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Revised PDF

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FREE Document Comparison

PDF Compare

Compare two PDFs and instantly see every difference. Text, images, layout — all highlighted with color-coded overlays. All in your browser, zero uploads.

Visual Diff
Side-by-Side
100% Private
Why PDF Compare

16 advanced comparison features

Professional-grade document comparison — right in your browser.

Visual Diff Overlay

See differences highlighted with color-coded overlays — green for additions, red for deletions, yellow for modifications.

Text-Level Comparison

Compare text content word-by-word. Every changed, added, or removed word is highlighted with context.

Side-by-Side View

View both PDFs simultaneously with synchronized scrolling. Differences are aligned for easy visual comparison.

Overlay Mode

Superimpose one PDF over the other with adjustable opacity. Spot visual differences instantly — moved images, shifted text, resized elements.

Change Summary Report

Get a detailed breakdown of all changes — additions, deletions, modifications, moved content, and formatting changes — with page references.

Page-Level Changes

Quickly see which pages have changes and which are identical. Navigate directly to changed pages from the summary.

Ignore Options

Exclude whitespace changes, case differences, or specific text patterns. Focus only on the changes that matter.

Image Comparison

Detect changed, added, or removed images between versions. Visual diff highlights pixel-level differences.

Table Comparison

Compare table data cell-by-cell. Changed values, added rows, and removed columns are all highlighted.

Annotation & Comments

Add comments and annotations to specific differences. Export the annotated comparison for team collaboration.

Multi-Format Export

Export the comparison report as PDF, HTML, or JSON. Share with stakeholders or integrate into your workflow.

Batch Comparison

Compare multiple pairs of PDFs at once. Useful for reviewing changes across a series of documents.

Merge View

Generate a single merged PDF showing both versions with all differences highlighted. Perfect for audit trails.

Change Statistics

See total changes, percentage of content modified, pages affected, and change distribution by type.

Version History

Compare multiple versions of the same document in sequence. Track how a document evolved over time.

100% Client-Side Privacy

Your documents never leave your browser. All comparison happens locally — no uploads, no servers, total confidentiality.

How it works

Compare in 3 simple steps

Upload two PDFs, review differences, export report.

1

Upload two PDFs

Drag & drop the original and revised versions of your PDF. Both files stay in your browser — never uploaded.

2

Compare & review

View differences in side-by-side, overlay, or text diff mode. Navigate to changed pages and review each difference.

3

Export report

Download a detailed change report or merged comparison PDF. Share with your team or keep for audit records.

Your documents never leave your browser

PDF Compare runs 100% client-side using JavaScript and WebAssembly. Unlike cloud-based comparison tools that upload your documents to remote servers, PDFly processes everything on your device. Legal contracts, financial reports, confidential drafts — all stay private.

Zero uploads
Zero tracking
Zero data collected
FAQ

Frequently asked questions

PDF Compare extracts text and visual data from both PDFs using pdf.js, then runs a diff algorithm to identify all changes — text additions, deletions, modifications, image changes, and formatting differences. The results are displayed in your choice of side-by-side, overlay, or text diff view. Everything happens in your browser.
PDF Compare detects text changes (word-level additions, deletions, and modifications), image changes (added, removed, or modified images), table cell changes, formatting differences (fonts, sizes, colors), page-level changes (added or removed pages), and layout shifts (moved elements, resized objects).
Yes, but text comparison requires OCR first. If your PDFs are scanned, the tool will automatically run OCR before comparing text. Visual comparison (overlay mode) works on scanned PDFs without OCR since it compares the rendered pages pixel-by-pixel.
No. PDF Compare runs entirely in your browser using JavaScript and WebAssembly. Both versions of your document — contracts, legal filings, financial reports — are processed on your device and never transmitted anywhere. This is critical for confidential document review.
Yes. The ignore options let you exclude whitespace-only changes, case differences, and custom text patterns using regex. This lets you focus on substantive changes rather than formatting noise. You can also filter by change type (text, images, formatting) in the results view.
Text comparison is highly accurate at the word level — every changed word is identified with surrounding context. Visual comparison detects pixel-level differences between rendered pages. The tool handles complex layouts including multi-column text, tables, and embedded images.
Yes. You can export a detailed change report as PDF, HTML, or JSON. The report includes all changes with page references, change types, and statistics. You can also generate a merged PDF that shows both versions with differences highlighted — perfect for audit trails and stakeholder review.
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