Compare PDF
See exactly what changed between two versions of a PDF, line by line.
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1. Original PDF (File A)
or import from
2. Revised PDF (File B)
or import from
Why compare two PDF documents side-by-side?
Reviewing multi-page PDF documents for subtle wording changes, added clauses, or deleted sections is tedious and error-prone when reading documents manually side-by-side:
- Audit Legal Contract Redlines: Detect undisclosed wording changes, modified payment terms, or altered liability clauses returned by counterparties.
- Verify Policy & Terms Updates: Ensure revised employee handbooks, privacy policies, or terms of service contain only intended edits.
- Track Resume & Proposal Iterations: Compare candidate resume revisions or client RFP proposals to spot updated experience details.
- Audit Financial Statements: Detect modified figures across revised earnings reports and balance sheets.
LCS text stream diffing vs pixel visual comparison
Understanding the difference between text diffing and visual comparison:
- Visual Pixel Comparison: Compares image pixels, flagging irrelevant noise like font rendering shifts, margin adjustments, or logo movements.
- Text Stream Diffing (ToolJiffy): Extracts actual text streams across every page and runs a Longest Common Subsequence (LCS) algorithm, isolating genuine word additions and line removals regardless of layout formatting.
Client-side security for sensitive legal contracts & agreements
Uploading unreleased business proposals, merger agreements, financial audits, or employment contracts to third-party cloud comparison servers creates severe data breach risks.
ToolJiffy operates on a zero-cloud architecture. By leveraging WebAssembly and client-side JavaScript (pdfjs-dist), text extraction and diff calculations run 100% locally in your browser memory. Your documents never touch external cloud servers.
Step-by-step guide to comparing your PDFs
- Upload Original PDF (File A): Select or drop your baseline document.
- Upload Revised PDF (File B): Select or drop the updated or redlined document.
- View & Export Diff: ToolJiffy automatically computes the diff, displaying added lines in green (
+) and removed lines in red (−). Click Download Diff Report to save a copy.
Frequently Asked Questions
How do I compare two PDF documents for text differences online for free?
Upload your Original PDF (File A) and your Revised PDF (File B) above. ToolJiffy automatically extracts text streams from both documents, computes a line-by-line diff, highlights added and removed lines, and lets you download a plain text diff report.Are my PDF documents uploaded to any external server during comparison?
No, 100% private. Text stream extraction (pdfjs-dist) and Longest Common Subsequence (LCS) diffing run locally inside your browser memory. Your confidential contracts and policies never leave your computer or phone.Does this tool compare visual layout shifts or text content?
ToolJiffy compares text content streams. It answers the question "what wording, clauses, or numbers were changed, added, or deleted", which is the primary requirement for legal contracts, resumes, and corporate policies.Can I compare scanned PDF documents?
Only if the scanned PDFs contain searchable text layers. For image-only scanned PDFs, run both files through our OCR PDF tool first, then compare the resulting PDFs.Can I export or download the PDF comparison report?
Yes! After comparing, click "📥 Download Diff Report (.txt)" to save a plain text report with + and - markers detailing every change.Why is PDF text diffing important for contract negotiations & legal redlines?
Counterparties often return modified PDF contracts without highlighting sneaky clause changes. PDF Compare reveals every inserted word, deleted line, or modified dollar figure instantly.Can I compare password-protected PDF files?
Encrypted PDFs must be unlocked first using our PDF Unlock tool before comparing.Is ToolJiffy PDF Compare free to use without limits or watermarks?
Yes! ToolJiffy is 100% free with unlimited usage, zero account registrations, and zero watermarks.