Compare PDF
Find differences between two PDF documents
Comparison Notes
- Text content differences
- Added text (highlighted in green)
- Removed text (highlighted in red)
- Page-by-page analysis
- Contract revisions
- Document version comparison
- Legal document changes
- Academic paper edits
Compare PDF Files Online — Complete Guide
Find differences between two PDF versions of contracts, specs, and reports. PdfPeaks highlights changes so reviewers can approve revisions faster and avoid missing edits in long documents.
How It Works
Upload the original and revised PDFs, start comparison, and review the diff output. Added, removed, or changed regions appear in the results view depending on document type. Download a comparison report or annotated PDF when available.
- Step 1 — Upload: Select baseline and updated PDF files.
- Step 2 — Compare: Run analysis — large files may take longer.
- Step 3 — Review: Inspect highlighted changes before approval.
Security & Privacy
We treat uploaded files as sensitive data. When you use the PDF compare tool on PdfPeaks, files are transferred over encrypted HTTPS/TLS connections and processed on secure servers in isolated temporary storage. They are used only to perform the operation you requested. Uploaded files and outputs are not permanently stored, are not used to train machine-learning models, and are never sold or shared with third parties for marketing. Temporary files are automatically removed after processing. For full details, see our Privacy Policy and Terms of Service.
Common Use Cases
Professionals, students, and everyday users rely on this tool for tasks such as:
- Legal: Track redlines between contract drafts.
- Engineering: Verify drawing revision marks in PDF exports.
- Compliance: Confirm policy PDFs match approved text.
- Publishing: QC layout changes between proof rounds.
- Software docs: Validate release notes against prior version.
Tips for Best Results
Comparison quality depends on whether PDFs contain real text vs flat scans. Input: two PDF files.