How does the PDF Document Similarity Checker work?

The checker loads both PDF documents in your browser and extracts their plain text content using local WebAssembly tools. It then runs statistical similarity indices comparing word bags and counts to compute a similarity score and highlights the differing sections side-by-side.

Are my confidential files uploaded or saved?

No. Everything runs 100% client-side in your local browser sandbox. Your files, text, and comparison results are processed locally in-memory and are never uploaded to any server or shared with external APIs, ensuring complete data privacy.

What does the similarity score represent?

The score (0-100%) represents the degree of overlap between the two documents. Higher scores indicate significant content duplication or version alignment, whereas lower scores mean the documents are mostly unique.

How does the PDF Document Similarity Checker work?

The checker loads both PDF documents in your browser and extracts their plain text content using local WebAssembly tools. It then runs statistical similarity indices comparing word bags and counts to compute a similarity score and highlights the differing sections side-by-side.

Are my confidential files uploaded or saved?

No. Everything runs 100% client-side in your local browser sandbox. Your files, text, and comparison results are processed locally in-memory and are never uploaded to any server or shared with external APIs, ensuring complete data privacy.

What does the similarity score represent?

The score (0-100%) represents the degree of overlap between the two documents. Higher scores indicate significant content duplication or version alignment, whereas lower scores mean the documents are mostly unique.

Files never leave your device. Processing happens locally in your browser.

Browser Native

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Document Similarity Checker

Compare two PDF documents to instantly identify similarity scores, matching content percentage, and highlighted differences.

Document A (Reference PDF)

Upload Document A

Supported format(s): .pdf, .PDF up to 100MB

Document B (Comparison PDF)

Upload Document B

Supported format(s): .pdf, .PDF up to 100MB

100% Client-Side

Your document stays in-memory. Zero server uploads. Unlike cloud-based PDF tools, all conversion, compression, and visual editing happens directly within your web browser. No document files are uploaded to any server. This guarantees that your sensitive information remains completely private.

How to use this tool

1
Select and upload the first PDF document (Document A).
2
Select and upload the second PDF document (Document B).
3
Click the 'Compare Documents' button to process the texts client-side.
4
Review your similarity percentage score, matching content summaries, and check differences highlighted in the split comparison panes.

Document Similarity Checker

Upload Document A

Upload Document B

100% Client-Side

How to use this tool

Frequently Asked Questions