Cover Letter AI Checker
Check any cover letter for AI-generated content with 99% accuracy. See whether ChatGPT, Claude, Copilot, or another AI wrote it, with sentence-level results recruiters and applicants can trust.
How to Check Your Cover Letter for AI Content
Three simple steps to detect AI content in your Cover Letter.
Paste Your Text
Paste your text or upload a document. We support PDF, DOCX, and TXT formats for Cover Letter detection.
AI Analyzes for AI Patterns
Our multi-model detection engine analyzes every sentence for AI-generated writing patterns and statistical signatures.
Get Sentence-Level Results
Receive a detailed report with per-sentence confidence scores, highlighting exactly which portions are AI-generated.
Why Check Your Cover Letter for AI Content?
Cover letters are now one of the most heavily AI-assisted documents in the hiring process, and recruiters increasingly want to know whether an applicant wrote their own. Plagly.ai's Cover Letter AI Checker analyzes every sentence for patterns consistent with ChatGPT, Claude, Gemini, Copilot, and other models, returning a clear sentence-level breakdown of which parts appear AI-written. Because cover letters are short and formulaic, generic detectors over-flag them; our engine is calibrated to recognize genuinely AI-generated phrasing while avoiding false positives on standard professional language, maintaining a false-positive rate below 0.4%. Recruiters use it to screen applications at scale, while job seekers use it to verify that an AI-assisted draft reads as authentically theirs before they submit.
Learn more about our technologyCover Letter
Plagly's engine is optimized for Cover Letter analysis, understanding the specific formatting and content patterns typical of this document type.
Key Features
Everything you need to detect AI in your Cover Letter with confidence.
Multi-Model Detection
Detects cover letters drafted with ChatGPT, Claude, Gemini, Copilot, and other AI writing tools.
Short-Text Calibration
Tuned for the brief, formulaic nature of cover letters to avoid false positives on standard professional phrasing.
Sentence-Level Analysis
See exactly which sentences in a cover letter were likely AI-generated versus human-written.
Confidence Scores
Percentage-based confidence with a sub-0.4% false-positive rate for fair, evidence-based screening.
Privacy Protected
Cover letters are analyzed without storage, protecting applicant privacy completely.
Free to Use
Recruiters and applicants can run free cover letter scans with no account needed.
How to Check Cover Letter Content for AI
What to watch for when checking cover letter content for AI:
- Generic enthusiasm ("I am excited to apply") with no company-specific detail.
- Perfectly structured paragraphs but interchangeable content.
- Buzzword-heavy phrasing ("results-driven," "passionate professional").
- No specific anecdotes tying skills to real experience.
- A polished, formal tone that reads like thousands of others.
The useful question is not whether AI touched it
Most cover letters now pass through a language model somewhere, and a recruiter who screens on that alone will reject most of their pipeline. The question worth asking is different: does this letter contain anything that could only have been written about this candidate and this job?
Generated letters are fluent and empty
The tell is not grammar, it is specificity. "I am passionate about your mission and thrive in fast-paced environments" is well-formed and says nothing. A letter that names the actual team, a specific product decision, or a number from the candidate's own work is doing something a model could not do without being told.
The job description echo
A common shape is a letter that mirrors the posting back — same phrases, same order of requirements, each one acknowledged in turn. It is what you get when the posting was pasted into a prompt, and it reads as compliance rather than interest.
Why a high score is weak evidence here
Cover letters are short, formal and follow a template that has been taught for decades. That combination scores as machine-like whoever wrote it, so false positives are common — and rejecting a candidate on a percentage is both unfair and legally uncomfortable.
For candidates: assistance is fine, substitution is not
Using a model to tighten your own draft is unremarkable. Asking it to invent enthusiasm you do not have produces something interchangeable with every other applicant, which is a worse outcome than a plainer letter you actually wrote.
If you are screening: use the score to notice letters worth reading closely, then judge on specificity. If you are applying: the fix for an AI-flagged letter is not paraphrasing it, it is adding something only you know.
Frequently Asked Questions
Common questions about checking Cover Letters for AI content.
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