Free PDF Tool · Compare

Compare PDF

Run compare pdf in your browser. Free, private, no signup — your selected files are processed in your browser and are not uploaded to our server.

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Drop your files here

or click to browse from your device

Accepts: .PDF
Note: Text mode compares extracted page text and shows a short word-level difference preview. Visual mode renders pages to canvas and reports pixel differences; print/rendering differences and complex layout changes should still be reviewed manually.

About this Compare PDF

Compare two PDFs with our compare pdf tool — by extracted text, rendered-page pixel differences, or both. Text mode compares extracted page text; visual mode renders pages and reports pixel differences.

The result is a browser-side comparison report with text difference previews, visual pixel-diff percentages, and page summaries. Useful for tracking edits in contracts, reports, and other text-heavy documents.

Your privacy is the default. Your selected files are processed in your browser and are not uploaded to our server; all processing happens client-side using PDF.js and browser canvas APIs. Closing the tab clears the working session from this page; downloaded files remain on your device.

This tool is free to use with no signup required. Large files may be limited by your browser’s memory and device performance. Part of PDF Tools Base, a privacy-first collection of 161 PDF utilities. Bookmark the page for next time, and explore related tools in the footer below.

How to use the Compare PDF tool

  1. Drop two PDF files.
  2. Click Process. Depending on the comparison mode, extracted page text is compared and/or pages are rendered for visual pixel comparison.
  3. Download the diff report.

Why use PDF Tools Base?

100% Browser-Based

Compare PDF processes selected files in your browser. Your selected files are processed in your browser and are not uploaded to our server.

No Server Upload, No Signup

Your selected files are processed locally in your browser. No account, no server upload, no email needed.

No Watermark Ever

Outputs are clean. We never stamp our brand or a paywall watermark on your files.

Free to Use

No accounts and no signup. Use the tool as much as you need within reasonable browser limits.

Works on Every Device

Windows, Mac, Linux, iPhone, iPad, Android, Chromebook. Any modern browser.

Built on Open Source

Powered by PDF.js and browser canvas APIs for page rendering and comparison.

Common uses for compare pdf

Contract revisions

Spot which clauses changed.

Document review

Track edits in proposals.

Audit trails

Compare reported vs filed numbers.

Version control

Diff successive drafts.

Frequently asked questions

Is Compare PDF safe to use?

Yes. Everything happens in your browser. Your selected files are processed in your browser and are not uploaded to our server. Closing the tab clears the working session from this page; downloaded outputs remain on your device until you delete them.

Do I need to register or sign in?

No. No account, no email, no sign-up. Open the page and start using the tool immediately. Free to use, no signup needed.

Is there a watermark on the output?

No. PDF Tools Base never adds a watermark or branding to your output. Your final file is clean — just what you produced from the original.

Is there a file size limit?

Phones may struggle with PDFs over 50–100MB; desktops may handle larger PDFs but can still fail on very large or complex files. Large PDFs may be slow or fail depending on browser memory, page count, render mode, and PDF complexity.

Does this work on mobile devices?

Yes. The tool works on all modern mobile browsers: Chrome on Android, Safari on iOS, Firefox, Edge, Brave. The drag-and-drop also accepts files from your phone’s file manager.

Will compare pdf detect formatting changes?

Text mode does not detect formatting-only changes. Visual mode can show raster/pixel differences for rendered pages, but complex layout differences should still be reviewed manually.