Free Toolkit

PDF CompareCompare two PDF files side by side for differences.

PDF Compare illustration
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PDF Compare

Compare two PDF files side by side for differences.

How to Use
1

Upload PDFs

Drop two PDF files to compare.

2

View Comparison

See differences in metadata, pages, and properties.

3

Analyze

Review matches and mismatches in a table.

What Is PDF Compare?

The PDF Compare tool analyzes two PDF files and presents a detailed side-by-side comparison. Compare file names, sizes, page counts, page dimensions, and document metadata including title, author, creator, and producer. Each property shows whether the two PDFs match or differ, making it easy to spot discrepancies. Useful for verifying PDF conversions, checking document versions, or validating processing results. Instant analysis with no file upload to external servers.

Why Use Our PDF Compare?

  • Detailed property-by-property comparison
  • Visual match/mismatch indicators
  • Compares metadata, dimensions, and structure
  • Instant results with no server processing

Common Use Cases

Version Control

Verify that document versions have expected differences.

Conversion Validation

Check that converted PDFs match originals.

Quality Assurance

Compare output files against reference documents.

Audit

Document differences between file versions for compliance.

Technical Guide

Uses pdf-lib to load both PDFs and extract document properties. Compares file metadata (title, author, creator, producer), structural properties (page count, first page dimensions), and file-level attributes (name, size). Results are presented in a comparison table with match/mismatch indicators for each property. All analysis is performed client-side.

Tips & Best Practices

  • 1
    Upload the reference PDF as PDF A
  • 2
    Check page dimensions for conversion accuracy
  • 3
    File size differences may indicate compression changes
  • 4
    Metadata differences can reveal processing history

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Frequently Asked Questions

QDoes this compare actual content?
Currently compares file properties and metadata. Visual content comparison is not yet supported.
QCan I compare more than two PDFs?
Compare two at a time. Run multiple comparisons for more files.
QDoes file order matter?
No, both files are analyzed the same way. The table shows them as PDF A and PDF B.
QWhat properties are compared?
File name, size, page count, page dimensions, title, author, creator, and producer.
QIs this tool free?
Yes, completely free with no limits.

About PDF Compare

PDF Compare is a free online tool from FreeToolkit.ai. All processing happens directly in your browser — your data never leaves your device. No registration required. No ads. Just fast, reliable tools.