AI Paraphraser
Commercial use OK
380+ models
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Model:
+ GPT-5, Claude, Gemini
Original
Paraphrased
Advanced options
Result
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Paraphrase text with AI for free. Multiple rewriting modes.
How to Use AI Paraphraser
1
Enter your input
Type text, upload a file, or describe what you want. No account needed.
2
Click generate
Our AI processes your request in seconds using the best open-source models.
3
Download & share
Download, copy, or share your result. Free for personal and commercial use.
Use this tool via API
Automate this tool from your own code. OpenAI-compatible REST endpoint, Bearer-token auth, no extra SDK required. Token costs match the web interface.
curl -X POST https://api.free.ai/v1/chat/ \
-H "Authorization: Bearer sk-free-..." \
-H "Content-Type: application/json" \
-d '{"model": "qwen7b", "messages": [{"role": "user", "content": "Summarize this: ..."}]}'Related Free AI Tools
AI Paraphraser — FAQ
Free.ai Paraphraser rewrites any text while preserving meaning, facts, numbers, and citations. Pick one of 8 modes (Standard / Fluency / Formal / Academic / Simple / Creative / Shorten / Expand), a synonym strength from 1–4, and up to 5 distinct variations. A word-level diff view highlights exactly what changed. One-click chain buttons send the result to Humanizer, AI Detector, or Grammar Checker.
QuillBot charges $9.95/mo for premium modes and caps free use at 125 words. WordAi is $27/mo. Spinbot is free but uses naive synonym spinning that reads like broken English. Hypotenuse starts at $29/mo. Free.ai runs on our own GPUs inside a daily token pool — no monthly subscription, no per-word caps (up to 5,000 words per run), and modes are tuned with explicit hard rules (no invented facts, citations preserved verbatim, academic register uses real hedge words).
Honest answer: detector-bypass is not a real product feature. Turnitin's AI detector looks at perplexity and burstiness patterns that persist across most paraphrasing. Even dedicated "humanizers" (Undetectable.ai, StealthGPT) lose detection rates when Turnitin updates. For legitimate use cases (non-native-English polishing, reducing plagiarism risk against an existing source), paraphrasing works well. For gaming a detector, use our AI Humanizer tool — but read the honest caveat there too.
Strength 1 replaces only obvious repetitive words and keeps sentence structure identical — smallest diff, safest for academic work. Strength 2 swaps ~30–50% of non-trivial words with light structure variation (default). Strength 3 replaces most non-trivial words and restructures sentences throughout. Strength 4 maximizes lexical diversity and aims for near-zero 4-gram overlap with the source — use only when the source is not your own writing and you want a genuine rewrite.
Fluency mode changes as little as possible — it fixes grammar and polishes phrasing but keeps your sentence structure. Best for non-native writers who want their voice preserved. Standard mode does a balanced rewrite — same meaning, new phrasing, similar length. Use Standard when you want a genuinely different version; use Fluency when you want the result to still sound like you.
Yes — the system prompt explicitly instructs the model to preserve every citation verbatim (APA, MLA, Chicago, Vancouver, footnote markers). Academic mode adds scholarly register (hedge words, Latinate vocabulary, occasional passive voice) but doesn't touch your reference markers or the quoted material inside them. Always run a manual pass on complex citations — no AI is perfect with nested brackets.
One variation is usually enough for polishing your own writing. Three variations is the sweet spot when you're comparing phrasings — the model is instructed to make each one noticeably different (different structures, different vocabulary). Five variations is useful for A/B testing marketing copy or when brainstorming. Each additional variation costs proportionally more tokens.
All 99 Free.ai languages. Auto-detect picks up the source language; explicit language picker (14 major languages) overrides. The paraphraser keeps your text in the source language unless you pick a different target, in which case it also translates. For non-Latin scripts (Chinese, Japanese, Arabic, Hindi) synonym swapping is semantically-aware rather than dictionary-based.
Paste up to ~5,000 words in one run. For longer documents split by section — the model's context window works best under 8K tokens. If you're paraphrasing a whole thesis chapter, run it paragraph-by-paragraph for higher quality.
Runs a word-level longest-common-subsequence diff between the original and the paraphrased output and highlights every word that is new or moved. Useful for spotting over-aggressive rewrites (Strength 4 can drift on nuance) or for selectively accepting a subset of changes.
No — first paraphrase runs free, no email, no credit card. Sign up for 10,000 free signup tokens + generation history across all 400+ Free.ai tools.
Yes. POST to /v1/chat/ with the paraphraser system prompt (bearer auth, monthly limits per plan). Useful for plugging paraphrasing into a CMS, Discord bot, or WordPress editor. Full snippets at /api/.
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