August 24, 2026 · 6 min read

What AI Detectors Actually Flag in Your Writing (2026)

Back at school and worried your essay will be flagged? Here are the specific patterns AI detectors look for — and how to fix them in writing you wrote yourself.

New term, same worry: you wrote the essay yourself and it still comes back flagged. AI detectors don't search a database of AI text — they look for statistical patterns. Knowing which patterns they react to is the difference between a panicked rewrite and a five-minute fix.

1. Sentences that are all the same length

Human writing is uneven — a long, winding sentence followed by a short one. AI output tends to be smooth and uniform. Detectors measure that variation (often called burstiness), and low variation is one of the strongest signals. Fix: deliberately vary your sentence lengths. Let one run long. Then cut one short.

2. Cliché connectors and stock phrases

Phrases like 'in today's fast-paced world', 'it is important to note', 'delve into', 'moreover', and 'in conclusion' appear far more often in generated text. Fix: cut them or replace them with something specific to your argument.

3. Predictable word choice

Detectors estimate how predictable each word is given the ones before it. Text where every word is the most obvious next word scores as machine-like. Fix: use your own concrete examples, specific names, numbers and details — they're inherently unpredictable and read as human.

4. Perfectly even structure

Four paragraphs of nearly identical length, each with a neat topic sentence, is a pattern. Real essays are lumpier — one point deserves more room than another. Fix: let your strongest argument take more space.

5. No voice, no stance

Generated writing hedges and stays neutral. Human academic writing takes a position and defends it. Fix: say what you actually think and back it with evidence.

Check before you submit

The practical move is to scan your own work first and see which passages read as machine-like, then rewrite those specific parts. Skrubly's AI Content Detector highlights the passages that score highest so you know exactly where to look — it's free, needs no sign-up, and runs in your browser, so your essay isn't stored anywhere.

The honest caveat

No detector is definitive, and false positives are a documented problem — particularly for non-native English writers and for anyone taught to write in a plain, structured style. A score is a prompt to review your writing, never proof of anything. Use it to make your own work clearer and more distinctly yours.