Free Document Comparison Tool
Compare PDF and DOCX files to find differences
Major update
Document comparison is now much faster We optimized the diff engine several times, so comparing documents is now dramatically quicker.
Privacy Protection
All file processing is done locally in your browser. No files are uploaded to any server.
Click to upload or drag files here
Supports PDF and DOCX formats
Click to upload or drag files here
Supports PDF and DOCX formats
Why teams use DiffQuery for document review
DiffQuery helps reviewers spot meaningful edits in contracts, reports, policies, and working drafts without uploading files to a remote service.
Because PDF and DOCX processing happens in the browser, the workflow is a better fit for privacy-sensitive review tasks and everyday document checks.
- Compare revision rounds before approval or publication.
- Check vendor, legal, or compliance edits line by line.
- Validate proofreading changes in long documents faster.
How the document comparison flow works
Upload two PDF or DOCX files, start the comparison, and DiffQuery extracts readable text so the page can highlight additions, removals, and unchanged content in one view.
The side-by-side previews help reviewers keep layout context while the diff panel focuses attention on changed text.
Privacy and browser-side processing
DiffQuery is designed for local processing in the browser. Files stay on the current device unless you choose to move them elsewhere yourself.
That approach reduces review friction for internal drafts, procurement documents, and pre-publication materials.
Related guides
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.
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