Compare PDF Files Online – Find Differences Between Two PDFs

Spot every difference between two versions of a document. Compare text side by side with changes highlighted, or overlay pages to see visual changes.

Your files are compared in your browser and never uploaded.

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Free online PDF comparison

See exactly what changed between versions

Did the other side change the contract? Which numbers moved in the new report? iHeartPDF Compare PDF shows you every difference in seconds.

Text mode lines both documents up side by side and highlights added, removed and changed words, with page numbers. Visual mode overlays the pages and marks every changed pixel in red — ideal for layouts, drawings and scans.

100% freeNo uploadNo watermarkWorks on any device

How to compare two PDFs in 3 easy steps

1

Add both files

Drop the original PDF on the left and the modified version on the right.

2

Choose a mode

Pick Text to compare wording, or Visual to compare how the pages look.

3

Review the changes

Jump from change to change, show only differences, or flip through pages in visual mode.

Why compare PDFs with iHeartPDF?

🔎

Word-level highlights

Changed words are marked in red and green inside each line, not just whole paragraphs.

🖼️

Visual overlay

Catch changes in images, layout, stamps and scanned pages.

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Jump between changes

Counters and next/previous buttons take you straight to each difference.

🔒

100% private

Everything happens right in your browser — your file never leaves your device.

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Free with no watermark

No account, no trial limits and no watermark added to your files. Use it as often as you like.

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Works on any device

Use it on Windows, Mac, Linux, iPhone or Android — in any modern browser, with nothing to install.

Perfect for

  • Checking contract revisions before signing
  • Reviewing edits to reports, policies and manuals
  • Verifying that a “final” version matches what was approved
  • Comparing drawings and design proofs
  • Proofreading translated or updated documents

Pro tips

  1. Scanned documents have no text layer — use Visual mode, or run OCR PDF first.
  2. Tick Show changes only to skim long documents quickly.
  3. Keep the older version on the left so additions show up in green.

Frequently asked questions

Add the original and modified PDFs, choose Text or Visual mode and click Compare PDF.

No. The comparison runs entirely in your browser.

Yes, in Visual mode, which compares the page images pixel by pixel.

Yes. Every changed line shows its page number in each document.

No. Processing happens entirely inside your browser, so your file never leaves your device. That makes it fast and completely private.

Absolutely. iHeartPDF works in any modern browser on iPhone, Android, tablets, Windows, Mac and Linux — no app or software installation needed.

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