ContentDetector.org

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Score7.1

Rank#2 of 25

PriceFree

Free planYes

Runs onBrowser extension, iOS, macOS, Web, Windows

Summary

ContentDetector.org is a free tool that estimates whether text was written by AI and displays a percentage for AI-written versus human-written content. You can paste text, upload a file, or submit a URL for a report with a score, section highlights, and review guidance. The site says its detector scores patterns such as token predictability, semantic repetition, formatting regularity, and bursts of uniform phrasing, and evaluates patterns associated with GPT-5, Gemini, Claude, and other large models. It also offers an AI-to-human converter that rewrites generated text to improve tone, flow, clarity, and sentence variety; the converter page shows a 1000-character input counter. Other listed options include document uploads, API access, and bulk checks of folders or URL lists. Platforms include web, browser extension, iOS, macOS, and Windows. The site says inputs are not used to train models and describes retention controls; the converter page says submitted content is processed instantly and not stored. It cautions that results can be wrong, especially for very short or heavily edited text, and recommends human review.

Who it is for

The site identifies publishers and SEO teams, agencies, educators, and learning-and-development teams as potential users. Its results are best treated as prompts for human review rather than conclusive judgments.

What is good

Free plan includes detection and text conversion.
Accepts pasted text, files, and URLs.
Reports include scores and section highlights.
Supports API access and batch scanning.
Available as a browser extension and on listed operating systems.

What to know first

Detection may be wrong on short text.
Heavily edited text can be difficult to assess.
Converter input counter is 1000 characters.

Verdict

ContentDetector.org combines AI-text estimates with review guidance and a rewriting tool. Its own caveat matters: detector scores can be wrong, so use human review.

ContentDetector.org plans and pricing

All plans

Free Free AI content detection and AI text converter; converter accepts up to 1000 characters contentdetector.org · 4 Oct 2026

Compared on AI content detectors

Free plan: Yescontentdetector.org
API access: Yescontentdetector.org
Browser extension: Yescontentdetector.org
Batch scanning: Yescontentdetector.org

Facts

AI detection: The detector estimates whether text was AI-written and shows a percentage of AI-written versus human-written content.contentdetector.org · 4 Oct 2026
Inputs: The homepage says users can paste text, upload a file, or submit a URL for a detection report.contentdetector.org · 4 Oct 2026
Reports: Detection reports include a score, section-by-section highlights, and guidance for reviewing content.contentdetector.org · 4 Oct 2026
Detection signals: The site says its system scores token-pattern predictability, semantic repetition, formatting regularity, and local bursts of uniform phrasing.contentdetector.org · 4 Oct 2026
Supported models: The site says it evaluates patterns associated with GPT-5, Gemini, Claude, and other large models.contentdetector.org · 4 Oct 2026
Humanizer: The AI-to-human converter rewrites AI-generated text to improve tone, flow, clarity, and sentence variety.contentdetector.org · 4 Oct 2026
Converter limit: The converter page displays a 1000-character input counter.contentdetector.org · 4 Oct 2026
Integrations and bulk: The homepage says users can upload documents, connect the API, or run a folder or URL list for bulk checks.contentdetector.org · 4 Oct 2026
Platforms: The homepage lists the web app, Chrome extension, desktop apps for Mac and Windows, and iOS apps.contentdetector.org · 4 Oct 2026
Privacy: The homepage says user inputs are not used to train models and says users can control retention through workspace settings.contentdetector.org · 4 Oct 2026
Retention: The homepage FAQ says inputs are kept only as needed to generate a report and removed when the tab is closed.contentdetector.org · 4 Oct 2026
Converter privacy: The converter page says submitted content is processed instantly and never stored.contentdetector.org · 4 Oct 2026
Detection caveat: The site says detector results can be wrong, especially for very short or heavily edited text, and recommends human review.contentdetector.org · 4 Oct 2026
Audience: The homepage identifies publishers and SEO teams, agencies, educators, and learning-and-development teams as intended users.contentdetector.org · 4 Oct 2026
Support: The contact page provides an email address, phone number, and contact form, and says the team will respond as soon as possible.contentdetector.org · 4 Oct 2026