How to check your essay for AI before you submit it

Updated October 31, 2026 · 3 min read

Short answer

Paste your essay into an AI detector and look at which passages it highlights, not just the overall score. Then ask why those passages read like AI. Usually it's a section you polished with an AI rewriting tool, very generic phrasing, or text you didn't fully write yourself.

Rewrite flagged passages in your own words with your own examples, keep your version history on, and don't use an "AI humanizer": Turnitin says it now looks for text modified by those tools. Remember that no detector, including the one your school uses, is proof either way.

Why check your own essay?

Human writing sometimes gets flagged. Plain, predictable phrasing and formulaic structure can look like AI to a detector. Why it happens.
AI polishing raises scores. In a 2025 study, 75 to 85% of human-written research letters were flagged as AI after ChatGPT polished them. A 2026 study found lightly AI-edited abstracts flagged 38 to 80% of the time.
You'll see what your teacher might see, while there's still time to change it or prepare your evidence.

How to check it, step by step

Use your final draft. Check the version you plan to submit, not an early one.
Check enough text. Turnitin doesn't score English documents with under 300 words of prose, and every detector is less reliable on short passages. In AI Checker Plus, the free check covers the first 300 words; Plus checks up to 5,000 words at once.
Read the highlights, not just the number. Which passages are marked AI-generated or AI-assisted? Are they the introduction and conclusion, a section you edited with an AI tool, or scattered sentences?
Ask why each flagged passage reads as AI. The table below covers the usual reasons.
Revise honestly, then check again. Rewrite flagged passages in your own words, add your own examples and reasoning, and cut filler.
Keep your evidence. Leave version history on, save your drafts and keep the check result in case questions come up later.

What should you do about each kind of flag?

What was flagged	Likely reason	What to do
A passage you polished with an AI rewriting tool	The tool rewrote your sentences, so they now carry AI patterns.	Go back to your own version and fix it by hand. Simple spelling and grammar fixes are usually fine; Pangram, for example, counts them as human writing.
Generic intro or conclusion ("In today's world...")	Stock phrasing is predictable, and predictable text looks like AI.	Make it specific: your question, your argument, your examples.
Text copied from a chatbot	It is AI-written, quotes included.	If your course allows AI, cite or disclose it as required. If not, write that part yourself.
Text you wrote entirely yourself	A false positive. It happens, especially with plain, formulaic writing.	Don't distort your writing to please a detector. Keep drafts and version history, and be ready to explain your work.

Should you use an AI humanizer?

No. A humanizer doesn't change whether you used AI against your course's rules, and it can still be caught:

Turnitin announced in August 2025 that its detection now covers text "that may have been intentionally modified by AI humanizer tools" (English only).
Some detectors catch most humanized text: in a June 2026 study, Pangram flagged 37 of 40 papers that AI had rewritten to sound human.
Humanized text can read strangely, with odd word swaps a teacher may notice without any detector.

Humanizers do sometimes get past detectors; the research is mixed. That's exactly why a passing score on humanized text proves nothing, to you or to your teacher. What the research found.

How can you protect yourself before you submit?

Write where history is saved. Baylor's library advises: "In Google Docs, version history is on by default under File → Version History. In Microsoft Word, turn on AutoSave and keep prior versions."
Save drafts and notes. Cornell suggests keeping numbered drafts and any AI chats; Texas A&M's writing center suggests saving multiple versions as you work.
Follow your course's AI rules, and disclose AI help where it's allowed.
Know what to do if you're flagged anyway. Step-by-step plan.

Questions people also ask

Is it safe to paste my essay into an AI checker?

Check the tool's privacy policy first. AI Checker Plus deletes free checks after a day and paid checks after 30 days, and never sells your text or uses it to train AI. Policies differ between tools, so look for how long they keep your text and whether they reuse it.

Will a plagiarism checker catch AI writing?

Not reliably. Plagiarism checkers look for text copied from existing sources, and AI usually writes new sentences, so AI text can pass a plagiarism check with 0% matches. You need an AI detector for AI writing. AI Checker Plus runs both checks.

My essay is human but still gets flagged. What should I do?

Don't twist your writing to please a detector. Keep your drafts and version history, note which passages were flagged, and be ready to explain how you wrote them. If you're accused later, that evidence matters far more than any score.

If my essay passes one detector, will it pass Turnitin?

Not necessarily. Detectors measure different things and disagree: in a 2026 study of 160 papers, four tools gave very different results on the same texts. A clean result elsewhere is reassuring, not a guarantee.

Sources

By the AI Checker Plus team. We research and draft these guides with help from AI tools, then check every claim against the sources listed above.