Compare PDF Documents Online – Free Side-by-Side Diff Tool

AmorPDF lets you compare PDF documents online free to instantly spot every added, deleted, or modified text between two files without signup or installation. Upload two PDF versions and our comparison tool highlights differences with a clear side-by-side view and redline markup, so you never miss a single change. It’s built for contracts, legal agreements, research papers, and revised reports where accuracy matters.

How to Compare Two PDF Files

Upload the original PDF on the left and the revised PDF on the right, then click Compare to see all differences highlighted in seconds. AmorPDF’s PDF compare tool shows inserted text, deleted content, and formatting edits in distinct colors using both side-by-side and redline comparison modes. The whole process runs in your browser on desktop, tablet, and mobile, so you can review document changes from anywhere without downloading software.

Secure PDF Comparison for Legal & Business Documents

Every file you upload is transferred over an encrypted connection and deleted automatically from our servers after comparison to keep sensitive content private. This makes AmorPDF’s diff checker ideal for comparing contracts, NDAs, tax filings, academic drafts, and policy documents where confidentiality is non-negotiable. Get accurate redline output, spot version differences in seconds, and share results with your team without worrying about data exposure.