Are documents stored on any server?

No. Comparison algorithms execute entirely in your local browser tab.

100% Client-Side Privacy • Zero Server Uploads

Compare Two PDF Files Online (Side-by-Side Diff)

Detect differences, modified clauses, and text revisions between two versions of a contract, report, or document.

Original Document (Version A)

Select the baseline PDF file

Choose Document A

Modified Document (Version B)

Select the revised PDF file to compare

Choose Document B

About Compare PDF with PDFAtlas

Reviewing contract revisions or document drafts line-by-line is time-consuming. PDFAtlas extracts and compares text between Document A and Document B.

Easily navigate changed pages and inspect synchronized side-by-side text panels to spot revisions instantly.

Side-by-Side Comparison

Synchronized visual diff view.

Change Indicators

Instantly identifies pages with modified clauses.

100% Private

Confidential legal contracts remain on your device.

How to Use Compare PDF

Follow three simple steps to complete your document task without installing software or creating an account.

Upload Document A & B

Select the original baseline PDF and the revised PDF version.

Run Comparison

Click "Compare Both Documents" to analyze text changes.

Inspect Differences

Switch between pages and review side-by-side diff panels.

Local Browser Privacy

Files are processed directly inside your browser. No files are uploaded or stored on remote servers.

Blazing Fast Execution

Zero network upload delays. PDF operations execute instantly using high-performance WebAssembly and JavaScript engines.

Works on Any Device

Fully optimized for desktop, tablet, and mobile browsers on Windows, macOS, iOS, and Android.

Frequently Asked Questions

Clear answers to common questions about Compare PDF and PDFAtlas security.

Pages with differences are highlighted with an amber indicator tag in the page switcher.