Comparing PDF documents side by side is essential for professionals who need to identify differences, verify translations, or review document changes. Unlike traditional methods that require switching between files or using complex desktop software, our browser-based tool places both documents horizontally on the same page, making it easy to spot differences at a glance.
Whether you're comparing contract versions, reviewing translated documents, or analyzing before-and-after changes, our tool provides a simple, secure, and efficient solution. All processing happens directly in your web browser—no file uploads, no server storage, and complete privacy for your sensitive documents.
When to Compare PDFs Side by Side
Side-by-side PDF comparison is ideal for these specific scenarios:
Document Version Comparison
Compare different versions of contracts, legal documents, or manuscripts to identify changes, additions, or deletions between revisions.
Translation Verification
Place original and translated documents side by side to verify translation accuracy, check for omissions, and ensure quality assurance.
Before and After Analysis
Display original and edited versions of reports, proposals, or design documents side by side for easy reference and change tracking.
Legal Document Review
Compare legal documents, contracts, or agreements to identify modifications, review terms, and ensure accuracy across different versions.
How to Compare PDFs Side by Side
Select Your PDFs
Choose two PDF files you want to compare. Drag and drop or click to browse—both methods work seamlessly.
Choose Merge Options
Select how to handle page sizes: scale to fit, stretch to fill, or use larger size. The tool automatically pairs corresponding pages.
Download and Compare
Click merge and download your combined PDF. Each page shows both documents side by side, making comparison effortless.
Privacy for Document Comparison
When comparing PDFs, privacy is crucial—especially for sensitive documents like contracts, legal files, or confidential reports. Our tool processes everything in your browser, so your files never leave your device or get uploaded to any server.
This means you can safely compare confidential documents without worrying about data breaches, unauthorized access, or third-party storage. Learn more about our privacy and security features.
Frequently Asked Questions
Is this PDF comparison tool completely free?
Yes, it's 100% free with no limits, no watermarks, and no hidden fees. You can compare as many PDFs as you want without any restrictions.
Are my PDF files uploaded to any server?
No. All processing happens directly in your browser using JavaScript. Your files never leave your device, ensuring complete privacy for sensitive documents.
Can I compare PDFs with different page sizes?
Yes. The tool offers multiple options: scale pages to fit, stretch to fill, or use the larger page size. It automatically handles PDFs with different dimensions.
Does this tool work offline?
Once the page is loaded, the PDF processing works entirely in your browser. However, you need an internet connection to initially load the page.
What browsers are supported?
The tool works on all modern browsers including Chrome 90+, Firefox 88+, Safari 14+, and Edge 90+. It also works on mobile browsers.