual unique count.
Does it work on non-English text?
The thesaurus is English-only, but the structural transformations (contractions, voice) are tied to English grammar too. For other languages, the output will mostly pass through unchanged.
Will my rewrites be stored?
Only your last input and tone choice persist in localStorage on this device. The rewrites themselves live only in page state.
Why is the AI Text Humanizer separate?
Different job. Sentence Rewriter produces alternatives of the SAME sentence with varying tone. AI Text Humanizer takes AI-style prose and breaks the telltale LLM patterns (stiff transitions, em-dash abuse, tricolons). Use rewriter for drafting, humanizer for cleaning up AI output.
Will it help with academic writing?
Use the formal tone for tightening. Be careful with the synonym thesaurus — academic vocabulary is field-specific and our generic swaps may not preserve discipline-specific connotations.
Is anything uploaded?
No. Rewriting runs entirely in your browser.