Compare PDFs
Compare two PDF documents side by side to identify differences in text, layout, and content. Perfect for document review, version comparison, and change tracking.
First PDF
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Second PDF
Drop second PDF
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Complete Guide: Compare PDFs
Everything you need to know about using this tool effectively
This PDF comparison tool runs entirely in your browser. Upload two PDF files and it analyzes them side by side, highlighting differences in text content, added or removed pages, and changed formatting. No server upload, no account, no watermarks.
A client-side tool that takes two PDF documents and performs a detailed comparison to identify differences between them. It extracts text from each page of both files, compares the content line by line, and highlights additions, deletions, and modifications. The tool displays both documents in a synchronized side-by-side view where differences are color-coded for easy identification. Page-level differences such as added or removed pages are also flagged. Because all processing happens in your browser, confidential documents like contracts, legal filings, and business reports never leave your device.
Reviewing contract revisions
Compare two versions of a legal contract to identify exactly what changed between drafts, ensuring no unauthorized modifications slipped through during negotiations.
Verifying document edits
Compare an edited document against the original to verify that all requested changes were made correctly and no unintended modifications were introduced.
Auditing compliance documents
Compare regulatory filings or compliance documents across reporting periods to identify what content changed and ensure updates are documented properly.
Tracking report revisions
Compare different versions of a report or proposal to create a change log showing what was added, removed, or modified between iterations.
Upload original PDF
Click the first upload area or drag the original version of your document onto it. This serves as the baseline for comparison.
Upload modified PDF
Click the second upload area or drag the updated version of the document onto it. The tool parses both files and prepares them for comparison.
Review differences
The tool displays a side-by-side view with additions, deletions, and modifications highlighted. Use the navigation controls to jump between changed sections.
For best results, compare PDFs that were generated from the same source format - comparing a scanned PDF with a text-based PDF will show many false differences.
Use the synchronized scrolling feature to keep both documents aligned as you review page-by-page differences.
Check the summary panel first to get an overview of how many pages and sections differ before diving into detailed review.
If the comparison shows too many differences on formatted documents, the changes may be in formatting rather than content - check text-only differences.
What types of differences are detected?
The tool detects text content changes (additions, deletions, and modifications), page-level differences (added or removed pages), and structural changes. It compares the extracted text from each page, so formatting-only changes that do not affect text content may not be flagged.
Can it compare scanned PDFs?
The tool compares text content extracted from PDFs. Scanned PDFs that contain only images will not have extractable text to compare. Run OCR on both scanned documents first, then use this tool to compare the text results.
Is my file uploaded to a server?
No. All comparison processing happens locally in your browser. Both PDF files never leave your device, which is critical for confidential legal and business documents.
Is there a limit on document size?
There is no hard limit, but browser memory constraints mean very large documents with hundreds of pages may slow down. For typical documents up to 100 pages, the comparison runs efficiently.