Compare PDF Files
Upload two PDFs — see text differences and visual changes side by side.
Click or drag & drop
Click or drag & drop
Compare PDF Files Online — Free & Secure
Compare two PDF documents side-by-side to highlight text differences and visual page edits. Spot modifications, additions, and removals with pixel-level precision, processed completely locally in your browser.
How to Compare PDF Documents?
Step-by-step diff guide
Upload Documents
Select or drag & drop two files into the PDF A and PDF B zones. Both files load instantly in your browser.
Click Compare
Click 'Compare PDFs'. The tool reads both files and matches pages pixel-by-pixel and line-by-line.
Review Differences
Examine diff lines. Added lines are highlighted in green, deleted in red, and identical pages in green outline.
Why Compare PDFs Locally?
Fast browser-based operations without queues or subscriptions. Spot contract differences and revisions instantly.
Privacy Guaranteed
No remote file servers. All processing operates in the browser sandbox. 100% confidential.
Double Viewmodes
Toggle between visual page differences (image rendering) or inline text diff lines.
Line-Level LCS Diff
Accurate text analysis lists exact characters added or deleted between versions.
Summary Reports
Instantly see the number of changed pages, lines added, and lines removed.
Frequently Asked Questions
Compare PDF FAQs
How can I compare two PDF files online?
Upload the two PDF documents you want to compare into the 'PDF A' and 'PDF B' zones. Click 'Compare PDFs'. The tool renders each page side-by-side, displaying visual similarities and highlighting added or removed text lines.
Does this tool upload my documents to a server?
No! All text extraction and page comparisons are performed 100% locally in your web browser. No files are uploaded to remote servers, giving you complete privacy and confidence for sensitive data.
Can I compare scanned PDFs?
The tool uses pixel-by-pixel comparisons, so it will highlight visual differences on scanned pages. However, text line differences are generated from embedded document text, which requires selectable text elements (non-scanned or OCR-processed files).
Is there a limit on file size for PDF comparisons?
Since files are analyzed entirely within your web browser, size limits depend mostly on your computer's memory. We optimize memory usage so you can compare large documents smoothly.