Compare two PDFs and see every change
When a contract or report comes back “with a few small edits”, reading both versions line by line is slow and risky. AllofPDF compares two PDFs on your computer and highlights what was added, removed and changed, with a similarity score and a summary of the differences. It is free and your documents never leave your PC.
Also available for Windows ARM64Also available for Windows x64Portable ZIP (no install)
AllofPDF runs on Windows 10 and 11. Open this page on your PC to download.
How to compare PDFs
- Open the two versions you want to compare.
- Choose Compare and select which file is the original and which is the revised version.
- Review the side-by-side view: additions, deletions and changes are color-coded, with a count of each.
- Jump from change to change, and ask the AI to summarize the differences with page citations if you like.
Why compare with AllofPDF
Every change highlighted
Added, removed and changed passages are marked in different colors, so a single altered number or date stands out.
Instant overview
A similarity score and counts of additions, deletions and changes tell you at a glance how much a document moved.
Made for confidential drafts
Contracts, bids and policy drafts are compared locally instead of being uploaded to an online diff tool.
Comparing scans and exported files
Comparison works on the text of both documents. If one version is a scan, run OCR on it first so there is text to compare. Documents exported from different programs can have different line breaks and page layouts; the comparison focuses on the words, so reflowed paragraphs do not appear as changes unless their content changed.
Frequently asked questions
Is PDF comparison free?
Yes. Comparing documents is free, with no page limit and no upload.
Can I compare a scanned PDF with a digital one?
Yes. Run OCR on the scanned version first so both documents contain text, then compare them.
Does it compare images and formatting?
The comparison focuses on text content, which is where contract and report changes matter most. Visual differences in images are not highlighted.
Get AllofPDF, it's free
Windows 10 & 11 · x64 & ARM64 · Installer or portable ZIP