Compare two PDF files and see every difference
Upload two versions of a contract, a report or a drawing and PDFZyro shows what changed: added and deleted words, formatting changes, moved pages and changed pictures, side by side.
Free plan with no time limit. Pro free for 7 days, no card needed.
How to compare two PDF documents
Choose two documents
Pick the older and the newer version from your documents, or upload them. They can be two different files or two versions of the same one.
Let PDFZyro find the changes
The comparison runs in the background, so you can keep working. Long documents are fine: it handles up to 500 pages.
Review and download the report
Step through each difference with the two versions side by side, then download a report that lists every change.
What the comparison finds
Text changes
Words and sentences that were added, deleted or changed, highlighted in both versions so you can read them in context.
Formatting changes
Text that changed font, size or style, which matters in contracts where a clause can be made to look less important.
Pages and pictures
Pages that were added, removed or moved, and pictures that changed, including a visual check of page pairs for drawings and scans.
A report to share
Download a report of every difference to send to a colleague, a client or your lawyer.
Works with versions you already have
Compare any two PDFs, or two versions of a document you edited in PDFZyro, where every save is kept as a version.
Private by design
Encrypted and private
Every file is encrypted before it's stored, and only you and the people you share with can open it.
Your original stays safe
Every change is saved as a new version. The original is never changed, and you can restore it at any time.
No watermarks
Files you save never get a watermark, on any plan, including the free one.
Works in your browser
Nothing to install. Use it on Windows, Mac, Linux, Chromebooks, iPhone, iPad and Android.
Questions and answers
How do I compare two PDF files?
Open Compare in PDFZyro, choose the original and the revised PDF, and start the comparison. When it's done you see the two documents side by side with every difference marked, and a list you can step through.
Can I compare scanned PDFs?
Yes. The visual comparison checks the pages as pictures, so it also finds changes in scans and drawings. To compare the words of a scan, make it searchable first with OCR.
How long are comparisons kept?
Comparison results are kept for 30 days so you can come back to them, and you can delete them sooner. The documents themselves stay in your library until you delete them.
Is comparing PDFs private?
Yes. Your documents are encrypted when stored and only you can open them and their comparisons. Nothing is shared unless you share it.
Is Compare PDF free?
Yes. Compare PDF isn't counted towards the Free plan's daily tasks, so you can use it as much as you like with files up to 50 MB. Pro adds unlimited edit, convert, compress and OCR tasks and more storage, and is free to try for 7 days.
Related tools
Stop reading two versions line by line
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