How to Compare Two PDF Files and Find Differences (Free)
Compare two versions of a PDF side by side and highlight differences online for free — no account, no server upload. Any device and browser.
When a document goes through multiple revisions, spotting every change manually is error-prone. FixMyPDF's PDF comparison tool highlights differences between two PDF versions — text changes, additions, and deletions — free, in your browser.
How to Compare Two PDFs
Go to fixmypdf.in/tools/compare-pdf. Upload the original PDF as Version A and the revised PDF as Version B. Click "Compare". The tool highlights additions in green, deletions in red, and changed content in yellow — giving you a clear visual diff.
What Gets Compared
Text content is compared at the character level — every word addition, deletion, and change is flagged. Formatting changes (bold to regular, font size changes) are noted where detectable. Image changes are flagged at the page level (image content changed) rather than pixel-level diff.
Legal and Contract Review Use Cases
Comparing contract versions is one of the most critical PDF comparison use cases. Between negotiation rounds, a counterparty may change a clause subtly. Side-by-side comparison catches every text change — even a comma in a warranty clause that changes its legal meaning.
Comparing Academic Paper Revisions
After peer review, compare the submitted version with the revised version to verify all reviewer-requested changes were implemented correctly. Compare the final published version with your submitted version to check if any editorial changes were made without your knowledge.
Privacy for Sensitive Document Comparison
Both PDFs are compared entirely in your browser — neither version is uploaded to any server. For confidential contracts, NDAs, and sensitive business documents, this is essential. The comparison result is also generated locally and never transmitted.
Works on All Devices
Open fixmypdf.in/tools/compare-pdf on Windows, Mac, iPhone, iPad, Android, or Chromebook. The comparison interface is responsive and works on any screen size.
After Comparing
Once you've identified the differences, you can combine the compared documents for a single reference file, or protect the final approved version to prevent further unauthorised changes.
Try Compare PDF Now — Free
Browser-based, private, and instant. No account or software required.
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