QuillBot Review 2026: Is It Still the Best Paraphrasing Tool?
By Brazora Monk • May 12, 2026 • 18 min read
QuillBot has been the go-to paraphrasing tool for students and writers since 2017. In 2026, it faces more competition than ever — Grammarly Go, Wordtune, and purpose-built AI humanizers are all competing for the same users. We spent two weeks testing QuillBot Free and Premium against real academic submissions, AI detectors, and competing tools. Here’s what we found.
Quick Verdict
| Category | Score | Notes |
|---|---|---|
| Paraphrasing quality | 4.3/5 | Strong synonym depth, 7 modes cover most use cases |
| AI detection bypass | 3.1/5 | 58% detection rate by Originality.ai — declining from 2024 |
| Grammar checker | 3.5/5 | Functional but Grammarly Premium is noticeably better |
| Free tier value | 2.8/5 | 125-word limit is frustratingly low in 2026 |
| Premium value | 4.0/5 | $9.95/month is competitive for what you get |
| Overall | 4.1/5 | Best standalone paraphraser; free tier needs improvement |
Bottom line: QuillBot Premium remains the best dedicated paraphrasing tool available in 2026. The free tier is now too limited for serious use. If you write regularly, the $6.67/month annual plan pays for itself after a single saved editing session.
What QuillBot Does (and Doesn’t Do)
QuillBot is an AI-powered paraphrasing and writing tool built around a transformer-based model fine-tuned specifically for sentence-level rewriting. Unlike general-purpose AI writers (ChatGPT, Claude, Gemini), QuillBot doesn’t generate new content from scratch — it restructures and rewrites text you provide.
Its core paraphraser works by analyzing the semantic meaning of your input and generating output that preserves meaning while changing vocabulary, sentence structure, and phrasing. The synonym slider lets you control how aggressively it makes changes — from minimal surface edits (level 1) to near-complete restructuring (level 5 on Premium).
Beyond paraphrasing, QuillBot includes:
- Grammar Checker — flags grammatical errors, suggests corrections
- Plagiarism Checker (Premium only) — checks text against web content
- Summarizer — condenses long text to key points
- Citation Generator — APA, MLA, Chicago format citations from URLs
- Translator — translates content in 45+ languages
- Co-Writer — a basic writing environment combining all tools
QuillBot does NOT write original content from a prompt, does not generate images, and is not a general AI assistant. It’s a focused editing and restructuring toolkit.
How to Use QuillBot: Step-by-Step Guide
Getting good results from QuillBot requires more than clicking “Paraphrase.” Here’s the workflow that produces the best output.
Paste your text into the input box
Copy the paragraph or sentence you want to rewrite and paste it into the left panel. Free users: max 125 words per session. If your text is longer, break it into chunks. One paragraph at a time produces better output than forcing the limit.
Select the right paraphrasing mode
This is the most important choice. Match the mode to your goal:
- Standard — general rewriting, preserves original meaning closely
- Fluency — fixes awkward phrasing; best for non-native English
- Formal — elevates vocabulary; best for academic/business writing
- Simple — reduces complexity; best for explaining to general audiences
- Creative — most varied output; higher risk of meaning drift
- Expand — adds detail and elaboration to short text
- Shorten — condenses verbose writing; excellent for tightening drafts
Set the synonym slider
Free users get 0–4; Premium users get 0–5. Level 2–3 is the sweet spot for most writing: enough change to rewrite the phrasing without distorting meaning. Level 4–5 produces the most human-varied output but requires careful review to ensure accuracy.
Click Paraphrase and review highlighted changes
QuillBot highlights substituted words in orange. Hover over any highlighted word to see the original and alternatives. Click to swap. Always re-read the full output — the tool occasionally introduces subtle meaning changes, especially with technical vocabulary or proper nouns.
Check for AI signals if needed
If you’re rewriting AI-generated content to reduce detection signals, paste the output into EyeSift’s free text analyzer to see whether AI patterns remain. QuillBot alone at default settings typically reduces AI probability scores by 20–35 percentage points, but does not reliably eliminate them from advanced detectors.
Pro tip: For maximum results, run text through QuillBot once on “Creative” mode at level 3–4, then make manual edits to any awkward phrases. This two-pass approach produces significantly more human-feeling output than any single automated run.
All 7 QuillBot Modes: Tested on Real Text
We paraphrased the same 3-sentence paragraph through all 7 modes to show how dramatically output varies. Original text: “The Federal Reserve raised interest rates by 25 basis points, citing persistent inflation above the 2% target. Mortgage rates climbed to 7.1% for a 30-year fixed loan. Housing affordability fell to its lowest level since 1985.”
| Mode | Output sample | Meaning preserved |
|---|---|---|
| Standard | The Fed raised rates 25bps due to inflation exceeding 2%. 30-year mortgage rates rose to 7.1%. Housing affordability dropped to its lowest since 1985. | ✓ High |
| Fluency | The Federal Reserve increased interest rates by 0.25%, pointing to ongoing inflation above its 2% target. Rates on 30-year fixed mortgages rose to 7.1%. Home affordability reached its lowest point since 1985. | ✓ High |
| Formal | The Federal Reserve implemented a 25-basis-point rate increase, attributing the decision to persistent inflationary pressures exceeding the established 2% threshold. Thirty-year fixed mortgage rates ascended to 7.1%. Residential affordability indices declined to levels not observed since 1985. | ✓ High |
| Simple | The Fed raised interest rates because prices are still going up too fast. Home loan rates went up to 7.1%. Buying a home is now harder than it was in 1985. | ~ Medium |
| Creative | In a move that sent shockwaves through the housing market, the Federal Reserve bumped rates another quarter point to battle stubborn inflation. Mortgage rates broke through 7%, and prospective homebuyers found themselves in the toughest market in four decades. | ~ Medium (added drama) |
| Expand | The Federal Reserve, in its ongoing battle against inflation that has consistently exceeded its target rate of 2%, made the decision to raise interest rates by 25 basis points... [adds ~60% more text with context and elaboration] | ✓ High |
| Shorten | The Fed raised rates 25bps on inflation concerns; mortgage rates hit 7.1% and housing affordability fell to 40-year lows. | ✓ High |
Key takeaway: Formal mode is the safest for academic writing — it preserves meaning while elevating vocabulary. Creative mode is the most powerful for generating varied rewrites but introduces the highest risk of unintended meaning changes. Always review Creative mode output sentence-by-sentence.
AI Detection Bypass Rates: 2026 Test Data
This is the question most users care about. We tested QuillBot’s paraphrased output against five major AI detectors using the same source material: 500-word AI-generated text from GPT-4o.
| Detector | Original (unmodified) | After QuillBot Standard (3) | After QuillBot Creative (4) |
|---|---|---|---|
| EyeSift | 94% AI | 51% AI | 38% AI |
| GPTZero | 97% AI | 44% AI | 31% AI |
| Originality.ai | 98% AI | 58% AI | 45% AI |
| Copyleaks | 99% AI | 62% AI | 47% AI |
| Turnitin AI | 95% AI | 67% AI | 53% AI |
Key finding: QuillBot significantly reduces AI detection probability but does not reliably eliminate it. Turnitin remains the hardest detector to fool — even after Creative mode paraphrasing, Turnitin flags over half the text as AI-assisted. Detectors have clearly been retrained to recognize QuillBot’s paraphrasing patterns specifically.
This data also illustrates why detection scores vary between tools — each uses different models and features. Use EyeSift’s free detector for a baseline check, then cross-reference with GPTZero if you need higher confidence.
Important note: attempting to bypass academic AI detection likely violates your institution’s academic integrity policy. This data is presented for informational and research purposes — to help educators understand what tools students are using and at what detection rates.
QuillBot vs Alternatives (2026)
| Tool | Paraphrasing | Grammar | Free tier | Price |
|---|---|---|---|---|
| QuillBot | ★★★★☆ | ★★★☆☆ | 125 words | $9.95/mo |
| Grammarly | ★★★☆☆ | ★★★★★ | Generous | $12/mo |
| Wordtune | ★★★★☆ | ★★★☆☆ | 10 rewrites/day | $9.99/mo |
| ProWritingAid | ★★★☆☆ | ★★★★☆ | 500 words | $10/mo |
| Scribbr Paraphraser | ★★★☆☆ | ★★☆☆☆ | Unlimited (basic) | Free |
For pure paraphrasing power, QuillBot and Wordtune are essentially tied. QuillBot wins on mode variety (7 vs 4); Wordtune wins on interface and sentence-level granularity. Grammarly outperforms both on grammar correction but lags on paraphrasing depth. For students on a budget, Scribbr’s free paraphraser and Wordtune Free (10 rewrites/day) are the strongest no-cost options.
Is QuillBot Safe for Academic Use?
This is a genuinely nuanced question in 2026, as institutional policies have evolved significantly.
What’s generally acceptable: Using QuillBot to improve the clarity and fluency of your own writing — text you researched and structured yourself — is broadly treated as legitimate editing assistance. This is similar to using a thesaurus or asking a writing center tutor to review a draft.
What’s not acceptable: Using QuillBot to paraphrase source material without understanding it, to disguise plagiarism, or to rewrite AI-generated text before submission. A 2025 survey of 87 universities found that 71% explicitly prohibit AI paraphrasing tools in academic submissions when used to mask AI origin.
The practical risk: Even after QuillBot processing, Turnitin flags over 53% of AI-generated text (per our tests above). Turnitin’s AI detection is specifically trained on paraphraser patterns. The risk of false negatives giving false confidence is real.
If you’re unsure whether your use of QuillBot complies with your institution’s policy, check the syllabus, ask your instructor directly, or consult your writing center. The safest approach is to use QuillBot as a drafting aid for your own text, not as a tool for restructuring others’ writing or AI output.
Final Verdict: Should You Use QuillBot in 2026?
Use QuillBot if:
- You write or edit documents regularly and need fast rewrites
- You want to improve the formality or readability of your own writing
- You need a variety of rewriting modes for different content types
- $6–10/month fits your budget and you’ll use it weekly
- You want plagiarism checking bundled into one tool
Skip QuillBot if:
- You only need grammar correction (use Grammarly)
- You need to reliably bypass advanced AI detectors (it won’t)
- You only paraphrase short texts occasionally (Scribbr free tier works)
- You need original content generation (use Claude, ChatGPT, or Jasper)
- Your institution prohibits AI writing tools entirely
QuillBot Premium at $6.67/month (annual) remains one of the best deals in AI writing tools for frequent writers. The free tier is now too limited to be practically useful for anything beyond a quick paragraph rewrite. If you’re evaluating QuillBot for the first time, start with the 3-day free Premium trial before committing.
Want to check how your text scores on AI detectors after paraphrasing? Use EyeSift’s free AI text analyzer — no sign-up required, no word limit.