Compare PDFs

Compare two PDF documents side by side and identify differences. See what text was added, removed, or changed between document versions.

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100% Private

Instant Processing

Browser-Based

Features

Compare two PDF documents

Highlight added text in green

Highlight removed text in red

Show unchanged text

Calculate similarity percentage

Export diff as HTML or text

Works with multi-page PDFs

Fast text extraction

Files encrypted during transfer, auto-deleted after processing

How It Looks

Document A

Document B

How It Works

Upload the original PDF document

Upload the modified PDF document

Our tool extracts and compares the text

View the differences highlighted by type

Common Use Cases

Comparing contract revisions

Reviewing document changes

Tracking edits in legal documents

Verifying document updates

Auditing policy changes

Comparing report versions

Frequently Asked Questions

What kind of differences can be detected?

The tool detects text that was added, removed, or remains unchanged between the two documents. It compares line by line and highlights the differences.

Does it compare formatting or just text?

Currently, the tool compares text content only. Formatting changes like fonts, colors, or layout are not detected.

Can I compare scanned PDFs?

Scanned PDFs need to have embedded text (OCR) for comparison. If your PDF is image-only, use our OCR tool first to extract the text.

What is the similarity percentage?

The similarity percentage shows how much of the content is unchanged between the two documents. 100% means identical, while lower percentages indicate more differences.

Can I export the comparison results?

Yes, you can export the diff results as HTML for visual review or as plain text for processing in other tools.

Is there a file size limit?

Each PDF can be up to 20MB. For larger documents, consider splitting them first using our Split tool.

Is my file processed securely?

Your files are processed securely by the PDFSub Engine - an isolated server with no internet access. Files are encrypted during transfer and auto-deleted after processing.

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