ZeroGPT
OLIVE WORKS LLC · Writing · AI Detection
ZeroGPT is a free AI content detector and writing toolkit. It estimates how much of a text was AI-generated, highlights the AI-like sentences, and adds plagiarism, humanizing, and summarizer tools.
About ZeroGPT
What Is ZeroGPT
ZeroGPT is a web-based AI detector that tells you how likely a piece of writing came from a large language model. You paste or upload text, and it returns an overall score plus sentence-by-sentence highlighting, so you can see exactly which passages look machine-written rather than getting one blunt percentage. People treat it as a ChatGPT detector, but it's built to catch other models too.
The broader product is a suite. Alongside the detector, ZeroGPT bundles a plagiarism checker, an AI humanizer, a paraphraser, a summarizer, a grammar and spell checker, a translator, and a chatbot called ZeroCHAT-5. Everything runs in the browser, and the core detection tool doesn't require an account.
The limit worth knowing up front is accuracy. ZeroGPT says it pushes toward 98% on its own evaluations, but the company also warns that human writing with a flat, formulaic tone can get flagged. Short snippets below 150 words carry weak signals and produce shakier scores. Treat the result as a flag for review, not a verdict.
Getting Started
- Open zerogpt.com and paste up to 15,000 characters into the detector box, or upload a file.
- Run the check and read the overall AI percentage.
- Scan the highlighted sentences to find the passages driving the score.
- Register for a free account if you want history, batch uploads, and the other tools.
- For heavier use, pick a paid plan or connect the API to your own workflow.
Product Information
A quick look at ZeroGPT's pricing, supported platforms, and performance.
Best for
The users, tasks, and scenarios where this tool fits best.
Users
- Teachers grading essays
- Editors and content managers
- Students learning to write
- SEO and marketing teams
Tasks
- Checking whether a submission was AI-written
- Comparing a draft against existing sources
- Rewriting text so it reads less generic
- Summarizing long documents
- Fixing grammar and spelling
Scenarios
- Reviewing a freelancer's work before payment
- Screening vendor proposals and grant applications
- Auditing a knowledge base or blog archive
- Publishing under a byline that demands original work
Key features
AI detection with sentence-level highlighting
The core tool takes up to 15,000 characters and returns an overall AI percentage, then marks the specific sentences it thinks came from a model. That split matters, because a document can score high on one paragraph and read as human everywhere else. It helps you detect AI-generated text without guessing, and ZeroGPT says the model trains on several LLM families, so it isn't limited to ChatGPT output. It works across all languages.
Plagiarism checker
A separate checker compares your text against existing sources to find matches, which answers a question the AI detector can't. The free tier allows a 300-word one-time check, and paid plans move to a monthly word allowance. Teams that need both checks can run them back to back on the same document.
AI humanizer and paraphraser
The humanizer rewrites AI-generated text to read less like a model wrote it, and the paraphraser reworks sentences while keeping the meaning. The paraphraser offers multiple modes on higher tiers, and the humanizer is the tool people reach for when a flagged draft needs to pass review without a full rewrite.
Summarizer with multiple styles
The summarizer turns a long document into a shorter version and offers more than one summary style, so you can get a tight recap or a fuller one. Word limits per check climb with the plan, from 1,500 words on free up to 20,000 on the top tier. It saves the step of reading a whole report to pull the key points.
AI image and video detectors
Beyond text, ZeroGPT flags AI-generated images and analyzes video at the frame level. Those tools matter as synthetic media gets easier to make, since a written policy about AI content often needs a way to check visuals too. Both sit alongside the text detector in the same dashboard.
ZeroCHAT-5 and an API
ZeroCHAT-5 is the built-in chatbot, and every paid plan includes a monthly prompt allowance. Separately, ZeroGPT sells pay-as-you-go API access for AI detection, plagiarism, and the text transformers, so a team can fold detection into its own tools. The API bills per 1,000 words and supports batch inference over several files.
Pros and cons
Pros
- The core AI detector is free and handles 15,000 characters per check without an account.
- Sentence-level highlighting shows which passages drove the score instead of a single number.
- One dashboard covers detection, plagiarism, humanizing, summarizing, grammar, and translation.
- Pay-as-you-go API pricing lets teams integrate detection without a large upfront commitment.
- Works across all languages, which most free detectors handle poorly.
Cons
- Polished human writing can still get flagged, so the score needs human review before it's used to make a call.
- Texts under 150 words give unstable results, which rules out quick spot-checks on short snippets.
- The free plagiarism check is a one-time 300-word limit, so real plagiarism screening means paying.
- The site promotes an AI humanizer, which sits awkwardly next to a tool built to catch AI writing.
Frequently asked questions
Yes. The AI detector is free and checks up to 15,000 characters per run without an account. Paid Personal plans start at $8.99 per month on annual billing and unlock larger batches, PDF reports, and bigger word allowances for the other tools.
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