# TopPDF vs ZeroGPT TopPDF records 643 monthly visits with -90.6% month-over-month growth and Freemium pricing. ZeroGPT records 32,864,541 monthly visits with +19.7% growth and Freemium, Paid pricing. | Metric | [TopPDF](https://openaitools.app/tool/toppdf) | [ZeroGPT](https://openaitools.app/tool/zerogpt) | | :--- | :--- | :--- | | Website URL | https://www.toppdf.co | https://www.zerogpt.com | | Categories | AI PDF, AI PDF Editor, AI Translate, AI Grammar Checker | AI Content Detector, AI Detector, AI Checker, AI Plagiarism Checker | | Pricing Model | Freemium | Freemium, Paid | | Monthly Visits | 643 | 32,864,541 | | MoM Growth Rate | -90.6% | +19.7% | | Primary Market | Global | United States | | Direct Visits | 230 | 8,220,007 | | Review Score | 3.9 | 3.8 | | Saved Count | 1 | 31 | | Supported Platforms | Website | Website | ## TopPDF TopPDF is a browser-based toolbox that concentrates the document tasks people do most often into one place. You can edit text and images inside a PDF, translate a document while trying to keep its layout, compress files for easier sharing, merge several PDFs into one, or split a large file into smaller pieces. A converter handles two-way movement between PDF and Word, Excel, PowerPoint and JPG, with EPUB to PDF on the import side as well. Beyond conversion, the platform adds light AI writing help: a grammar checker that detects grammatical and spelling issues across multiple languages, and a paraphrasing tool for rewriting passages quickly. OCR support means scanned or image-based documents can be turned into searchable, editable files, which is often the deciding factor for anyone working with older or printed material. TopPDF says it is used by more than 8 million people and has processed over 150 million PDFs, and the interface is offered in a wide range of languages. Access is freemium: the core utilities can be tried without an account, while a subscription unlocks larger files and more advanced editing. Because pricing is presented inside the product rather than on a public page, it is worth checking current plans in the app before committing. **Pricing & Plans:** Freemium. Core PDF tools such as editing, conversion and compression can be used for free with limits, while a paid subscription unlocks larger files, advanced editing and higher usage volumes. Exact plan prices are shown inside the product rather than on a public pricing page, so check the app for current tiers. - **PDF editing and translation:** Modify text and images directly inside a PDF and translate document content into many languages while keeping the original page layout intact. - **Compress, merge and split:** Shrink, merge and split PDFs so large documents are easier to store, share and organise, with compression that aims to preserve visible quality. - **Two-way format conversion:** Convert PDFs to Word, Excel, PowerPoint and JPG, and convert Word, Excel, PowerPoint, JPG and EPUB back into PDF. - **AI grammar checker and paraphraser:** An AI grammar checker that finds grammatical errors and spelling mistakes across multiple languages, plus a paraphrasing tool for fast rewriting. - **OCR for scans:** OCR support turns scanned or image-based documents into editable, searchable formats so printed material can be reused digitally. **Strengths:** Wide all-in-one toolkit covering editing, conversion, compression and translation; Two-way conversion between PDF and Word, Excel, PowerPoint and JPG; Multi-language interface and a PDF translator covering many languages; OCR makes scanned and image-based documents editable **Limitations:** Some advanced features and larger files sit behind a paid subscription; No visible pricing page makes cost comparison harder before signing up; Heavy PDFs with complex layouts may still need manual fixes after conversion; Site language switcher covers many languages but the interface focus is document conversion rather than a wider productivity suite [Profile (Markdown)](https://openaitools.app/tool/toppdf.md) ## ZeroGPT ZeroGPT is best known as an AI content detector, but the site has expanded into a full writing and verification toolkit. The core AI/GPT detector lets you paste text or upload a file and returns a highlighted analysis showing which sentences look machine-written, with a percentage gauge and an automatically generated PDF report you can use as documentation. Around that core sit several companion detectors and writers. The AI image detector and AI video detector extend checking beyond text; the plagiarism checker scans against billions of sources; and the AI humanizer and paraphraser rewrite text into a more natural style. A grammar checker, summarizer, translator, dictionary, word counter, citation generator, and AI email helper round out day-to-day writing tasks. The company says its multi-stage DeepAnalyse model is trained on internet text, educational datasets, and proprietary synthetic AI datasets, covers over 35 LLM families, and reports 98.4% detection accuracy with a false positive rate under 1%. Access is freemium: the main tools work free in the browser, with MAX and EXPERT subscriptions for heavier use and premium features, and a separate API for organizations that need large-scale integration. ZeroGPT also runs on WhatsApp and Telegram through a bot, letting you chat, detect AI text, summarize, paraphrase, translate, and check grammar without leaving the messaging app. **Pricing & Plans:** Freemium with paid tiers. Core tools such as the AI detector, summarizer, and grammar checker are usable free in the browser, while MAX and EXPERT subscriptions unlock higher limits and premium features, and API access is sold separately for organizations. - **AI and ChatGPT detection:** Paste up to 15,000 characters or upload a file and get a highlighted breakdown of which sentences appear AI-written, plus an overall percentage score and a downloadable PDF report. - **AI image and video detection:** Beyond text, ZeroGPT offers an AI image detector and an AI video detector that performs frame-level analysis to flag generated or manipulated visuals. - **Plagiarism checking and humanizing:** Compare your text against billions of sources through the plagiarism checker, or rewrite and humanize AI text with the paraphraser and AI humanizer while keeping the original meaning. - **Writing and productivity tools:** A bundled writing suite covers summarization, grammar and spelling correction, translation across many languages, a dictionary, word and character counting, citation generation, and an AI email writer. - **API for organizations:** A documented REST API exposes detection, plagiarism, paraphrasing, summarization, grammar, chatbot, and translation endpoints for organizations that need to embed ZeroGPT at scale. **Strengths:** Free browser access to the core AI detector, summarizer, and grammar checker; Sentence-level highlighting with an overall percentage and exportable PDF reports; Extends beyond text to AI image and video detection, plus plagiarism checking; Broad companion toolkit: humanizer, paraphraser, translator, dictionary, citations, email helper **Limitations:** AI detectors can produce false positives, so results should be treated as a signal rather than proof; The strongest features sit behind MAX/EXPERT paid tiers and API access is a separate purchase; Character limits apply to the free detection box; No detection tool can guarantee correctness across every model and language [Profile (Markdown)](https://openaitools.app/tool/zerogpt.md) ## Frequently Asked Questions ### How do TopPDF and ZeroGPT compare in monthly traffic? TopPDF has 643 monthly visits, while ZeroGPT has 32,864,541. Traffic estimates describe audience size, not product quality. ### How do their growth rates compare? TopPDF has a month-over-month growth rate of -90.6%; ZeroGPT has +19.7%. ### How does pricing compare? TopPDF: Freemium. Freemium. Core PDF tools such as editing, conversion and compression can be used for free with limits, while a paid subscription unlocks larger files, advanced editing and higher usage volumes. Exact plan prices are shown inside the product rather than on a public pricing page, so check the app for current tiers. ZeroGPT: Freemium, Paid. Freemium with paid tiers. Core tools such as the AI detector, summarizer, and grammar checker are usable free in the browser, while MAX and EXPERT subscriptions unlock higher limits and premium features, and API access is sold separately for organizations. ## Alternatives | # | Tool Name | Monthly Visits | MoM Growth Rate | Pricing Model | Summary | Profile (Markdown) | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | 1 | [Grammarly](https://openaitools.app/tool/grammarly) | 58,867,412 | -1.5% | Freemium | Cross-platform writing assistant focused on real-time grammar and tone correction rather than AI content detection. | [.md](https://openaitools.app/tool/grammarly.md) | | 2 | [QuillBot Paraphraser](https://openaitools.app/tool/quillbot-paraphraser) | 36,630,337 | +2.3% | Freemium | Popular paraphrasing assistant focused on rewriting and grammar correction, but lacks dedicated AI detection scanners. | [.md](https://openaitools.app/tool/quillbot-paraphraser.md) | | 3 | [GPTZero](https://openaitools.app/tool/gptzero-me) | 23,246,989 | +32.5% | Freemium, Paid | Industry-standard AI content detection trusted by educators, offering robust sentence-level analysis similar to ZeroGPT. | [.md](https://openaitools.app/tool/gptzero-me.md) | | 4 | [Scribbr](https://openaitools.app/tool/scribbr) | 7,530,803 | +14.6% | Freemium | Academic editing platform pairing AI plagiarism detection with professional human proofreaders for student papers. | [.md](https://openaitools.app/tool/scribbr.md) | | 5 | [Image to Text](https://openaitools.app/tool/image-to-text-converter) | 4,871,767 | +0.8% | Freemium | Free online OCR that turns any image into editable text in seconds | [.md](https://openaitools.app/tool/image-to-text-converter.md) | | 6 | [Undetectable AI](https://openaitools.app/tool/undetectable-ai) | 3,113,403 | +17.5% | Freemium | Combines reliable AI detection with advanced text humanization tools to rewrite machine-generated content naturally. | [.md](https://openaitools.app/tool/undetectable-ai.md) | | 7 | [PDFgear](https://openaitools.app/tool/pdfgear) | 2,845,280 | -3.4% | Free | A free, AI-powered PDF editor for every device | [.md](https://openaitools.app/tool/pdfgear.md) | | 8 | [Copyleaks](https://openaitools.app/tool/copyleaks) | 2,402,494 | -14.1% | Paid, Contact for Pricing | Enterprise-grade content verification suite detecting AI text, images, and source code across multiple languages. | [.md](https://openaitools.app/tool/copyleaks.md) | | 9 | [PDNob PDF Editor](https://openaitools.app/tool/pdnob-pdf-editor) | 2,376,518 | +1.2% | Freemium, Free Trial, Paid | AI-powered PDF editor for Windows, Mac and iOS | [.md](https://openaitools.app/tool/pdnob-pdf-editor.md) | | 10 | [Originality.ai](https://openaitools.app/tool/originality) | 2,049,639 | +2.8% | Paid | Comprehensive content integrity platform specialized in accurate AI detection and plagiarism checking for digital publishers. | [.md](https://openaitools.app/tool/originality.md) | --- Source: https://openaitools.app/compare/toppdf-vs-zerogpt More Markdown: [Categories](https://openaitools.app/categories.md) · [Traffic rankings](https://openaitools.app/rankings.md) · [llms.txt](https://openaitools.app/llms.txt)