Compare PDFs

Find every difference between two versions of a document – changed words and changed pictures, page by page.

🔒 Your files are processed on your device and never uploaded.

Compare PDFs at a glance

Price: Free
Account: Not needed
Watermark: None
Privacy: Files are processed inside your browser and are never uploaded.
Works on: Windows, Mac, Linux, Android and iPhone – in any modern browser
Install: Nothing to install

Visual differencesChanges on each page are coloured: red for the old file, green for the new one.

Word-by-word textAdded words in green, removed words crossed out in red.

ReportDownload a PDF report of all changed pages.

How to use Compare PDFs

Choose the old PDF and the new PDF.
Press Compare.
Jump between changes with Next change, switch to the Text tab, or download the report.

When to compare PDFs

Check what changed in a contract, agreement or offer letter before you sign it.
Review a new version of a thesis, report or price list.
Make sure a designer or printer did not change anything by mistake.

Visual and text comparison

The Visual view draws both versions of a page and colours every spot that is different, so you also see changes in logos, signatures, tables and pictures. The Text view reads the words and lists additions and removals in order, which is best for long text documents. Scanned PDFs have no text inside – use the Visual view, or run OCR PDF on both files first.

Tips

If text has simply moved to the next page, the Visual view shows two changed pages while the Text view shows only the real changes. Small differences in anti-aliasing are ignored.

Frequently asked questions

Is Compare PDFs free?

Yes, free and unlimited.

What does the comparison show?

The Visual view colours every spot that differs on each page – red for the old file, green for the new one. The Text view lists words that were added (green) and removed (crossed out in red).

Do the PDFs need the same number of pages?

No. Extra pages are shown as “only in old PDF” or “only in new PDF”.

Can I compare scanned documents?

Yes, with the Visual view. The Text view needs real text, so run scans through OCR PDF first if you want a word list.

Can I save the result?

Yes. Download the report, a PDF with a summary page and a highlighted image of every changed page – handy for sending to a colleague or client.

Are my documents uploaded?

No. Both files are compared inside your browser, which matters for confidential contracts.

Guides for this tool

PDF GuidesHow to Compare Two PDF Files and Find Every Change

Spot what changed between two versions of a contract, report or quote. Learn the difference between visual and text comparison, how to read the results and when to double-check.

9 min read