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Compare PDF

Beta

Upload two PDF documents and instantly see the differences highlighted. Compare text content, visual layout, or both. Essential for reviewing document revisions and contracts.

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Document A (Original)

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PDF, APPLICATION/PDF

Document B (Modified)

Drop Document B

or click to browse from your device

Select Files

Your files stay on your device — 100% private

PDF, APPLICATION/PDF

How it works

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Drag & drop or click to select. Files stay on your device — nothing is uploaded.

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Frequently Asked Questions

Each page is rendered as an image, then compared pixel-by-pixel. Differences are highlighted in red in the diff view, making changes easy to spot.
Yes — the comparison shows all pages up to the longer document. Extra pages in one document are compared against blank pages.

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What Is PDF Comparison?

PDF comparison analyzes two PDF files side by side and highlights the differences between them. This can include text changes, formatting differences, added or removed content, and visual variations. It's the PDF equivalent of a diff tool for code or track changes in word processors.

Comparing PDFs is critical in legal, design, and business workflows where multiple versions of a document exist. Lawyers compare contract revisions to catch subtle wording changes. Designers compare proof iterations to verify corrections. Quality assurance teams compare document versions to ensure accuracy.

One23PDF's comparison tool processes both files entirely in your browser, highlighting differences visually so you can quickly identify what changed between versions. No files are uploaded, no account is needed, and the comparison is free to use with generous daily limits on file size or page count.

Benefits of Comparing PDFs with One23PDF

Visual Diff

See differences highlighted directly on the document pages. Added, removed, and changed content is color-coded for instant identification.

Text Comparison

Compare the text content of two PDFs word by word. Catch subtle changes in wording, numbers, dates, and other critical details that visual scanning might miss.

Version Tracking

Track changes between document versions efficiently. Know exactly what was modified between drafts without reading both documents in their entirety.

Private Comparison

Both PDF files are compared entirely in your browser. Confidential contracts, legal documents, and proprietary materials never leave your device.

How to Compare PDFs with One23PDF

  1. 1

    Upload Two PDFs

    Drag and drop or browse to select your two PDF files — the original and the revised version. One23PDF loads both documents for side-by-side analysis.

  2. 2

    Run Comparison

    Click compare to analyze both documents. One23PDF identifies text changes, formatting differences, and visual variations between the two files.

  3. 3

    Review Differences

    Browse through the highlighted differences page by page. Changes are color-coded and annotated so you can quickly understand what was modified.

Common Use Cases for PDF Comparison

  • Reviewing contract revisions to identify wording changes
  • Comparing design proofs to verify corrections were made
  • Tracking changes between policy document versions
  • Quality assurance checks on translated or reformatted documents
  • Regulatory compliance reviews of updated documentation

One23PDF vs. Other PDF Comparison Tools

Adobe Acrobat Pro offers PDF comparison as a premium feature in its $19.99/month subscription. Specialized comparison tools like Draftable and DiffPDF require paid licenses or upload documents to their servers.

One23PDF compares PDFs entirely in your browser — no uploads, no subscriptions, and generous daily limits. Both documents remain on your device throughout the comparison, making it safe for confidential contracts, legal documents, and proprietary business materials.

The comparison output clearly highlights additions, deletions, and modifications with intuitive color coding. For legal teams reviewing contract amendments, design teams verifying proof corrections, or compliance teams auditing document updates, One23PDF provides professional comparison capabilities at zero cost.