This is a complete HTML document that creates a client-side PDF comparison tool. It allows you to upload two PDFs, previews their first pages and metadata, extracts text content, and then performs a detailed comparison, highlighting differences. The page includes a professionally formatted article and FAQ section suitable for AdSense. ```html PDF Compare Tool | Professional Document Comparison

📄 PDF Compare Tool

Side‑by‑side document analysis · Intelligent text diff · 100% local & private
📄 Document A PDF 1
⬆️ Select or drop a PDF file
— no file —
📄 Document B PDF 2
⬆️ Select or drop a PDF file
— no file —

⚡ Professional PDF Comparison – Why It Matters

Our PDF Compare Tool delivers advanced, browser‑based document comparison without uploading sensitive files to any server. Whether you're a legal professional reviewing contract revisions, an editor checking manuscript changes, or a student verifying document versions, this tool gives you a line‑by‑line textual diff, metadata preview, and similarity metrics. All processing stays inside your device, ensuring absolute confidentiality.

📌 How the Comparison Works

The tool leverages Mozilla’s PDF.js engine to extract high‑fidelity text from each uploaded PDF. It renders the first page as a visual thumbnail, reads page counts, file sizes, and then extracts the complete textual content (up to all pages). Using the powerful jsdiff algorithm, the system compares both documents line‑by‑line and highlights additions, deletions, and unchanged sections. Additionally, metadata differences (page count, file size) are shown for full transparency.

🔒 Privacy & Security First

Unlike cloud comparison services, this tool operates entirely offline in your browser. No files are uploaded to any external server, and your documents never leave your computer. The technology is ideal for NDAs, confidential reports, and personal data — you retain full control. The only external requests are CDN libraries (PDF.js, diff) which are open‑source and static.

✨ Key Features

  • ✔️ Visual thumbnail preview (first page of each PDF)
  • ✔️ Page count & file size comparison
  • ✔️ Intelligent diff highlighting: added (green) / removed (red) lines
  • ✔️ Similarity score based on text content
  • ✔️ Client-side, no upload, no data traces
  • ✔️ Supports multi-page text extraction (up to entire document)

❓ Frequently Asked Questions

🔹 Does the tool compare scanned/image PDFs?
The comparison extracts raw text content. If your PDFs are scanned images without OCR layer, the tool will show little or no text. We recommend using OCR‑processed PDFs for best results. For scanned documents, consider optical character recognition first.
🔹 Is there any file size limit?
Since everything is processed in your browser, large PDFs (100+ pages) may take a few seconds to extract. For stability, we recommend files under 80 MB. The tool extracts text progressively, and performance depends on your device.
🔹 Are my PDFs uploaded to the internet?
Absolutely not. The entire comparison happens locally — file reading, text extraction, and diff generation are done using JavaScript in your browser. No data is transmitted. Perfect for sensitive documents.
🔹 What exactly does “text diff” show?
The tool compares the combined text content (line breaks preserved) and displays added lines (green background) and removed lines (red background). It highlights structural changes, paragraph edits, and wording differences. Also shows overall textual similarity percentage.
🔹 Can I compare more than two PDFs?
Currently the tool focuses on side‑by‑side comparison of two documents. For multi‑file comparison, you can sequentially compare pairs. We’re working on advanced batch comparison in future updates.
🔹 Which browsers are supported?
Modern browsers: Chrome, Edge, Firefox, Safari. Ensure JavaScript is enabled. PDF.js requires WebAssembly support, which all modern browsers provide.
PDF Compare Tool · 100% client-side comparison · No tracking
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