How does the PDF comparison tool work without uploading files?

LocalDoc utilizes Mozilla's in-browser pdf.js library to parse and extract text streams directly in your computer's temporary memory (RAM). Diff computation and contract risk heuristics execute locally via JavaScript with zero data transmitted over the internet.

Can this tool detect sneaky price increases or altered payment terms in contracts?

Yes. Our automated Financial Impact Scanner specifically scans all modified lines for currency symbols ($, €, £), numerical amounts, percentages, and payment terms (such as Net 30 vs Net 60), generating immediate warning badges above the comparison view.

What high-risk legal clauses are automatically analyzed?

The engine scans for changes across critical contract categories: Limitation of Liability, Termination & Notice Periods, Indemnification & Hold Harmless, Penalties & Liquidated Damages, Governing Law & Jurisdiction, and Confidentiality/Non-Compete clauses.

Does the tool check for missing or added pages between documents?

Yes. The tool counts the exact number of pages in both PDF files and flags any page count discrepancy, warning you if an entire appendix, exhibit, or schedule has been added or removed.

Can I export an audit report of the differences to share with my lawyer or client?

Yes. Click 'Export Audit Report' to download a clean, structured text summary listing all detected additions, deletions, monetary changes, and legal risk alerts.

Is my confidential contract data safe?

Completely safe. Unlike cloud-based diff checkers that store files on third-party servers, LocalDoc guarantees 100% client-side execution. Your contracts, NDAs, and trade secrets never leave your device.

100% Client-Side Contract Risk Diff • Zero Cloud Upload

Compare PDF Files Online Free

Compare two PDF contracts, agreements, or drafts side-by-side. Automatically detect sneaky clause changes, monetary price shifts, altered notice deadlines, and page discrepancies with 100% in-browser RAM privacy.

Document A (Original / Before)

Drop original PDF, DOCX, or text file here

Document B (Modified / After)

Drop revised PDF, DOCX, or text file here

Why Comparing Legal Contracts & PDFs Offline Matters

When reviewing contract amendments, NDAs, lease agreements, or vendor revisions, even a single altered digit or sentence can expose your company or personal finances to significant liability. Sneaky contract modifications often slip through standard redlines—such as changing a payment deadline from 30 days to 10 days, increasing late payment interest from 1% to 5%, or stripping away mutual indemnification clauses.

Most online PDF comparison services force you to upload confidential legal documents to third-party servers, where they may be logged, cached, or exposed to data breaches. LocalDoc processes both files 100% client-side inside your browser memory using Mozilla's pdf.js and local WebAssembly text extraction routines. No document content is ever sent over the network.

The 4 Hidden Contract Revisions to Watch For

💰 1. Monetary Figures & Payment Schedules

Watch for retainer fee increases, subtle percentage changes in royalties or penalties, and shifted payment terms (e.g., from Net 30 to Net 15).

📅 2. Notice Windows & Termination Triggers

Parties often attempt to change termination "for convenience" to "immediate termination for breach" or drastically shorten notice periods.

⚖️ 3. Unilateral Indemnification Shifts

A mutual indemnification clause where both sides protect each other may be covertly converted into a one-sided indemnity where only you absorb legal risks.

📄 4. Added or Missing Appendices

Our page discrepancy detector immediately alerts you if Document B contains extra pages (like an added fee schedule) or missing exhibit pages.

Frequently Asked Questions (FAQ)

Unlike conventional web utilities that send your files to remote cloud servers, LocalDoc runs entirely in your local browser. It utilizes Mozilla's open-source pdf.js engine to read the PDF vector and text data directly into browser RAM. The comparison and risk heuristics execute locally via JavaScript, ensuring zero risk of data interception.

For scanned documents containing image-only pages, first run them through our Image to Text OCR tool to extract selectable text streams, then drop the resulting text into this comparison tool.

The tool uses a high-performance Myers Longest Common Subsequence (LCS) diffing algorithm. It aligns paragraphs and lines between Document A and Document B, then flags additions in green (+ added text) and deletions in red (~~- removed text~~).

Yes. You can drop a .docx file into Document A and a .pdf file into Document B. The tool parses the text from both file formats and computes an accurate side-by-side comparison.

Once you run a comparison, click the 'Export Audit Report' button at the top of the dashboard. This generates a comprehensive plaintext audit log categorizing every financial change, date shift, and altered clause, ready to attach to an email or send to legal counsel.

No. LocalDoc is 100% free with no subscription, no credit card, and no sign-up required. Because processing runs in your device's browser memory, you can compare documents of any standard contract length.

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