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Compare PDF

Find differences between two PDFs.

Compare two PDFs page by page on their text content. Get a clear report of which pages differ and how similar they are. Runs entirely in your browser.

Your files are processed locally in your browser. Nothing is uploaded to a server, ever.

Tip

Drop your file here or click to browse. Everything is processed on this device — nothing is uploaded.

Quick answers

What does this tool do?
Find differences between two PDFs. Compare two PDFs page by page on their text content. Get a clear report of which pages differ and how similar they are.
Is it free?
Yes — free and unlimited, with no account required and no watermark on the result.
What files are supported?
PDF files, up to 100 MB each, up to 2 at once.
Where is my file processed?
Entirely in your browser. Your file never leaves your device — nothing is uploaded to a server.
What are the limitations?
Text-only comparison — visual changes (images, layout, fonts) are not detected.
What happens if processing fails?
You get a clear message explaining what went wrong and how to fix it (try another file, check the format, or start over). Your original file is never touched.

How to Compare PDF

  1. Add the first PDF (original).
  2. Add the second PDF (revised).
  3. Click "Process" — pages are compared on extracted text.
  4. Download the comparison report.

Frequently asked questions

Extracted text per page, with a similarity percentage. Visual layout and images are not compared.

Common problems and fixes

  • Document properties look wrong or stale

    Why: metadata is whatever the creating software wrote — it can be outdated or edited arbitrarily.

    Fix: trust the structural checks (pages, sizes, fonts) as ground truth; clean metadata separately if it matters.

  • The accessibility checker lists many issues

    Why: older PDFs were exported without tagged structure, which screen readers need.

    Fix: re-export from the source app with "tagged PDF" enabled, then re-check.

  • An encrypted file cannot be analysed

    Why: encrypted documents must be unlocked before any tool can parse them.

    Fix: remove protection first if you own the password — tools cannot and should not bypass encryption.

Who uses Compare PDF?

  • Compliance teams — checking PDF/A conformance and tagging before documents go to the archive.
  • Legal review — inspecting metadata before a document is released or filed.
  • PDF producers — QA on generated output — page sizes, fonts embedded, structure intact.

Related tools

PDF Compare ReportA detailed, shareable comparison document.Before / After CompareSee two PDFs side by side.PDF ValidatorVerify a PDF is structurally sound.Side-by-Side CompareView two PDFs page by page, side by side.