Are the documents uploaded to your servers?

No. This tool runs entirely in the browser. Your PDF files never leave your device, which makes it safe to use with confidential or sensitive documents.

What does synchronised scrolling do exactly?

When synchronised scrolling is on, scrolling in one panel automatically moves the other panel by the same amount, so both documents stay at the same relative position at all times.

Will large PDFs load slowly?

The viewer uses lazy page rendering, so the first pages appear immediately. Subsequent pages load as you scroll, keeping the experience smooth even with large files.

Can I use this on a phone?

Yes, though a phone screen makes side-by-side viewing quite narrow. A tablet or desktop monitor gives the best experience for document comparison.

Is there a file size limit?

Because files are processed locally in the browser, there is no server-imposed size limit. Performance depends on your device's memory and processing power.

Is this tool free to use?

Yes. The PDF Side by Side viewer is completely free with no account or payment required.

PDF Side-by-Side Comparison — Free Online Tool

Split:Sync scroll

📄 LEFTUpload PDF

Upload PDF

📄 RIGHTUpload PDF

Upload PDF

💡 Usage: Contract revision comparison, academic article reference, thesis chapter comparison, invoice/quote analysis. Optimized for tablets (~13"). When sync scroll is on, scrolling one side moves the other proportionally — works even with different page counts/sizes.

Auto-deleted in 7 days

256-bit SSL

Support

Your files are encrypted with SSL and automatically deleted from our servers 7 days after processing.

📖 How to Use

Upload PDF

Drag-drop or click to select your files.

Pick options

Page range / quality / orientation as needed.

Process

Click — server completes the task in seconds.

Download

Get the result; files are deleted in 7 days.