Compare Two PDF Files Online Free - PDF Diff Checker

Original Drop the old PDF or browse The version you started with

Changed Drop the new PDF or browse The version to check

Ignore case"Total" and "total" count as the same word OFF

Ignore punctuationSkip changed commas, quotes and dashes OFF

Compared on your device - nothing is uploaded.

How to Compare Two PDF Files

Add both versions. Drop the older PDF in Original and the newer PDF in Changed. Mixed them up? Press the swap button.

Compare. Press Compare. Pages are matched by their text, then compared word by word.

Review the changes. Added words are green and removed words are red. Jump between changes, or switch between side-by-side, inline and visual views.

Save a report. Download the differences as an HTML or TXT report, or as a marked-up PDF with both versions side by side.

No files handy? Try two sample versions - a short contract where somebody quietly changed the price, dropped a page and added a new clause.

Text Diff and Visual Diff

The two views catch different kinds of changes.

Text comparison

Reads the words of both versions and lines them up. Best for contracts, reports and papers - you see the exact words that were added or removed, even when the layout moved.

Visual comparison

Draws both pages and compares them pixel by pixel. Best for logos, charts, signatures, stamps and scanned pages - anything that is a picture rather than text.

Comparing scans? Make them searchable first with OCR PDF to get a word-level diff too.

When a PDF Diff Saves the Day

Contracts: check what the other side changed before you sign - a quiet edit to a price or a date is easy to miss.

Reports and theses: see what a reviewer changed between drafts without reading both versions again.

Invoices and statements: spot changed amounts, IBANs or addresses at a glance.

Print proofs: use the visual view to catch moved images, new logos or shifted text before printing.

Sending the result to someone? Hide personal details first with Redact PDF, or browse either file in the PDF File Viewer.

Tips

Too many tiny changes? Switch on Ignore case or Ignore punctuation to focus on real edits.

Noisy visual diff? Lower the sensitivity - smoothing differences between two PDF writers disappear.

Only a few pages matter? Pull them out first with Split PDF.

Need to edit the text? Convert the new version with PDF to Word, or PDF to Markdown for a plain-text copy.

Frequently Asked Questions

Drop the older version in Original and the newer one in Changed, then press Compare. In a few seconds you see every added word in green and every removed word in red, page by page.

Use Next change to jump through the differences, or switch to Visual to see changes in pictures and layout.

The tool matches pages by their text, not just by page number. If a new page 3 was slipped in, it is shown as an added page and the old page 3 is still compared with the new page 4.

The summary at the top counts added, removed and changed pages, plus the words added and removed.

Yes - open the Visual tab. It draws both versions of a page on top of each other and paints every pixel that differs in red. Overlay and swipe modes let you slide between the two, and the sensitivity setting hides tiny rendering noise.

Scans have no real text, so the word comparison has nothing to read. The visual comparison still works on scans. For a word-by-word diff, turn both scans into searchable PDFs first with OCR PDF, then compare those.

Yes. Download an HTML report that opens in any browser, a plain TXT report for email or tickets, or a marked-up PDF that puts each changed page of both versions side by side with the changes highlighted.

No. Both files are opened and compared inside your browser, so contracts and other private documents never leave your device. That also means large files compare quickly - there is no upload to wait for.

Turn the Word file into a PDF first with Word to PDF, then compare the two PDFs here. Going the other way, PDF to Word gives you an editable copy of either version.

PDFs with an open password cannot be read without it. Remove the password with Unlock PDF (you need to know it), then compare the unlocked copy.

Compare PDF