How Scribbr detects AI writing
Scribbr is an academic writing service whose free AI detector is aimed at students checking essays and theses before submission. Like most classifiers, it looks for statistical fingerprints that language models leave behind: highly predictable word choices (low perplexity), sentences of very similar length and rhythm (low burstiness), and stock transitions such as "furthermore", "in conclusion", and "it is important to note".
No detector reads intent. Scribbr only estimates probability, which is why human writing sometimes gets flagged and lightly edited AI text sometimes slips through. Understanding that helps you focus on what actually matters: writing that sounds varied, specific, and personal.
Step-by-step: how to pass Scribbr
First, paste your draft into the Humanizely tool above and choose a mode. Standard works for most text, Academic suits essays and papers, and Casual is best for blogs and social posts. Press Humanize and wait a moment for the rewrite.
Second, check the AI detection score bar. If it shows a high human score, read the result once for accuracy. Third, add something only you could write: a real example, a source you actually read, or a sentence of opinion. Finally, run the finished text through Scribbr yourself to confirm it reads as human before you submit or publish.
Why humanizing works better than word swapping
Old-style spinners replace words with synonyms, which often produces awkward phrasing and still keeps the same predictable sentence skeleton. Scribbr looks at structure, not just vocabulary, so synonym swaps rarely move the score. Humanizely rebuilds sentences, varies their length, and changes the order of ideas the way a human editor would.
Mistakes to avoid
Do not add random typos or invisible characters. Modern detectors, including Scribbr, normalize text and these tricks can flag a document as manipulated. Avoid running the same text through several paraphrasers in a row, which tends to blur meaning. And never submit work that breaks your school's or client's rules: the goal is clear, natural writing that represents your own thinking.