12 Best AI Content Detectors to Detect AI Text in 2026

Arshiya Kunwar Picture of Arshiya Kunwar
February 24, 2026
Last Updated: October 9, 2026

AI writing is now common enough that most publishers, universities, and hiring teams need a way to check what they are reading. AI content detectors do that by looking at sentence structure, word choice, and predictability, then returning a probability rather than a verdict. None of them is certain, and the gap between a useful score and a false accusation is narrow.

This guide explores the 12 best AI content detectors in detail and what each one is actually good at, including options commonly considered among the best AI content detector choices for different needs. If you are searching for the best AI content detector 2026 option, the right choice will depend on whether you need a quick personal check, an academic tool, or software for a publishing workflow. There is no single best AI detector for every situation, and the best AI detection software for one user may not suit another. AI content detectors such as Originality.ai, Copyleaks, GPTZero, Pangram, and Turnitin are known for their accuracy and are built for publishers and institutions. Winston AI, Sapling.ai, and Smodin, on the other hand, suit writers and small teams who need quick checks. ZeroGPT and Scribbr offer free checks for occasional use. Undetectable AI and Proofademic round out the list with narrower use cases.

We’ve compared accuracy claims, false positive rates, pricing, and platform support so you can pick one that fits how you work. This overview of best AI content detector tools focuses on practical differences rather than treating any detector score as definitive.

Key Takeaways

Detectors measure pattern predictability rather than authorship. Every output is an estimated probability, so scores should guide human judgment rather than replace it.
False positives carry disproportionate real-world risk. Academic prose, heavily edited drafts, and non-native English writing trigger false flags far more frequently than marketing pages acknowledge.
Marketing claims rarely match independent benchmarks. Vendors advertise accuracy rates near 99%, but independent testing consistently yields lower results that degrade further as LLMs evolve.
Platforms are segmented by function. For example, institutional LMS integrations, low-false-positive developer APIs, quick free spot-checkers, and bundled student suites serve completely different workflows and thus are grouped separately.
Verification is shifting from output analysis to process tracking. Document version histories, editing logs, and drafting replays provide the only reliable defense against false accusations.

How We Tested and Compared the Best AI Content Detection Tools

We compared each AI content detector using the same types of text and consistent testing conditions. Our evaluation included both AI-generated and human-written content to see how reliably each tool could distinguish between them. We looked at several factors, including:

Detection accuracy: How consistently the tool identified AI-generated content.
False positives: How often the tool incorrectly flagged human-written content as AI-generated.
AI scoring: How clearly the tool communicated its confidence or likelihood that content was AI-generated.
Sentence-level analysis: Whether the tool could identify specific sections that may have been AI-generated.
Ease of use: How simple it was to upload, scan, and understand the results.
Speed: How quickly each detector returned its results.
Free and paid features: What users get at different pricing levels, including scan limits and additional features.

Because AI detectors can produce false positives, we did not judge a tool based on detection scores alone. This is particularly important when comparing the best AI content detection tool for high-stakes academic or workplace decisions. We considered accuracy, usability, transparency, and practical features together when comparing the platforms.

Best AI Content Detector Tools Explained

**Quick Overview**
Best AI Content Detectors	Best For	Prices	Platform Compatibility
GPTZero	Education and institutional use	Free: 10,000 words/month Premium: $23.99/month Professional: $45.99/month	Web, Chrome extension, Google Docs, Google Classroom, Canvas, API
Sapling.ai	Developers who need detection through an API	Free: Unlimited checks up to 2,000 characters Pro: $25/month Enterprise: From 10 seats at $15/user/month	Web, browser extension, API
Pangram	Lowest false positive rate	Free: 2,000 words/day Individual: $20/month Professional: $65/month Team: $40/month	Web, browser extension, Google Docs, Gmail, API
Undetectable AI	Humanizing, with detection attached	From $19/month for 20,000 words Annual plans start at $5/month, billed annually	Web, Chrome extension
Turnitin	Universities and schools	No public price. Sold to institutions by quote only	LMS integrations including Canvas, Moodle and Blackboard
Smodin	Students who want detection bundled with writing tools	Starter: $12.99/month Premium: $19.99/month	Web, Chrome extension
Proofademic	Academic proofreading with detection	Free: 1,000 words per scan Essential: $15/month Premium: $25/month Professional: $45/month	Web
Originality.ai	Detecting AI-generated content within text	Pro Plan: $14.95/month Enterprise Plan: $179/month	Integrates with various content management systems and platforms
Copyleaks	AI content detection	Copyleaks offers various plans: Personal: $16.99/month Pro: $99.99/month Enterprise: Talk to sales Education: Talk to sales	Google Chrome (recommended), Microsoft Edge, Apple Safari
ZeroGPT	Detecting AI-generated text across various platforms	Free: $0/month Pro: $13.99/month Plus: $22.99/month Max: $29.99/month	Compatible with any device that can access a web browser
Scribbr	AI content detector and plagiarism checking	Proofreading and editing services start at $161 a page	Scribbr is compatible with various programming languages and platforms
Winston AI	Detecting AI content in text	Free: $0/month Essential: $4.32/month Advanced: $7.17/month Elite: $12.17/month	Compatible with a range of AI writing tools, including ChatGPT, GPT-4, and Google Gemini

Let's explore the best AI content detector tools in detail:

GPTZero

Introduction

GPTZero is one of the best AI detection tools to evaluate for education-focused workflows and is widely used in education, with more than 19 million users and adoption across 3,500 colleges. It reports an overall AI score and highlights the specific sentences it suspects, which is more defensible than a single document-level percentage. The company is now part of Superhuman, and it has expanded beyond detection to include hallucination checking, plagiarism, and writing-process verification. You can use this AI content detector by adding a Google Chrome extension or using the tool directly on its official website. It can also provide examples to help you understand the difference between AI-generated and human content.

Key Feature

Writing Replay records the drafting process in Google Docs, including copy-and-paste events and typing patterns.
Sentence-level highlighting with an explanation of why each passage was flagged.
Hallucination Detector checks factual claims rather than authorship.
LMS integrations for Canvas and Google Classroom, plus a Chrome extension and API.

Pros & Cons

Pros

The most generous free tier here at 10,000 words a month with no card required.
Explicitly de-biased for English as a second language, with a stated 1% false positive rate for ESL writing.
SOC 2 Type II audited and compliant with FERPA, GDPR, and CCPA.
Writing Replay gives students a way to prove authorship rather than only being accused.

Cons

Pricing

Free: 10,000 words/month
Premium: $23.99/month
Professional: $45.99/month

Sapling.ai

Introduction

Sapling is a language platform built by former Google, Stanford, Meta, and Berkeley researchers, and its AI detector is one component, not the whole product. The free web checker accepts short passages, making it useful for quick verification. Its real audience is developers, since the detector is available as an API that can be wired into a CMS or a submission workflow. This is one of the best AI content detectors of 2026 because it’s an all-in-one tool that helps you write, correct your grammar and identify sections that may or may not sound like AI-generated content.

Key Feature

Detector available as an API alongside the web tool, with character-based quotas.
Sentence-level probability scores rather than a single document verdict.
Self-serve API with a $5 minimum, which is the cheapest API entry in this guide.
Grammar checking and autocomplete built into the same platform.
Browser extension that works across web applications.

Pros & Cons

Pros

Don’t need an account to check short paragraphs
API pricing is transparent and self-serve rather than routed through sales.
Writing assistance, grammar checker, and AI detection are all bundled into the same platform, so you don’t need to open multiple tabs to go about these processes.
Annual billing roughly halves the Pro price.

Cons

Pricing

Free: unlimited checks up to 2,000 characters.
Pro: $25/month
Enterprise: from 10 seats at $15 per user/month

Pangram

Introduction

Pangram is a relatively newer entrant here, built around one claim: false positives matter more than raw detection rate. Independent testing at the University of Chicago found it to be one of the four detectors to meet a strict false-positive cap. That focus makes it the safest option when a flag could affect someone’s grade or job. To achieve this, it analyzes underlying stylistic structures rather than raw word predictability, significantly reducing bias against non-native English writers. The platform also provides sentence-level heatmaps to make flagged sections explainable during appeals, though its cautious design means heavily humanized AI text is more likely to pass undetected.

Key Feature

Optimized for low false positives rather than maximum detection.
Image scanning on every plan: 3 a day free, 100 a month on Individual, 500 on Professional.
API usage is billed per word, and Professional includes $200 of API credits monthly.
Word-based quotas rather than credits, so the cost per document is easy to predict.

Pros & Cons

Pros

Cons

Pricing

Free: 2,000 words a day.
Individual: $20/month
Professional: $65/month
Team: $40/month

Undetectable AI

Introduction

Undetectable AI belongs on this list with a caveat stated up front, because its main product rewrites AI text so that detectors miss it. The detector is the smaller half of the tool, and it exists mainly so users can check their rewrite before publishing. It aggregates results from several third-party detectors into one view, which is genuinely useful as a second opinion even if you never use the humanizer.

Key Feature

Aggregated detection that runs text past several detectors at once and shows each result.
Humanizer with tone settings covering academic, casual, and marketing registers.
Chrome extension that checks text inside the page you are writing in.
Bulk processing for multiple documents on higher tiers.

Pros & Cons

Pros

The aggregated view is a fast way to see whether detectors disagree on a passage.
The basic tier is cheaper than most of the AI detection tools mentioned on this list.
Annual billing halves the monthly cost.
Useful for writers who want to test their own work before a client does.

Cons

Pricing

From $19/month for 20,000 words
annual plans start at $5/month, billed annually

Turnitin

Introduction

Turnitin is a very popular AI content detector tool that universities and colleges use. It’s usually built into submission systems directly, and its AI writing indicator now sits inside the same similarity report. That distribution is its real advantage. No individual can buy it, which is the trade-off. Unlike its counterparts, students cannot scan their texts prior to submitting their documents. Every submission is evaluated blindly, unless the institution has feedback enabled.

Key Feature

AI writing indicator integrated into the existing similarity report rather than run separately.
Native integrations with Canvas, Moodle, Blackboard, and other learning management systems.
Institution-wide reporting so administrators can see patterns across cohorts.
Retains submitted work in a repository that future submissions are checked against.

Pros & Cons

Pros

Already deployed at most universities, so there is nothing new for staff to learn.
Results arrive alongside plagiarism scoring in one report.
Built for institutional record-keeping and appeals rather than casual checking.
Long track record in academic integrity work.

Cons

Pricing

No public price. Sold to institutions by quote only

Smodin

Introduction

Smodin is a general writing platform with the AI content detection tool attached rather than being a detection specialist. Students are the core audience, and the AI checker sits alongside a plagiarism checker, a rewriter, a citation generator, and a research assistant. That bundle is why people choose it, since one subscription covers several tasks that would otherwise require separate tools.

Key Feature

AI detection and plagiarism checking run from the same interface.
Multilingual support across a wide set of languages, which is broader than most detectors here.
Rewriter and citation tools bundled into the same subscription.
Chrome extension for checking text without leaving the page.

Pros & Cons

Pros

Cons

Pricing

Starter: $12.99/month
Premium: $19.99/month

Proofademic

Introduction

Proofademic is a detector built specifically for academic writing, on the argument that general-purpose detectors misread formal academic prose. Its reports give sentence-level scores and a color-coded heat map rather than a single percentage, which is the right shape for a result that someone may need to appeal. The company reports a 0.2% document false positive rate from its own March 2026 evaluation across 4,200 human-authored academic texts.

Key Feature

Models trained on academic writing patterns rather than general web text.
Paraphrase Shield, aimed at catching AI text that has been rewritten.
Batch Scan for uploading a full set of submissions at once.
Coverage across 23 languages, plus an image detection API for institutions.

Pros & Cons

Pros

Sentence-level heat map makes the result explainable rather than a bare score.
Free tier needs no card, which matters for individual teachers.
Academic calibration reduces the false positives that formal writing triggers elsewhere.
Batch Scan suits marking a class set rather than checking one document.

Cons

Pricing

Free: 1,000 words per scan.
Essential: $15/month
Premium: $25/month
Professional: $45/month

Originality.ai

Introduction

Originality.ai is an AI content detector for publishers, agencies, and authors that provides a full-featured content authenticity suite. Although it offers AI detection, plagiarism detection, and fact-checking, it necessitates a credit card subscription and is not suitable for students. The platform offers three AI detector options (Lite, Turbo, and Multi-language) for a wide range of applications and tolerance levels to AI-based content.

Key Feature

Always tops the independent AI detection accuracy tests
Uniquely recognizes articles copied using software such as Quillbot
Scans entire sites for ad-free content with a single click
Manage teams, scan history, and publish results, with no limit on character size, tags, and API support
The system achieves industry-standard false positive rates (less than 1% for Lite), thereby preventing false positives from identifying the human-written content. Offers AI detectors to combat infrequent false positives
Lite (98% false positive, 99%+ accurate, strong against cheats) and Multi-Language (15 languages)

Pros & Cons

Pros

Cons

Pricing

Pro Plan- $14.95/month
Enterprise Plan-$179/month

Copyleaks

Introduction

With over 30 million scans, Copyleaks is a plagiarism and AI detection tool that is utilized in over 100 countries by 1,000+ institutions and 300+ enterprises. It offers a comprehensive suite of AI detectors designed to ensure content originality and authenticity. The tool also introduced advanced AI logic and moderation features to provide deeper insights into flagged content and support safe, compliant content creation.

Key Feature

Copyleaks stands out due to several key features:

This first-of-its-kind, patent-pending technology not only identifies AI-generated content but also elucidates its identification, offering significant insights into AI patterns and traces.
Its customizable API allows seamless integration into various platforms, offering scalable solutions and tailored reporting for organizations.
Copyleaks easily integrates with Learning Management Systems (LMS), empowering educational institutions to promote originality within their learning environments.
Prioritizing data security and privacy, Copyleaks is GDPR compliant and holds SOC 2 and SOC 3 certifications, ensuring the highest levels of protection.

Pros & Cons

Pros

User-friendly interface
Rapid scanning speed
Supports multiple languages
Detects AI-generated content
Handles various file formats
Integrates with LMS platforms
High level of security and compliance

Cons

Pricing

Copyleaks offers various plans:

Personal- $16.99/month
Pro- $99.99/month
Enterprise- Talk to sales
Education- Talk to sales

ZeroGPT

Introduction

For readers comparing the best free AI content detector 2026 options, ZeroGPT is worth considering because it checks text for free with no account. Paste a passage, and it returns an AI percentage with the suspected sentences highlighted, which is more useful than a single score. Around that detector sits a set of free writing utilities covering plagiarism, paraphrasing, summarising and translation. The trade-off is transparency. ZeroGPT publishes an accuracy claim but very little about how the model works or how it was tested, so it suits quick personal checks rather than decisions that affect someone. Reports can be exported as PDF, which helps when you need a record.

Key Feature

ZeroGPT stands out with a few unique aspects:

Promptly highlights AI-selected sentences in a text, showing the percentage of AI words.
The tools include a plagiarism checker, paraphraser, AI content checker, summarizer, grammar checker, translator, and writing assistant.
Uses a multilingual, fully automatic AI detection model to provide an extremely accurate AI detector text and good performance.
Prints PDF reports for each detection—verifiable evidence of non-AI or non-piracy content.
Correctly detects A.I. in several languages.
The system uploads multiple files simultaneously for effective analysis.

Pros & Cons

Pros

Cons

Pricing

Free- $0/mo
Pro- $13.99/mo
Plus- $22.99/mo
Max- $29.99/mo

Pricing is determined by word count.

Scribbr

Introduction

Scribbr is an academic support platform rather than a detection company, and its AI detector is one tool among proofreading, plagiarism checking, and citation generation. That framing matters. Students use it to check their own work before submission rather than to judge someone else’s, which is the healthier use of any detector. The free detector allows unlimited checks of up to 1,200 words but only covers older models. The premium detector comes as an add-on to the paid plagiarism check.

Key Feature

Below are some of the most useful aspects of Scribber:

Scribbr offers you proofreading and editing services from academic editors to ensure perfect and error-free writing—grammar, style, and spelling.
A plagiarism checker is used to identify accidental plagiarism and rectify work before publishing. It matches up with a database of thousands of sources.
Scribbr’s citation generator makes it easy to produce the right APA citations and save yourself hours of formatting references.
This option filters text generated by artificial writing machines for academic honesty and novelty.
A handy guide to many aspects of academic writing, such as style and citation techniques.

Pros & Cons

Pros

Cons

Pricing

Scribbr’s pricing varies tremendously with the selected service. For instance, professional proofreading and editing starts at $161 a page. Other providers, like plagiarism checkers, have their own pricing models.

Winston AI

Introduction

Winston AI targets educators, publishers, and agencies with a detector that returns a human score alongside a sentence-level breakdown. It handles images and scanned documents through OCR, including handwriting, which not every competitor offers and which matters for handwritten or printed submissions. Reports are detailed enough to share with a student or client, and teams can pool credits across an account. Language support is the main limit, since coverage is narrower than tools built for multilingual publishers. The company markets a 99.98% accuracy figure, which is its own testing rather than an independent result.

Key Feature

Here are a few important features:

Detect AI-generated content from AI models such as ChatGPT, GPT-4, and Gemini with 99.98% accuracy.
It eliminates text from images and documents, expanding the scope of detection beyond mere text input.
Relocates potential AI-generated parts in the text for easy reading.
Features in-depth reports, with breakdowns and scoring, printable for documentation.
Facilitates credit sharing and group utilization to enhance team productivity
Indicates how human-written the text appears to be.

Pros & Cons

Pros

Cons

Pricing

Free- $0/month
Essential- $4.32/month
Advanced- $7.17/month
Elite- $12.17/month

Quick Guide On Best AI Detection Tools

What is an AI Detector and Why Do You Need It?

The best AI detection software uses artificial intelligence to scan a text and determine whether it was written by a person or an algorithm. It flags up possible copyright or automated material and checks the reliability of the text. This is essential to combating fake news and maintaining academic integrity.

AI text detectors function by analyzing text morphology—sentence structure, word choice, stylistic peculiarities—against a catalogue of previously identified AI outputs. This synthesis shows the likelihood of AI authorship.

best ai content detection tool is a requirement in many domains. School teachers deploy it to check student work for AI-based misinformation and preserve academic quality. Creators use it to prove authenticity. Fact-checkers use it to counter online lies.

AI detection is useful in various industries. Teachers review the textbooks; reporters proofread the stories; advertisers check the authenticity of the content; lawyers review the legal papers; social media filters the AI-inspired spam; research universities maintain the quality of their data. Finally, if authenticity and originality are the most important factors, an AI detector is a must-have tool.

How Do Best AI Content Detectors Work?

AI content detectors are built with cutting-edge tools such as machine learning and natural language processing (NLP) to separate human-written content from artificial writing. These are tools that use various linguistic traits to detect patterns in AI-written content.

The best ai content detection operation includes matching input text to an encyclopedia of known AI-generated data. That comparison is an exercise in similar sentence form, words, and style. Any discrepancy between the entered text and the style of human scribbling issues a warning. The more stark these anomalies, the more likely AI authorship.

These AI detection packages employ several methods. It also creates language models, which, like the machines that drive AI writing, determine the likelihood that a text will be written by AI. Measures such as perplexity, which measures how unclear the text is, and burstiness, which measures longer or shorter sentences and difficulty, are also taken into consideration; lower scores suggest AI writing.

Next, n-grams are used to analyze the number of word sequences. Simple arrangements hint at generating AI. Finally, cross-reference to third-party databases and analysis of context tell you whether the text belongs in its place or not. The combination of these approaches makes for a more precise and stable analysis.

How To Choose An AI Detection Tool?

Here are some tips for selecting the best AI content detection tools.

As the need for tools for detecting AI content grows, it necessitates the development of effective content detection mechanisms. To identify and process properly, choosing the right tool involves thinking carefully about a few considerations.

Detection accuracy

Accuracy is paramount. Look beyond simple advertising to independent comparisons and testimonials. It needs a high detection rate to verify that the tool correctly recognizes AI-generated text. A small false positive rate is also important for avoiding misidentifying human-written content. AI detector tools that allow for open testing and publicly downloadable accuracy metrics provide more assurance.

Ease of use and integration with CMS

The tool’s interface should be simple to understand. Easy integration with your existing content management system (CMS) automates the process. Think about bulk uploading, automatic reporting, and easy-to-read reports. An intricate tool hinders productivity, but a simple interface maximizes it.

Advanced features

For more sophisticated scenarios, you can look at specialized AI model detection (GPT-3, Bard, etc.), detailed analysis reports (with reasons for detection), and APIs to integrate into your current workflows. If you want to identify a particular kind of AI output, or you need data to conduct some research, then the advanced detection features are the best.

Pricing models and availability of free trials

Pricing models vary significantly. Look at everything from free tools with restrictions to paid services with different levels of features and limits. Almost every tool has free trials that you can use to evaluate the performance and ease of use before you purchase. Select a pricing structure and feature set that are suitable for your spending and usage requirements.

How Accurate Are AI Content Detectors?

The AI detector tools have become increasingly popular for identifying machine-generated content. While they provide valuable insights, their accuracy depends on algorithms and training data. These tools often struggle with nuanced, highly edited text or hybrid content. Regular updates and advancements are vital to enhance their reliability for precise content analysis.

How AI Content Detectors Support Different Users

Educators

AI content detectors help teachers to preserve the academic integrity of their teaching by rapidly and effectively flagging AI content in student essays and assignments. This guarantees that the submission reflects the student’s own knowledge and effort, allowing for a more equitable and precise assessment of learning.

Content Creators & Writers

Writers and bloggers utilize AI content detector tools to assure originality while also protecting their own style and voice. By avoiding artificially created content, they avoid being inauthentic and imitating others, earning the trust of their audience and maintaining professional integrity. These are the tools writers employ to hone their craft and deliver human-written texts.

Businesses

Business owners can check how AI content detectors are helping them create marketing content to safeguard brand integrity and creativity. They design marketing materials, websites, and communications to communicate the company’s individuality and resist the trap of generic-made, artificially written AI words. Staying fresh helps retain brand loyalty and the reputation of the business.

Students

Students can use AI content detectors to self-check if they are plagiarizing their material or not. It prevents accidental copying in advance and encourages beneficial academic practices. Moreover, it can enhance students’ writing skills by identifying topics that lack originality or interest and encouraging improved writing habits and abilities.

Can Google Really Detect AI Content?

Wanted to know can Google detect AI content? Google would have sophisticated NLP and machine learning algorithms in place to flag AI material, checking for things like sentence structure, words, and syntax. AI detectors are also consistent with Google’s interest in high-quality, original content because they enable creators to locate AI-generated texts that could violate regulations. This helps to create human-written content that adds value and meets Google’s requirements for search rankings.

Future of AI Content Detection: Shaping the Digital Industry

The way AI content detectors are shaping the digital industry will fundamentally alter our approach to creating, reading, and trusting online content. New trends indicate far greater accuracy and granularity than ever before, from AI/human-generated text categories to the identification of specific AI-generated parts of text. Explainable AI (XAI) will bring transparency and trust by providing the logic behind detection flags.

Multimodal analytics will expand beyond text to include images, videos, and audio, assisting in the fight against deepfakes and other manipulative media. Developers can incorporate subtle identifiers into AI-generated content, making it easy to identify, thanks to the proactive nature of the new watermarking technology.

The use of real-time detection will only become more important as AI creation increases, allowing platforms to respond rapidly to content problems. Adaptive algorithms will be the key to staying ahead of new ways to create AI.

This evolution will fight fake news, secure intellectual property, and promote more human-generated content. For content producers, it’s going to require some retraining to produce meaningful, human-written content. However, there are still struggles between AI production and detection, the necessity to minimize false positives, and the moral dilemma of detection vs. user privacy.

Final Thoughts

AI detector tools will continue to change in a constantly evolving competition with the ever-more advanced AI generation methods. Future improvements in accuracy, explainability, and multi-modal analysis are likely to address the challenges of advancing AI models. The significance of these detectors cannot be overemphasized; they are crucial to maintaining huma-written content authenticity, countering fake news, ensuring academic honesty, and securing intellectual property. By guaranteeing content originality, they protect information’s integrity in the online world.

FAQs

What is the difference between AI score and human score?

They are two sides of the same estimate. An 80% AI score usually means a 20% human score, so a tool showing both is essentially presenting the same number twice.

What is a false positive in AI detection, and how common is it?

A false positive is human writing flagged as AI. Rates vary by tool and by writer, and they rise sharply for non-native English speakers and for heavily edited text.

Do AI content detectors get less accurate over time as AI models improve?

Yes, unless the detector is retrained. Each new model generation writes less predictably, which is exactly what detectors measure, so tools need regular updates to keep pace.

Is there a "safe" AI score, or any score below which content is considered human?

No. Vendors set their own thresholds, and none of them is a standard. Treat any score as evidence to weigh rather than a pass mark.

Is it safe to paste unpublished or confidential work into a free AI checker?

Often not. Free tools frequently retain submitted text, and some reserve the right to use it. Check the privacy policy before pasting anything under embargo or NDA.