GramProof™
AI & AUTHENTICITY DETECTOR

Accurate AI Detector.

Check AI Text for Authentic Content

Verify originality with high accuracy. Check up to 2,000 words with 3 free scans every day.

Upload .docx or .txt

0 / 2,000 words Your text stays yours

A LITTLE CLARITY GOES A LONG WAY

Likely AI or Original

15% AI Allowance Selected

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AI detection is probabilistic, not proof of authorship. Review scores alongside writing history. Confidence is shown only when the detector supplies it.

BUILT FOR THE WAY WE WRITE TODAY

Accurate on leading LLMs: , , , , and more.

Excellent
4.8 out of 5·Based on 2,500+ reviews· Trustpilot

AI Detection Tool

GramProof analyzes text using state-of-the-art linguistic and neural pattern detection to identify whether content was generated by AI models like ChatGPT, Claude, and Gemini or crafted by a human writer.

Our system scans for subtle markers of machine generation—such as low perplexity, repetitive syntactic structures, and artificial cadence—giving educators, writers, and publishers full clarity on content provenance.

GramProof AI detection in Chrome
Google DocsDocs
Microsoft WordWord
Google ChromeChrome
GmailGmail

Get a writing assistant wherever you go

Bring GramProof’s AI detector directly into your daily workflow. Scan essays, articles, and emails across Google Docs, Gmail, and browser tabs with one click.

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Why use GramProof's AI detector?

Modern detection features built for precision, clarity, and peace of mind.

Sentence-Level Detection98% Confidence

Human: The field experiment examined local soil salinity trends across 15 agricultural test sites.

AI-assisted: It is crucial to acknowledge that comprehensive ecological models play an essential role.

Sentence-level probabilistic breakdown

Avoid guesswork. Instead of a blanket percentage, GramProof highlights every sentence based on burstiness, perplexity, and linguistic variation.

Color-coded visual highlights for clear human vs AI review
Configurable AI Allowance tolerances for assisted drafts

Find the best synonym using an AI-powered thesaurus.

Click on any word or sentence to see suggested synonyms and choose the perfect fit for your message.

Contextual synonym suggestions that preserve natural cadence
Instant one-click replacement with grammatical agreement
Typing on keyboard with AI thesaurus suggestions

Suggest synonyms for: original

creative
innovative
authentic

How does GramProof work?

Get comprehensive authenticity insights in three straightforward steps.

01

Enter or paste your text

Paste sentences or entire documents. Add at least 100 words for full contextual analysis.

02

Calibrate AI Allowance

Select your tolerance threshold to match your school or organization’s guidelines.

03

Review instant metrics

Explore sentence-by-sentence probabilities, confidence scores, and deep scan insights.

Creative writer workspace
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Trusted by 150M+ users worldwide
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99% satisfaction rate on writing clarity

A little more clarity

Frequently Asked Questions