Compare PDF Files Online

Identify differences between two versions of a PDF document instantly. Side-by-side comparison for professional accuracy.

Spot the Difference Without the Squinting

Stop playing "Where's Waldo" with your documents. Whether you're comparing contract versions or checking for layout shifts, our AI-powered tool highlights every single change for you. Side-by-side or overlaid, we'll show you exactly what's different so you can get back to things that actually matter.

Why Use iHatePDF's Comparer?

Side-by-Side View

Seamlessly visualize changes with an intuitive side-by-side comparison interface.

Change Highlighting

Every text and image difference is automatically highlighted for quick review.

100% Secure

Your files never leave your browser. All comparison logic runs locally on your device.

Lightning Fast

Identify differences in milliseconds thanks to our advanced processing technology.

Universal Access

Works on any device-mobile, tablet, or desktop-directly in your web browser.

Completely Free

Professional-grade comparison tools with no registration or hidden costs.

How to Compare PDF Files Online

1

Upload Versions

Select the two PDF files you want to compare from your device.

2

Automated Analysis

Click 'Compare Now' to let our tool analyze both documents.

3

Review Changes

Instantly spot text changes, deletes, or additions between versions.

4

Save Results

Download or share the detailed comparison summary easily.

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Frequently Asked Questions

Common questions about comparing PDFs

Our tool uses advanced algorithms to scan two PDF files pixel-by-pixel and text-by-text. It identifies additions, deletions, and modifications, highlighting them in both side-by-side and overlay views for easy identification.
Yes! If your scanned PDFs have searchable text (OCR), our tool can pinpoint changes. For pure image-based scans, the Overlay mode is recommended to visually see differences in layout and content.
Absolutely. iHatePDF processes your files locally in your browser. Your documents are never uploaded to our servers, ensuring 100% privacy and security for your sensitive information.
Text mode focuses on content changes (modified words, new paragraphs), while Overlay mode stacks one PDF on top of another to show visual changes in layout, formatting, and images.
You can compare PDF files up to 50MB each. This limit ensures that the comparison remains fast and responsive within your browser environment.
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