Does ChatGPT Watermark Its Text? What OpenAI Actually Does
Does ChatGPT watermark text? No hidden watermark exists in its prose as of mid-2026. What OpenAI actually ships, and what that means for detection.
Sep 25, 2026 · 6 min read
Text · Images · Video — one detector
Check text, essays, images and video for AI generation. Multi-engine scores with sentence-level heatmaps, provenance checks and confidence levels — because a bare percentage isn't evidence.
Built-in engine · upgrade to multi-engine analysis free · how scoring works
Most detectors stop at text. AI Detector 360 covers the full picture — literally.
Multi-engine scoring with per-sentence heatmaps. 1 credit per 100 words.
Text detector →Upload PDF or DOCX — we extract the text and analyze it, ideal for papers.
Essay checker →Classifier + C2PA/EXIF provenance + likely generator (Midjourney, DALL·E, Flux…).
Image detector →Frame-by-frame sampling across the timeline with an AI-likelihood heat chart.
Video detector →Detectors that promise "99.9% accuracy" have flagged the US Constitution as AI-written and disproportionately misflag non-native English writers. We take the opposite approach:
Paste or upload
Text, PDF/DOCX, image or video — up to 30,000 words or 100 MB.
Engines analyze
ML classifiers, stylometric signals and provenance metadata run in parallel.
Blended verdict
Confidence-weighted score from 0–100% with a plain-language verdict.
Inspect & export
Sentence/frame detail plus a shareable PDF report.
1 credit = 100 words of text · image = 5 credits · video = 25 credits.
Free
$0/mo
300 credits/mo
Scanner + reports, forever free
Starter
$9.99/mo
4,000 credits/mo
Images, video & full PDF reports
Pro
$24.99/mo
15,000 credits/mo
Priority processing for heavy use
Yearly billing saves ~33% · one-time credit packs available
Yes. The homepage scanner is free with no sign-up (up to 5,000 characters, 5 scans/day). A free account adds 300 monthly credits, full multi-engine analysis, image checks and PDF reports. Paid plans start at $9.99/month.
No AI detector is 100% accurate — including ours. Independent research shows every tool produces false positives and false negatives. That is why every AI Detector 360 result includes a confidence level and per-sentence detail instead of a bare percentage.
The text engines are trained on output from ChatGPT/GPT-4/GPT-5-class models, Claude, Gemini, Llama and other modern LLMs. Image and video checks cover Midjourney, DALL·E, Stable Diffusion, Flux, Sora-class generators and face-swap deepfakes.
Yes — that is our specialty. With a free account you can scan images (classifier + C2PA/EXIF provenance + likely-generator attribution) and videos, which we analyze frame by frame across the timeline.
Anonymous free scans are not stored — we only log the score. Account scans are saved to your private history so you can download PDF reports, and you can delete them at any time.
An advanced AI detector combines several independent signals instead of one model: multiple detection engines, sentence-level heatmaps, provenance checks (C2PA/EXIF metadata), generator attribution and an explicit confidence level. AI Detector 360 runs all of these on every full scan — a single-engine score with no confidence context is what we would call basic.
There is no single winner: independent studies show accuracy depends on text length, genre, language and whether anyone tried to evade detection. Instead of one headline number, look for published error rates, confidence reporting and multi-engine coverage. We explain exactly how we measure ourselves on our methodology page.
More questions? Visit the full FAQ.
Does ChatGPT watermark text? No hidden watermark exists in its prose as of mid-2026. What OpenAI actually ships, and what that means for detection.
Sep 25, 2026 · 6 min read
How AI detectors are trained: paired human and machine corpora, label noise, domain gaps, and why a classifier that was sharp in March slips by September.
Sep 25, 2026 · 9 min read

How we test AI detectors: balanced human and AI sample sets, accuracy measured at a fixed false-positive rate, and why we report confidence, not certainty.
Sep 25, 2026 · 5 min read