# ChatPDF vs LightFill

ChatPDF records 1,044,477 monthly visits with -3.7% month-over-month growth and Freemium pricing. LightFill records 0 monthly visits with — growth and Contact for Pricing pricing.

| Metric | [ChatPDF](https://openaitools.app/tool/chatpdf) | [LightFill](https://openaitools.app/tool/lightfill) |
| :--- | :--- | :--- |
| Website URL | https://www.chatpdf.com | https://chromewebstore.google.com/detail/lightfill/hfjglbjcneghejbdakkleggpefippgjj |
| Categories | AI PDF, AI Chatbot, AI PDF Summarizer, AI Summarizer | AI Forms, AI Document Extraction |
| Pricing Model | Freemium | Contact for Pricing |
| Monthly Visits | 1,044,477 | 0 |
| MoM Growth Rate | -3.7% | — |
| Primary Market | United States | Global |
| Direct Visits | 457,792 | 0 |
| Review Score | 4.2 | 3.5 |
| Saved Count | 279 | 1 |
| Supported Platforms | Website | Browser Extension |

## ChatPDF

ChatPDF started as a simple "chat with your PDF" utility and has grown into a full research and study workspace. You can drop in a PDF, Word document, PowerPoint deck, Markdown or text file, paste a link, or point it at a YouTube video, then ask questions in natural language. Answers are grounded in your sources and come with clickable citations so you can verify anything straight from the original page.

Beyond one-off Q&A, the platform supports folders and multi-file chats, so you can query a whole reading list at once and compare findings across documents. A side-by-side layout keeps the conversation and the document open together, while translation lets you read material in another language or ask questions in a language different from the source. The team has expanded the suite with an AI writer, AI detector, flashcards, slide generation, and a dedicated research mode.

Access is browser-based and device-agnostic, with desktop and mobile apps available. The free tier covers a limited number of documents per day with no sign-up required for the core experience, while the paid Plus plan removes limits and unlocks advanced features. Enterprise-grade handling (SSL in transit, encrypted storage, SOC 2 Type II storage provider) is advertised, and users can delete their documents at any time.

**Pricing & Plans:** Freemium. A free tier lets you analyze a limited number of documents per day, and the core chat experience works without creating an account. ChatPDF Plus is a paid subscription that adds unlimited document analysis and advanced features — check the site for current plan details and regional pricing.

- **Cited answers:** Every response is anchored to your source document with clickable citations that scroll to the exact passage, so verification takes seconds instead of page-by-page searching.
- **Multi-file chat and folders:** Organize documents into folders and query many files in a single conversation to compare arguments, cross-reference findings, or study a whole syllabus at once.
- **Summarization and translation:** Condense long papers, reports, and contracts into key takeaways, and translate or query documents in any language — including mixing a source language with a different question language.
- **Study and writing tools:** Generate flashcards and slide decks from your material, and use the built-in AI writer and AI detector for drafting and checking academic text.
- **Side-by-side reading view:** Keep the chat panel and the PDF open together so answers stay linked to the original content while you read along.

**Strengths:** Answers include clickable citations tied to the original page, which makes fact-checking straightforward; Works with PDFs, Word, PowerPoint, Markdown, text, YouTube links, and web pages in one place; No account needed to try the core chat experience, and the free tier covers light daily use; Multilingual: upload in one language and ask questions in another

**Limitations:** The free plan caps how many documents you can analyze each day; Advanced features such as unlimited analysis and the full study toolkit sit behind the paid Plus subscription; Very large documents or heavy multi-file sessions can be slower and may hit size limits

[Profile (Markdown)](https://openaitools.app/tool/chatpdf.md)

## LightFill

LightFill targets a very specific annoyance: you have the document and you have the form, and the only thing in the way is re-typing data that already exists. The extension is designed to close that gap. Instead of copying a passport number or an invoice total across by hand and hoping you did not transpose two digits, you let the extension extract the values with AI-based document processing and fill the form for you in one action.

Its developer describes support for a range of document and form types — identity papers, passports and invoices are the examples given — with the goal of working across the many layouts administrative and purchasing forms come in. Because the extension touches identity documents, the listing emphasises security protocols for protecting personal data, and the developer's disclosure notes that it handles personally identifiable information, financial and payment information, authentication information and website content, while stating the data is not sold to third parties.

It is a small, single-purpose tool rather than a suite: published by an independent developer based in France, listed under Tools, and last updated in 2024. The extension itself is free to install and the store listing notes that it offers in-app purchases. If your work involves paperwork — visa and onboarding forms, expense claims, invoice entry — it is aimed squarely at how much of that day disappears into typing.

**Pricing & Plans:** Free to install from the Chrome Web Store; the listing notes that the extension offers in-app purchases. No standalone public pricing page is published.

- **AI document extraction:** Reads structured values out of ID cards, passports, invoices and other documents instead of asking you to type them.
- **One-click form filling:** Maps extracted values into the fields of the web form you are looking at, so a completed form is one action away.
- **Broad document and form coverage:** Built to handle multiple document layouts and the varied field arrangements of administrative and checkout forms.
- **Time saved on repetitive entry:** Removes the slow, mistake-prone copy-typing that dominates routine paperwork and online purchasing.
- **Security-focused handling:** The developer highlights protection of personal data and discloses which categories of information the extension processes.

**Strengths:** Removes a genuinely tedious, error-prone task with a single click; Handles several practical document types, including ID cards, passports and invoices; Free to install, with the option of in-app purchases as needed; Open about what data categories it processes and states data is not sold to third parties

**Limitations:** Available only as a Chrome extension, so other browsers are not covered; Handling identity and payment documents makes reading its privacy disclosure essential before use; A small independent tool with a limited public track record and no standalone product site

[Profile (Markdown)](https://openaitools.app/tool/lightfill.md)

## Frequently Asked Questions

### How do ChatPDF and LightFill compare in monthly traffic?

ChatPDF has 1,044,477 monthly visits, while LightFill has 0. Traffic estimates describe audience size, not product quality.

### How do their growth rates compare?

ChatPDF has a month-over-month growth rate of -3.7%; LightFill has —.

### How does pricing compare?

ChatPDF: Freemium. Freemium. A free tier lets you analyze a limited number of documents per day, and the core chat experience works without creating an account. ChatPDF Plus is a paid subscription that adds unlimited document analysis and advanced features — check the site for current plan details and regional pricing. LightFill: Contact for Pricing. Free to install from the Chrome Web Store; the listing notes that the extension offers in-app purchases. No standalone public pricing page is published.

## Alternatives

| # | Tool Name | Monthly Visits | MoM Growth Rate | Pricing Model | Summary | Profile (Markdown) |
| :--- | :--- | :--- | :--- | :--- | :--- | :--- |
| 1 | [Claude](https://openaitools.app/tool/claude-2) | 1,253,439,413 | +23.8% | Freemium | Anthropic's frontier AI workspace powered by Claude 5.5 for agentic coding, analysis, and nuanced writing. | [.md](https://openaitools.app/tool/claude-2.md) |
| 2 | [Fillout](https://openaitools.app/tool/fillout-com) | 3,923,917 | -9.7% | Freemium | Build powerful forms, surveys and quizzes with AI in minutes | [.md](https://openaitools.app/tool/fillout-com.md) |
| 3 | [PDFgear](https://openaitools.app/tool/pdfgear) | 2,845,280 | -3.4% | Free | Completely free PDF reading and editing tool with AI assistant, though basic compared to dedicated platforms. | [.md](https://openaitools.app/tool/pdfgear.md) |
| 4 | [LightPDF](https://openaitools.app/tool/lightpdf-com) | 1,742,568 | -15.3% | Freemium | Free AI-powered PDF editor, converter and reader for every device | [.md](https://openaitools.app/tool/lightpdf-com.md) |
| 5 | [UPDF AI](https://openaitools.app/tool/updf-ai) | 1,050,387 | -7.2% | Freemium, Free Trial, Paid | Combines full desktop PDF editing software with AI chat, but requires software installation for full features. | [.md](https://openaitools.app/tool/updf-ai.md) |
| 6 | [PDF.ai](https://openaitools.app/tool/pdf-ai) | 387,819 | -5.5% | Freemium, Free Trial | Includes robust developer APIs for custom document workflows, but free tier limits document page counts. | [.md](https://openaitools.app/tool/pdf-ai.md) |
| 7 | [AskYourPDF](https://openaitools.app/tool/askyourpdf) | 127,733 | +14.1% | Freemium | Strong multi-format document chat and form filling capabilities, but interface can feel slightly more cluttered. | [.md](https://openaitools.app/tool/askyourpdf.md) |
| 8 | [Elephas](https://openaitools.app/tool/elephas) | 76,647 | -14.7% | Freemium | Private AI that answers from your own documents, on Mac and Windows | [.md](https://openaitools.app/tool/elephas.md) |
| 9 | [Sharly AI](https://openaitools.app/tool/sharly-ai) | 65,059 | -10.9% | Freemium | Great for comparing multiple documents and spreadsheets side by side, but smaller overall user community. | [.md](https://openaitools.app/tool/sharly-ai.md) |
| 10 | [Humata AI](https://openaitools.app/tool/humata-ai) | 57,233 | -32.1% | Freemium, Paid, Contact for Pricing | Clean interface for complex technical document summarization, but offers fewer advanced export formatting options. | [.md](https://openaitools.app/tool/humata-ai.md) |

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Source: https://openaitools.app/compare/chatpdf-vs-lightfill

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