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Compare two PDFs

See every word that changed between two versions of a document, highlighted on the page, with a list of what was removed and added.

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Document

Page numbers
Header and footer

You can use {page}, {pages}, {date} and {file}.

Watermark
Bookmarks
    Password and info

    Protected with AES-256. Opened a protected PDF? It's saved without its old password unless you set one here.

    Scanned pages (OCR)

    Reads the text in scanned pages so you can search, copy and edit it. It runs on your device; the first run downloads the reader (about 7 MB).

    Compare with another PDF

    Highlights the words that differ from another version of this document.

    Sign in to download

    Downloading needs a free FitMyKB account. Your edits stay right here while you sign in, in a new tab.

    We never store your PDF. It's edited on your device and never uploaded. Your account only holds your name and email.

    Find and replace

    Replaces the PDF's own text, keeping its font where every letter exists in it.

    Spot the changes

    Open the version you have, then choose the other version under Compare. Words that were removed or changed are highlighted in red on your pages, and a summary lists each page's changes, with the old words struck through and the new ones in green.

    Where it helps

    Check a revised rental agreement, offer letter or loan document before signing, compare a filled form with the original, or see what changed between two editions of a notice or syllabus. Small edits like a changed date or amount are easy to miss by reading.

    How it compares

    The text of each page is compared word by word in order, the same way programmers compare code. Layout changes that don't change the words aren't flagged, and scanned pages need OCR first so there's text to compare.

    Use cases

    Checking contract changes

    See what changed between two versions of an agreement before you sign the new one.

    Reviewing edited documents

    Spot the edits someone made to a report or a policy document.

    Question papers and answer keys

    Compare two versions of a paper or key to find differences quickly.

    How it works

    1. Open the first PDF and press Document (the page icon), then Compare with another PDF.

    2. Choose the second PDF.

    3. Read the summary and check the highlighted words on each page.

    Questions

    Does it show formatting changes?

    No, it compares the words. A change in bold or font size isn't flagged.

    Can I compare scanned PDFs?

    Run OCR on both first, then compare.

    What if pages were added?

    Pages that exist in only one version are listed; the comparison continues page by page.

    Are both files kept private?

    Yes. Both are read in your browser and nothing is uploaded.

    Related tools

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