Document Side-by-Side Viewer - Compare two Word documents side by side - Compare two PDF documents side by side, sync scroll - View and compare PDF and Word docx documents

it365 Toolbox

File 1

Zoom:

{{ doc1.fileName || 'Please import a PDF or Word document' }} ({{ doc1.fileSize }}, {{ doc1.pages.length }} pages)

File 2

Zoom:

{{ doc2.fileName || 'Please import a PDF or Word document' }} ({{ doc2.fileSize }}, {{ doc2.pages.length }} pages)

Select or drag PDF / Word file here

Sync Scroll Alignment

Offset Alignment Mode

Allows keeping the current vertical offset. When one document scrolls a certain number of pixels, the other moves by the same distance. This is highly flexible for comparing two PDF/Word files with different chapter lengths, layouts, or page counts.

Absolute Alignment Mode

Enforces proportional position locking between both windows. When the left scrolls to any percentage, the right instantly aligns to the exact same percentage height. Ideal for contract audits and precision version comparisons.

🚀 Quick Start

🎈 Step 1: Import documents to compare

Click the upload area on the left and right, or click the "Import File" button at the top, or drag and drop local PDF or Word (.docx) files directly into the corresponding compare windows.

🎈 Step 2: Mixed format support & synchronized scrolling

Supports PDF vs PDF, Word vs Word, and **Word vs PDF mixed format** side-by-side comparison. Scrolling on either side automatically triggers scrolling on the other, with both offset and absolute alignment available.

🔍 Key Comparison Steps & Tips

To help you quickly identify differences between two files, this tool allows you to view two documents side by side on a single screen with synchronized scrolling. This is highly useful for contract audits, academic paper revisions, and translation proofreading.

🛡️ Privacy & Security: All processing and rendering are done locally in your browser. Your files will never be uploaded to any server, ensuring total confidentiality. Works on Windows, Mac, and mobile platforms.

💡 Offset and Absolute Alignment Modes Explained

• 🔗 Offset Alignment Mode (Recommended / Offset Comparison): This mode allows you to keep any vertical offset before scrolling. Useful when chapter layouts or page counts differ. Once adjusted manually, the system logs the scrolling difference (Delta) and scrolls accordingly.

• 🎯 Absolute Alignment Mode: The right side instantly aligns to the exact same percentage height as the left. Perfect for comparing highly similar versions or contracts.

🔘 Swap Position: Click "Swap Position" at the top to visually swap the left and right document areas. File names, controls, and clear buttons remain in place for easy reading.

🌟 Features & Advantages

• 🔒 100% Privacy Protection: Runs entirely client-side. Files are only read and rendered locally in your browser and never uploaded, securing sensitive contracts or personal archives.

• 📱 Fully Responsive Layout: Defaults to a dual-pane layout on desktops, and automatically adapts to a stacked vertical layout on mobile devices (phones/tablets). Sync scrolling and zoom remain fully functional.

• 📂 Word Online Editing Support: Not only can you compare Word (.docx) files, but you can also edit them directly in the browser and instantly download the updated file.

🎯 Common Use Cases for Side-by-Side Synchronized Scrolling

Compare PDF and Word documents side by side with seamless scrolling synchronization to double your reading, proofreading, and audit efficiency.

View and Compare Word and PDF Side by Side

Designed for cross-format proofreading. Load the revised Word (.docx) file on the left and the exported PDF on the right. The system seamlessly handles synchronized scrolling to help you quickly spot conversion issues.

Contract Version Auditing & Revision Verification

Compare commercial contracts or bidding documents word-by-word. Place the draft on the left and the revision on the right. With Absolute Alignment Mode, scroll proportionally to verify all edits, additions, and deletions.

Multilingual Translation & Academic Reading

Open original foreign PDFs/Word documents alongside translated versions. Synchronized scrolling helps you read and proofread bilingual documents without switching tabs.

💡 Want to know more about Word Side-by-Side Viewing?

Learn how to open two Word docx documents side-by-side, edit online, and export back to docx with our comprehensive guide.

View Word Side-by-Side Sync Scroll Guide

💡 Want to know more about PDF Side-by-Side Viewing?

Get detailed guides, sync scrolling tips, and FAQs on opening two PDF documents side-by-side.

View PDF Side-by-Side Sync Scroll Guide

💎 Key Features & Advantages

Mixed PDF & Word Comparison

Break format barriers. Compare PDF vs PDF, Word vs Word, or Word vs PDF. Place a PDF on one side and a Word file on the other, or open identical formats on both sides.

Offset Alignment, Layout Tolerant

Keep a custom vertical offset. Scrolling one pane moves the other by the same offset. Highly suited for documents with varying page layouts or section lengths.

Absolute Alignment, Lock Scroll

Lock scroll positions proportionally. No matter where you scroll, both panes align at the same vertical percentage, ideal for precise contract reviews.

Word Online Editing & Export

Editing is fully supported for Word (.docx) files. Click anywhere to edit, format, or fix mistakes, and download the finished docx file with one click.

100% Client-Side Privacy

All document parsing, rendering, and comparisons happen in browser memory. Nothing is sent to servers, securing sensitive corporate files.

One-Click Swap Windows

Easily swap the left and right window views with a single click if you uploaded them in the wrong order.