ContentDetector.org

ContentDetector.org is a free AI-writing detector with a short-form rewriting converter. It best suits publishers, SEO teams, agencies, educators, and learning-and-development teams that want a first-pass check across text, files, or URLs. Its combination of review guidance and bulk options is useful, but detector scores should not decide authorship on their own.

Overview

Paste text, upload a file, or submit a URL to receive an estimate of how much content appears AI-written versus human-written. Reports add section-by-section highlights and review guidance, which can help a reviewer focus on passages that merit closer attention rather than rely on one overall percentage.

The site says its scoring considers token-pattern predictability, semantic repetition, formatting regularity, and local bursts of uniform phrasing. It evaluates patterns associated with GPT-5, Gemini, Claude, and other large models. These signals provide context for the estimate, not proof of who wrote a passage. The site warns that results can be wrong, particularly for very short or heavily edited text, and recommends human review.

Key features

Detection and review

Highlights and guidance make the report more practical for editorial or educational review than a score alone. They still require a person to assess the passage and its context; a false result could otherwise lead to an unjustified conclusion.

Rewriting and bulk checks

The AI-to-human converter rewrites AI-generated text to improve tone, flow, clarity, and sentence variety. Its input counter caps submissions at 1,000 characters, so it suits short passages better than long-form revision. For larger screening workloads, the homepage describes document uploads, API connections, and folder or URL-list checks. API access and batch scanning broaden its use for teams, though the facts do not give a batch quota.

Privacy and support

The homepage says inputs are not used to train models and that users can control retention through workspace settings. Its FAQ says detection inputs are kept only as needed to generate a report and removed when the tab is closed; the converter says submitted content is processed instantly and never stored. The contact page offers email, phone, and a form, with a promise to respond as soon as possible. These statements make the privacy approach clear at a high level, while the detection and converter descriptions differ in their retention wording.

Pricing

The Free plan costs nothing and includes AI content detection and the AI text converter, with converter inputs limited to 1,000 characters. That is a straightforward starting point for individuals and teams that need occasional checks or short rewrites. No paid tier or larger converter allowance is described, so readers needing more rewriting capacity should consider whether the cap fits their workflow before adopting it.

Platforms

ContentDetector.org is listed for web, iOS, macOS, Windows, and extension use. API access and batch scanning support workflows beyond individual browser checks, though no additional platform-specific capabilities are described.

Who it's for

Publishers, SEO teams, and agencies can use it for initial screening across URLs, files, or batches, while educators and learning-and-development teams can use section highlights to guide human review. It is less suitable when a high-stakes authorship decision depends on a detector score, or when rewriting routinely exceeds the 1,000-character converter limit.

Pros and cons

• Pros: Free detection and conversion make it accessible for initial checks without a subscription.
• Pros: Reports pair an AI-versus-human estimate with section highlights and guidance, giving reviewers more to examine than a score alone.
• Pros: File and URL inputs, API access, and folder or URL-list checks offer options for individual and team workflows.
• Cons: Results can be wrong, especially on short or heavily edited text, limiting their value as standalone evidence.
• Cons: The converter accepts only 1,000 characters, constraining longer rewriting tasks.

Alternatives

AI Content Detectors is the category directory for comparing more tools. Choose AI Detectors.io if a defined monthly allowance matters: its free plan includes 10,000 words per month, one free daily credit, and a 500-word limit per use. GPTZero is another free option, with 10,000 words per month and 50,000 characters on its free plan. Consider It's AI if file upload and three deep scans are important; its free plan allows 4,000 words and up to 10,000 characters per scan. Winston AI may suit readers seeking a trial that combines AI and image detection with document and OCR scanning; its free plan is a 2,000-credit, 14-day trial. Originality.ai offers a free option with three scans per day, up to 2,000 words per scan, and DOCX or PDF uploads. Pangram is worth considering for a daily allowance of 2,000 words, image scans, OCR, and support for more than 20 languages. Proofademic fits readers who want multilingual detection alongside a plagiarism checker and report export in a three-day trial. TrustOriginality.ai offers one text analysis per month on its free plan and a paid Quick Check plan with three multimodal verifications per month.

Verdict

Choose ContentDetector.org for free first-pass screening when you value review guidance, multiple input routes, and the option to check batches. Its main advantage is putting those checks and a short converter in one service; its main limitation is that estimated scores can be wrong and the converter is capped at 1,000 characters. For consequential authorship decisions, or regular long-form rewriting, look elsewhere and keep human review central.