Compare PDF Files Side-by-Side
Compare two PDF files side-by-side free online and highlight every text difference between them.
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Spotting the difference between two versions of a long contract by reading both line by line is slow and error-prone. This tool compares two PDFs directly and highlights exactly where the text differs, so changes are obvious at a glance.
Both documents are shown side-by-side, with additions, deletions and changes marked clearly, so reviewing a revised document takes a fraction of the time a manual read-through would.
How to compare pdf files side-by-side
Upload both PDFs
Choose the original file and the revised version you want to compare.
Review the differences
Changes are highlighted directly on the page, with additions and deletions marked in different colors.
Download the comparison
Save a summary of the differences, or simply review them on screen.
Common ways people use this tool
Legal teams compare a signed contract against an earlier draft to confirm exactly what changed during negotiation. Editors compare two versions of a manuscript to see what an author revised between drafts.
Procurement teams compare a vendor's updated proposal against their original submission to check for price or term changes, and students compare their essay drafts to track their own revisions over time.
A quick tip
For the clearest results, compare two versions of the same document rather than two entirely different files — the tool is built to spot edits within a shared structure, not to summarize unrelated documents.
Related tools
Pair this with another tool to finish the job.
Frequently asked questions
Does this compare text, images, or both?
Text differences are the primary focus; visual layout changes may also be noted depending on how significant they are.
Can I compare more than two files at once?
This tool compares two files at a time; for more versions, run comparisons pairwise between each version.
How are differences shown?
Added, removed and changed text is color-highlighted directly within the document view.
Does file length affect how well comparison works?
Longer documents take slightly more time to process but compare just as accurately as shorter ones.
Can I save the comparison results?
Yes, you can download a version showing the highlighted differences.