How to compare two PDFs on Mac
For the contract that came back from the other side with “a few small edits”.
Reading two versions of a forty-page document side by side to find what changed is a task nobody does well. People skim, and the one clause that moved is the one they skim past.
Compare Versions is part of Premium, so it carries a small lock in the document actions panel and in the menu bar. The lock is a label rather than a barrier — you can open the feature and see what it does before deciding to unlock it. Reading and every page operation stay free.
Compare, step by step
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Have both versions to hand
The one you sent and the one that came back, as two files.
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Open Compare Versions
From the document actions panel, under Read & Review, and choose the second document.
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Read the summary first
Which pages changed at all is the most useful thing to know, because it tells you where to look and, more usefully, where not to.
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Step through the differences
Each one is shown in place, with the two versions lined up. Text changes and visual changes are both reported.
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Mark what matters
A note against each change you need to raise turns the comparison into a list you can work from.
What a comparison can and cannot tell you
| Comparison reports | You still have to judge |
|---|---|
| That a clause was changed | Whether the change is acceptable |
| That a paragraph was removed | Whether its removal matters |
| That a number moved | Whether the new number is right |
| That a page looks different | Whether the difference is meaningful or a re-export |
| Where the changes are | What to do about them |
A document re-exported from a different machine can differ everywhere without a single word having changed — different font substitution, slightly different line breaks. That is why the text comparison matters more than the visual one when you are looking for substantive edits.
When one version is a scan
If the copy that came back was printed, signed and scanned, it has no text to compare. Run Make Searchable over it first and you get a text comparison rather than a purely visual one — much more useful, though recognition errors will show up as apparent differences, so read them with that in mind.
Comparing against your own earlier version
You do not always have two files. Snapshots are named restore points kept on your Mac, and Verso takes one automatically before the most destructive operations. Restoring a snapshot to a separate copy gives you the second document to compare against.
Why this runs locally
Comparison means handing over both versions of a document — which, in a negotiation, is the most sensitive pair of files in the matter. Doing it on your own Mac means neither version goes anywhere.
Frequently asked questions
How do I compare two PDFs on a Mac?
Open Compare Versions in Verso, choose the second document, and step through the differences. Both the text and the visual changes are reported.
Can I compare a scanned copy against the original?
Run Make Searchable over the scan first, so there is text to compare. Recognition errors will show up as apparent differences, so read the result with that in mind.
Does comparison tell me whether a change is a problem?
No. It tells you what changed and where. Judging whether a change is acceptable is still yours.
Why does comparison show differences everywhere?
Usually because the document was re-exported from a different machine, so fonts and line breaks differ without any words having changed. The text comparison is the one to trust for substantive edits.
Can I compare against an earlier version of the same file?
Yes, if you have a snapshot. Restore it to a separate copy and compare against that.
Do both documents stay on my Mac?
Yes. Nothing is uploaded.