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Compare two PDF files online

PDF compare online free. Compare two PDF files for text differences page by page. Local-first, no sign-in.

What is PDF compare online?

PDF compare online checks two PDF files for differences—usually wording changes in the text layer. People search for “pdf compare online”, “compare two pdf files for differences”, and “pdf comparison online” when reviewing contracts or drafts. This free local-first tool extracts page text and lists line-level changes; it does not do pixel/layout compare or OCR for scans.

PDF comparison features

Spot text differences between two documents.

  • Two-file compare

    Load an original and a revised PDF.

  • Page-by-page text diff

    See changed, added, and removed lines.

  • Local-first

    Everything stays in the browser.

  • Free

    No account required.

How to compare PDFs

Find differences in three steps.

  1. Upload both PDFs

    Add the original and the revised file.

  2. Run compare

    Extract text layers and build the diff.

  3. Review the list

    Scan changed lines by page number.

Tips

Better PDF comparison results.
  • 01

    Use text PDFs

    Exports from Word or Google Docs work best.

  • 02

    Scans need OCR first

    Image-only pages have no text layer to compare.

  • 03

    Keep page counts close

    Large inserts show as long added/removed stretches.

Great for

Jobs that need PDF comparison online.

  • Contract revisions

    Compare two PDF files for wording changes.

  • Policy updates

    See what changed between document versions.

  • Draft reviews

    Check that edits landed where you expect.

Why compare PDFs here

Fast local text diffs.

  • Free

    PDF compare online with no signup.

  • Local-first

    Documents stay on your device.

  • Clear summary

    Counts for same, changed, added, and removed lines.

Technical notes

How comparison works.
Engine
pdf.js text extraction, line-aligned page diffs.
Limits
Up to 20 MB and 50 pages per file.
Privacy
Client-side only—no network upload.

Sources & References

References on PDF text extraction.

Frequently Asked Questions

Quick answers about this tool—open a question to read more.