Compare PDF

Spot differences in files

Drop PDF here

or click to browse

First document

Maximum recommended file size: 100MB

Files stay private and are processed locally in your browser. Never uploaded to any server.

Drop PDF here

or click to browse

Second document

Maximum recommended file size: 100MB

Files stay private and are processed locally in your browser. Never uploaded to any server.
Overview & Quick Answer

What is Compare PDF?

Compare two PDF documents side-by-side to highlight visual changes and text differences online. Spot revisions instantly with complete privacy.

Manual line-by-line proofreading of long contracts and legal briefs is tedious and error-prone. iLuvePDF's dual-engine comparison utility performs both visual pixel raster diffing and semantic text stream analysis directly in your browser. It highlights altered words, reordered paragraphs, and shifted layout elements with instant side-by-side synchronization.

How to Compare PDFs

Follow these straightforward steps to complete your task in seconds:

1
Upload Original PDF: Drag and drop or select the first PDF file (the original version) in the left upload area.
2
Upload Modified PDF: Drag and drop or select the second PDF file (the modified version) in the right upload area.
3
Start Comparison: Click the "Compare PDFs" button to analyze the documents.
4
Review Differences: Toggle between "Visual" mode to see page-by-page differences and "Text" mode to view a line-by-line breakdown of additions and deletions.

Key Features of Compare PDF

Engineered for speed, precision, and complete data privacy.

Dual Visual & Text Diff Engine

Combines pixel-level raster difference mapping with deep textual sentence comparison.

Color-Coded Revision Highlights

Instantly identifies added text (green), removed text (red), and modified clauses.

Synchronized Page Navigation

Scrolls both document versions in tandem for effortless side-by-side revision auditing.

Confidential Contract Privacy

Audits non-disclosure agreements and private drafts locally on your device without server uploads.

Privacy & Compliance Architecture

Local-first sandbox processing model

100% Client-Side Privacy

Unlike cloud-based tools that transmit your files across the internet to remote servers, iLuvePDF processes all documents directly inside your browser memory using WebAssembly. Your files never leave your device.

GDPR & HIPAA Compatibility

Because zero document data is uploaded, stored, or indexed on external servers, using iLuvePDF automatically meets strict confidentiality and compliance standards for legal, medical, and financial records.

Processing Engine:Client-side Diff Engine & PDF.js
Supported Inputs:PDF (.pdf) - Two Files
Output Format:Visual & Text Comparison Report
File Limits:Unlimited (constrained only by available device memory)

FAQ

Direct answers to common questions about compare pdf.

How do I compare two PDF files?

Upload the original PDF and the modified PDF to our tool. Click "Compare PDFs", and the tool will analyze both documents, providing a side-by-side visual and text comparison to highlight any differences.

Can I see exactly what text was changed?

Yes, our compare tool has a "Text" view mode that displays a line-by-line diff. Added text is highlighted in green, and deleted text is highlighted in red, making it easy to spot revisions.

Is there a page limit for the comparison?

For optimal performance in the browser, our tool currently limits the comparison to the first 10 pages of each document.

In-Depth Guide & Tutorial

How to Compare Two PDF Files & Spot Differences

Learn how to place two document versions side-by-side to instantly highlight visual pixel modifications and text diff comparisons without cloud uploads.

Read Complete Guide