catScan

Compare PDF

Show the text differences between two versions.

Processed on your device

  1. 1Choose the files
  2. 2Arrange and adjust
  3. 3Download

You need to sign in to use the tools. It's free.

8 free uses a month · Plus is unlimited

Find what changed between two versions of a document. We compare the text page by page and highlight what was added and what was removed.

How to compare two PDFs in 3 steps

  1. Select the original PDF and the new version.

  2. Start the comparison; you can show only the pages with changes.

  3. Review the differences and download the report if you need it.

Why use catScan

  • Private by design

    This tool works inside your browser: the file is processed on your device and is never uploaded or stored.

  • Free to start

    Sign in with Google and get 8 free uses per period, shared with the catScan app. 1 use = 1 downloaded file; if something fails, it doesn't count.

  • Nothing to install

    It works in any modern browser on computer, tablet or phone. To scan paper with your camera, use the Android app.

Frequently asked questions

Does it compare images or layout?

It compares the text of each page. Changes in images or layout that don't affect the text are not marked.

Can I save the result?

Yes. You can download a text report with all the differences found.

Are my files stored?

No. This tool processes the file on your device, inside the browser: it is not uploaded to any server and nothing is stored.

Is it free?

Yes. Sign in with your Google account and you get 8 uses per period on the free plan (1 use = 1 downloaded file; if something fails, it doesn't count). catScan Plus, bought in the Android app, is unlimited on the web and in the app.

Does it work on my phone?

Yes. It works in any modern browser on Android, iPhone, Windows, Mac or Linux, with nothing to install. The catScan Android app also lets you scan documents with the camera.