PDF Compare
Compare two PDF documents side by side and highlight text additions, deletions, and differences.
86% Match
What is PDF Compare?
PDF Compare is a free online tool designed to compare two PDF files side by side and highlight differences in text content, structure, and page counts. Whether reviewing legal contracts, academic papers, software specifications, or revised draft documents, PDF Compare identifies additions, deletions, and modifications line by line without requiring software installations.
How to Use PDF Compare
- Upload Document A (original PDF) and Document B (revised PDF) into the upload boxes.
- Click Compare PDFs to analyze page counts, metadata, and text content.
- Inspect the highlighted diff view to review added lines (green), removed lines (red), and overall document similarity percentage.
Examples
Compare two document versions
Input: Doc A: Version 1.0 (5 pages) vs Doc B: Version 1.1 (6 pages)
Output: Similarity 88% | 3 Lines Added | 1 Line Removed
Diff legal terms side by side
Input: Doc A: Terms_v1.pdf vs Doc B: Terms_v2.pdf
Output: Shows side-by-side line diff with line numbers and page count summary.
Common Mistakes
- Comparing scanned image PDFs without selectable text layers, resulting in 0 detected text lines.
- Expecting visual pixel diffing on scanned signatures — use text-layer comparison for digital document drafts.
- Forgetting to check page count differences when pages were inserted or deleted from the middle of a document.
Why Use This Tool
- Side-by-side comparison with green/red line diff highlighting.
- 100% private client-side processing with zero server file uploads.
- Page count and metadata summary analysis.