Upload two PDFs and see exactly what changed — word by word, page by page.
Original Document
Drag & drop or click to browse
Modified Document
Drag & drop or click to browse
Comparing two versions of the same document by eye is slow, and a changed number hidden deep in a long report is easy to miss entirely. This tool extracts the text from both PDFs, compares them page by page, and flags every difference so you can review exactly what changed. It runs entirely in your browser, so your files never leave your device, and it is available with a Premium subscription. It is built for the people who sign off on documents, not for the file formats themselves.
The results are presented the way a code diff is: added text in green, removed text in red, each labeled with the page it appears on. Identical pages are collected separately so unchanged content does not clutter the report, and if the two files are exactly the same, the tool says so outright instead of returning an empty list.
The tool reads both documents locally, extracts the words from every page, and compares the two texts sentence by sentence. Anything found in one file but not the other is reported as added or removed, which means you can trust the list to reflect real content changes rather than guesses.
Because this is a text comparison, it tracks what the documents say, not how they look. A swapped logo or a subtle shift in layout will not show up in the report, and scanned, image-only PDFs have no text to compare. For documents where the words are what matter — contracts, manuscripts, filings — that focus is exactly what makes the results useful.
Pro tip
Name your files clearly before you compare, for example contract-v3.pdf and contract-v4.pdf. Loading the right pair of documents is the most common source of misleading results, and clear names make it obvious which file is the original and which is the revision.
Legal review is the classic use case: contract versions move back and forth between parties, and every round risks an unapproved clause slipping in. The same logic applies to regulatory filings, manuscript revisions, and any document that gets edited and re-issued. A quick diff between rounds catches changes that a tired reader would walk right past.
The tool is not a substitute for judgment, though. It reports what changed, and you still decide whether each change matters. Pair the diff with a fast visual pass on pages that contain graphics, and you cover both the words and the pictures.
A good habit is to diff every revision the moment it arrives, before anyone reads the new version for content. That way changes are always caught while they are fresh, and nothing slips past simply because the file looked familiar.
Comparing two versions of a confidential document usually means you do not want either copy sitting on a stranger's server. Everything here happens on your own device, so contracts, unpublished drafts, and in-progress filings stay where they belong. The comparison tool is a Premium feature, and the only cost is the processing your browser does on your behalf.
Our PDF Diff tool extracts text from both documents page by page using PDF.js and compares them line by line. Added content is shown in green, removed content in red — just like a code diff. All processing happens in your browser; your files never leave your device.
This is essential for legal document reviews, contract versioning, manuscript edits, and regulatory compliance. Unlike expensive tools like Adobe Acrobat Pro or Draftable, this is included with your Premium subscription.