Does QuillBot detect AI?
Paraphrasing and writing tools. Last updated . Every claim here links to a source at the bottom.
How does QuillBot check for AI?
QuillBot's detector scores text for AI-like patterns and returns an estimated percentage. It is a free, web-based check aimed at quick screening rather than institutional use. As with all detectors, the score reflects surface writing patterns, not a record of how the text was produced.
What this means for you
QuillBot's detector is handy for a fast self-check, but treat the number as a rough signal. Because the same company's paraphraser can defeat detectors, a clean QuillBot score does not prove text is human, and a flag does not prove it is AI.
Limitations to know
- Free web detectors are best for screening, not for decisions about a person.
- Paraphrasing reliably lowers detector scores (Sadasivan et al. 2023).
- Non-native English writing is more likely to be misread as AI (Liang et al. 2023).
What you should do
- Use QuillBot's detector as a quick first look, then cross-check with another tool.
- Do not rely on any single score to judge authorship.
- Revise flagged passages in your own voice rather than running them through a paraphraser.
Check your own writing first
Is It AI? is free, with no signup. It highlights the passages that look AI-generated and explains why, so you can revise in your own voice before you submit.
Try Is It AI? freeRelated reading
Sources
- QuillBot: AI content detector
- Sadasivan et al. (2023): Can AI-generated text be reliably detected?
- Liang et al. (Stanford, 2023): GPT detectors are biased against non-native English writers