Who this guide is for
For students following institutional rules, educators reviewing flagged work, and professionals editing permitted AI-assisted drafts. Check model-estimated signals with our AI Detector and refine wording with our Paraphrasing Tool.
How Grammarly works
Grammarly's AI detector sits inside the Grammarly editor and returns an overall percentage of text that resembles AI output, alongside its writing suggestions.
Like other AI-text detectors, Grammarly compares patterns in your writing — word predictability, sentence rhythm and repeated phrasing — with patterns from its training examples, then reports a likelihood. That result is a statistical estimate, not proof of authorship. Check Grammarly's own documentation for current details: https://www.grammarly.com/ai-detector
1. Interpret Grammarly as a signal, not a verdict
AI-text detectors broadly classify writing using statistical patterns associated with their training examples. That does not establish the origin of an individual document. Human writing can receive false-positive classifications, and generated writing can go undetected. Do not treat a displayed percentage as a proven percentage of words written by AI; consult Grammarly’s current explanation of the particular result.
Read the entire passage before reacting to highlighted sentences. Repeated sentence structures, generic transitions, or predictable phrasing may be editorial problems, but none independently proves AI use. Avoid claiming that Grammarly uses a particular proprietary mechanism unless its current documentation supports that claim. For consequential decisions, combine any detector output with draft history, source notes, relevant policies, and a conversation with the author.
2. Use Standard mode to improve meaning, not camouflage
Before submitting text to Humanizely, save an untouched copy and identify what must remain fixed: quotations, citations, dates, units, achievements, and numerical claims. Use Standard mode as an editing step, then compare its output against that list. Humanizely’s free allowance is 500 words per request; choose a coherent passage rather than splitting sentences or separating claims from their citations.
Accept revisions that clarify the subject, remove empty introductions, or replace vague assertions with supported detail. Reject changes that invent personal experiences, inflate achievements, or make qualified evidence sound certain. Deliberate errors, awkward synonyms, and fabricated anecdotes do not establish human authorship. For academic or admissions work, submit original work, follow institutional policies, and disclose assistance when required. If AI rewriting is prohibited, do not use it.
3. Validate the revision and retain your drafts
Check factual accuracy before considering another detector run. Open each cited source, confirm that it supports the adjacent statement, and verify quotations against the original. For workplace writing, compare achievements with project records and confirm that confidential material may be shared with external tools.
If you evaluate the revised text in Grammarly, keep the original and revised versions, record the test date, and use comparable input lengths and settings where available. A changed classification does not prove better writing or different authorship. Stop revising when the text is accurate, readable, and compliant—not when a detector produces a preferred label. Retain outlines, tracked changes, research notes, and required AI-use disclosures. These provide process evidence, though no single item conclusively proves authorship.
How to write naturally
Write from your own notes and outline, in your own voice. Vary sentence length the way you would when speaking, cut filler transitions, and add specific details you can verify. Keep drafts and sources so you can explain your process. Follow your school's or employer's AI policy, and review any tool's output before you use it.
