How to Compare PDF Revisions Online
Review updated PDF versions, edited pages, and revision changes directly in your browser.
Prepare a reliable PDF revision comparison
Select the earlier PDF as the original and the newer file as the modified version. Confirm the pair before reviewing so that additions and removals are read in the right direction.
DiffQuery compares readable text in the browser. Image-only scans do not contain extractable words; use OCR first when the review depends on text changes.
Use text differences with a visual review
Review changed wording with the surrounding page context, then inspect layout-sensitive areas such as signatures, stamps, tables, and images in the final PDFs.
A text diff can identify changed content, but it does not judge whether a revision is correct or approved.
Document comparison FAQ
Which file types can I compare?
The document comparison page currently supports PDF and DOCX files.
Are my files uploaded to a server?
No. The document workflow is built around local browser-side processing.
What is DiffQuery best used for?
It is most useful for reviewing revisions, proofreading edits, and checking whether document versions contain meaningful textual changes.