pdftoolz
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Compare PDF

Compare two PDF files and highlight all differences.

How it works

Step 1

Upload your file

Drag & drop or click to select your PDF from your device, Google Drive, or Dropbox.

Step 2

Process

Our servers instantly run Compare PDF on your file — no plugins or software required.

Step 3

Download

Your result is ready in seconds. Click download and you're done.

Frequently asked questions

How do I compare two PDF files for free?
Upload both PDFs — the original on the left, the revised version on the right. Click Compare and the tool highlights all additions, deletions, and changes between the two documents.
What does the PDF comparison highlight?
Added text is highlighted in green, deleted text in red, and changed text is shown with both old and new versions side by side.
Can I compare scanned PDFs?
Text-based PDFs compare perfectly. For scanned PDFs, OCR is needed first — run both documents through OCR PDF, then compare the text-searchable versions.
Why would I need to compare two PDF versions?
Common use cases: reviewing contract revisions, checking that a final approved document matches the signed version, comparing student submissions, proofreading document edits, or verifying translation accuracy.
Does the comparison work page by page?
Yes. The tool compares corresponding pages across both documents. You can navigate page by page to review differences throughout the document.
Can I export the comparison results?
The comparison can be downloaded as an annotated PDF with differences marked, or viewed in-browser for a quick review.