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Compare PDF

Compare the text of two PDFs and see exactly what changed.

All files are processed in your browser. Nothing is uploaded to any server.

Original

Modified

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Compare PDF Online — Find Text Differences, Free

Compare the text content of two PDF files and instantly see what was added, removed, or changed. Runs entirely in your browser — no upload.

Spotting what changed between two versions of a document by eye is slow and easy to get wrong. This tool reads the text of both PDFs and highlights exactly what was added, removed, or changed, so you can review an update in seconds instead of scanning every line yourself.

Quick answer: Compare PDF

Compare PDF extracts the text from two PDFs and highlights exactly what was added, removed, or changed between them — useful for reviewing contract revisions or document versions without reading both side by side.

Input
Two PDFs with real, selectable text (not scanned images).
Output
A line-by-line diff showing additions and deletions between the two documents.
Know before use
Comparison only works on text pages — scanned or image-only PDFs report "no text could be read" since there's no OCR step; run each through PDF to Text first to check.
Need to pull the text out on its own? Try PDF to Text.
  • ✓100% free, no sign-up required
  • ✓Runs entirely in your browser — no file upload to server
  • ✓Word-level diff with additions and deletions highlighted
  • ✓Works on desktop and mobile
  • ✓Privacy-first: your documents never leave your device

How to Compare Two PDFs

  1. 1
    Upload the first PDF

    Select the original or older version of the document.

  2. 2
    Upload the second PDF

    Select the updated or revised version to compare against it.

  3. 3
    Run the comparison

    The tool reads both files and lines up their text automatically.

  4. 4
    Review the highlighted differences

    Added, removed, and changed text is marked so you can see exactly what changed.

When to Compare PDFs

Review a contract revision

See exactly which clauses changed between drafts before signing.

Check an edited report

Confirm what a collaborator added or removed before approving it.

Verify a reprinted document

Make sure a re-exported PDF matches the original with no accidental changes.

Track policy or document updates

Quickly see what changed in a new version of a recurring document.

Is this tool really free?

Yes, completely free with no hidden charges or file limits.

Where are my files processed?

All processing happens locally in your browser. Nothing is uploaded to any server.

Does this compare layout and images too?

No, this compares text content only. Visual/layout differences aren't detected.

Can I compare password-protected PDFs?

No. Remove the encryption/password from both files first.