Compare PDF

Upload two PDFs to visually compare pages side by side and highlight differences.

Original PDF
Click or drop
Modified PDF
Click or drop

About Compare PDF

Compare PDF renders matching pages from an original and modified document, then highlights differing pixels so you can review revisions without uploading either file.

How to Use Compare PDF Online

  1. Open Compare PDF and choose the Original PDF file.
  2. Choose the Modified PDF file and wait for both previews to load.
  3. Select Compare Pages, then move through pages with the arrows.
  4. Review the highlighted differences and page counts before acting on the result.

100% Client-Side Privacy

Files process in local browser memory via WebAssembly. Your documents are never uploaded to remote servers.

Supported Input

Two PDF files

Output Result

A side-by-side comparison view

Practical Pro-Tip

Use matching versions with similar page sizes for the clearest comparison.

Need Visual Step-by-Step Guidance?

Explore our complete walkthrough for Compare PDF with full interface screenshots, option reference, and troubleshooting FAQs.

Read Compare PDF Guide

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Created by @officialhazim42 · Free forever · No sign-up · No uploads to server