ZeroGPT
ZeroGPT is a free AI detector and writing suite. Paste text or upload files and its DeepAnalyse™ model scores the content for ChatGPT, GPT-5, Gemini, Grok, Claude, DeepSeek and Llama text, highlighting each flagged sentence and exporting PDF reports. Plagiarism checking, an AI humanizer, image and video detection, a paraphraser, summarizer, grammar checker, translator, word counter and citation generator sit alongside it. The API supports pay-as-you-go integration.
What is ZeroGPT?
ZeroGPT is a free AI content detector with a suite of writing tools built around it. The main tool accepts up to 15,000 characters per check on the free tier, and up to 350,000 characters on the top paid tier, returning a sentence-by-sentence verdict with each AI-written sentence highlighted and a gauge showing the overall percentage of AI text. The company describes the underlying model as DeepAnalyse™, a multi-stage system trained on internet text, educational datasets and proprietary synthetic AI datasets that targets output from ChatGPT, GPT-3, GPT-4, GPT-5, Gemini, Grok, Perplexity, Claude, DeepSeek and Llama-family models. Published figures are 98.4% detection accuracy, a false-positive rate below 1% and coverage of more than ten LLM families.
Detection is only part of the product. A plagiarism checker scans for duplicate content across what the site describes as billions of sources. An AI humanizer rewrites machine text into a more natural style while keeping the meaning intact. Separate tools assess whether an image or a video looks AI-generated, with the video detector performing frame-level analysis. Writing utilities include a paraphraser with multiple modes, a summarizer, a grammar and spelling checker, a translator, a word counter with reading level and keyword density, a dictionary, a citation generator, an email helper, a background remover and even a Pomodoro timer for focus sessions.
Workflows that matter for record-keeping are covered. Users can upload multiple files in a batch and have them checked automatically in the dashboard, generate a PDF report for each detection to use as documentation, and keep a history of detections on paid plans. ZeroGPT also runs inside WhatsApp and Telegram: register a number or a Telegram code in the dashboard's social settings and use the bot for detection, summarisation, paraphrasing, translation and grammar checks.
Pricing follows a freemium model. The free tier is permanently $0 with no credit card required, and paid subscriptions step from Pro at $9.99 a month on annual billing through Plus and Max, raising detection limits, plagiarism allowances, chatbot prompts and per-check word limits while removing ads. Education and Expert tiers are offered for bulk institutional use, and a pay-as-you-go API prices detection at $0.042 to $0.072 per thousand words across Beginner, PRO and VIP tiers, with plagiarism at $0.41 to $0.52 per thousand words and image detection at $0.01 per image. The operator is Olive Works LLC, reachable at support@zerogpt.com, and enterprise buyers can request a custom contract.
It is worth treating any detector's output as a probability rather than proof, and ZeroGPT's own comparison table notes that free users are subject to standard moderation restrictions while paid plans lift them.
ZeroGPT Core Features
AI text detection
Highlights each sentence written by AI and shows an overall percentage, with detection at document, paragraph and sentence level.
DeepAnalyse™ model
A multi-stage detection pipeline the vendor says targets ChatGPT, GPT-3 to GPT-5, Gemini, Grok, Perplexity, Claude, DeepSeek and Llama output.
PDF reporting and history
Paid plans generate a PDF report for each detection and keep a searchable history of past checks for records.
Plagiarism checker
Scans submitted text for duplicate content across what the site describes as billions of sources, with monthly word allowances by plan.
AI humanizer
Rewrites AI-generated text into a more natural, human-like style while keeping the original meaning intact.
Image and video detectors
Separate tools assess whether an image or a video is AI-generated, with frame-level analysis for video.
Writing toolkit
Paraphraser with multiple modes, summarizer, grammar and spell checker, translator, word counter with reading level, dictionary, citation generator and email helper.
Batch upload and business API
Multiple files can be checked automatically in the dashboard, and pay-as-you-go API tiers cover detection, plagiarism, image detection and the transformer tools.
Who is ZeroGPT for?
ZeroGPT is aimed at anyone who needs a quick, low-friction answer to the question of whether a piece of writing came from a machine, plus the tools to fix or document it. It is free to try, which makes it an easy first stop. Educators and academic staff are the most obvious audience. Teachers, tutors and admissions officers can paste submissions, see sentence-level highlighting that is easier to explain to a student than a single number, and generate PDF reports on paid plans to keep with a case file. Students and researchers use it in the opposite direction: checking their own drafting, running a plagiarism check before submission, and using the summarizer, paraphraser and citation generator while writing. The batch file upload and detection history on paid plans suit people handling many documents at once. Editors, copywriters and content marketers are a strong fit. The toolchain from detection through humanizing, paraphrasing, grammar checking, translation and word counting covers most of a writing workflow, and the plagiarism checker addresses the originality checks agencies are asked to prove. Publishers, SEO teams and community managers use it to screen contributed content and to verify that syndicated copy is not duplicated across what the site describes as billions of sources. Recruiters, HR and operations teams can screen application text, cover letters and submissions where AI authorship matters, and small businesses use the grammar, email and translation tools as a free alternative to paid writing assistants. Developers and platform teams fit through the business API: detection, image detection, plagiarism and transformer endpoints are priced per thousand words, so ZeroGPT can be embedded in a product. Enterprise buyers get a custom contract with user management and integrations. It is a weaker fit for anyone who needs a definitive verdict, since detection is probabilistic, and for users who need ad-free browsing or high character limits without paying, because the free tier caps each check at 15,000 characters and carries advertising.
ZeroGPT Use Cases
Check whether a submitted essay, article or client draft was written by an AI model.
Generate a PDF detection report to document originality for a publisher, editor or client.
Batch check a folder of documents against ChatGPT, Gemini and GPT-5 detection.
Screen contributed content for plagiarism before publishing it on a site.
Rewrite AI-drafted copy into a more natural tone with the humanizer before publishing.
Paraphrase, summarise and grammar-check long documents inside one browser workspace.
Detect AI-generated images or video frames submitted as original photographic evidence.
Embed detection and plagiarism checks into your own product through the business API.
ZeroGPT Pros and Cons
Pros
- Free tier is genuinely usable: 15,000 characters per detection at $0 forever with no credit card required.
- Sentence-level highlighting and a percentage gauge make results easy to explain to students, writers and clients.
- Wide companion toolset in one place, covering plagiarism, humanizing, images, video, paraphrasing, summarising, grammar and translation.
- Practical extras for institutions: batch file uploads, PDF reports, detection history, priority support and a documented pay-as-you-go API.
- Broad model coverage is claimed and named explicitly, spanning ChatGPT, GPT-5, Gemini, Grok, Perplexity, Claude, DeepSeek and Llama families.
Cons
- Detection is probabilistic, not proof: the 98.4% accuracy and sub-1% false-positive figures are the vendor's own claims and results can vary by text type.
- The free tier is limited and ad-supported: 15,000 characters per check, no batch files, no PDF reports and restricted moderation handling.
- Paid pricing is tiered and dense: Pro, Plus, Max, EDU, Expert, three API tiers and credit-based top-ups make the right plan hard to pick quickly.
FAQ About ZeroGPT
ZeroGPT Pricing
ZeroGPT is freemium: a permanent free tier allows 15,000 characters per AI detection at $0, with paid plans from $9.99 a month on annual billing, maximum tiers at $20.99 a month on annual billing, and pay-as-you-go API rates from $0.042 per thousand words for detection.
Check official pricingFree
15,000 characters per AI detection, no batch files or PDF reports, a one-off plagiarism allowance, and the writing tools with advertising.
Pro
Annual billing: 100,000 characters per detection, 50 batch files, PDF reports, 750 plagiarism words, 2,000 prompts in ZeroCHAT-4 and ad-free use.
Plus
Annual billing: 100,000 characters per detection, 60 batch files, 35,000 plagiarism words per month, 100 detections and 2,000 chatbot prompts.
Max
Annual billing: 150,000 characters per detection, 75 batch files, 60,000 plagiarism words, 10,000-word summaries and paraphraser checks, 3,500 ZeroCHAT-5 prompts and unlimited paraphrase modes.
EDU
Education tier listed in the comparison table with 250,000 characters per detection, 80 batch files, 70,000,000 words per year and 4,500 plagiarism detections per year; the price block was not captured.
Expert
Top subscription tier with 350,000 characters per detection, 100 batch files, 15,000,000 words per month and 400 plagiarism detections per month; the site promotes its Max and Expert subscriptions without rendering a price here.
API (Beginner)
Pay-as-you-go API: AI detection at $0.042 per 1,000 words with 50,000 characters per detection, 40 batch files, plus plagiarism at $0.41 and text transformers at $0.042 in and $0.01 out per 1,000 words.
Enterprise
Custom quote covering enterprise-grade subscription terms, security, a user management dashboard and integrations with ZeroGPT's AI solutions.
ZeroGPT Alternatives
GPTZero
GPTZero is an AI content detector built to preserve what is human, trusted by over 17 million users including one million educators. Paste text or upload files to detect writing from ChatGPT, GPT-5, Gemini, Claude, Llama, and DeepSeek with sentence-level highlights, multilingual scans, plagiarism checks, and free grammar and writing feedback. Used in more than 100 countries.
StealthGPT
StealthGPT rewrites AI-generated text into natural, human-sounding writing that bypasses AI detectors such as GPTZero, Turnitin, and Originality.ai. It includes an AI humanizer, a free AI detector, a stealth writer for essays and SEO content, a research agent, chat with PDF, and a Chrome extension, plus API, MCP, Zapier, and WordPress integrations.
Mask AI
Mask AI is an AI humanizer that converts AI-generated text into natural, human-sounding content designed to pass leading AI detectors like Turnitin and GPTZero. It also includes an AI detector, plagiarism checker and remover, and an AI writer, making it a complete toolkit for students, writers, and content teams.