Word document comparison — runs entirely on your device
up to 3 pairs per run
Drop the original .docx hereor click to browse
Replace
Drop the modified .docx hereor click to browse
Replace
These are FreeRedline's built-in sample documents — nothing of yours was read or uploaded. Drop your own .docx on either tile to replace them, or download them to try uploading yourself:
engine: docxodus / webassembly processing: local document uploads: 0
FreeRedline compares two Word documents and shows every difference as a tracked change: what was cut, what was added, and what moved from one place to another. That covers the ordinary case: one document before a round of edits, one document after.
Most free document-comparison tools handle one pair of documents per run. FreeRedline lets you add up to three independent comparisons at the same time, each with its own Original and Modified files, its own preview, and its own downloads. Click "Add another comparison" to add a second or third card. That's useful when you're checking three redlines from the same negotiation, or reconciling drafts from three different reviewers in one sitting.
Three is a hard cap, not a soft one. Each comparison runs on a real document-processing engine compiled to WebAssembly, and the app runs them one after another inside your browser instead of on a server, so three is where things stay fast and comfortable on an ordinary laptop. Need to check more than three pairs? Run them in two batches.
It compares .docx files only. There's no PDF input, no Excel or PowerPoint support, no folder or batch upload beyond the three-comparison cap, and no account to create.
No. FreeRedline reads your two files into memory and compares them inside your browser with WebAssembly. Open your browser's developer tools, switch to the Network tab, and run a comparison. You will not see an upload.
No, the comparison itself runs in the browser. You will want Word, or something else that opens .docx files, to view the tracked-changes download afterward.
You can run up to three independent comparisons at once, each with its own Original and Modified pair. Click "Add another comparison" to add a second or third card. FreeRedline does not merge three files into one three-way diff. Each card is a separate two-document comparison, run one after another.
Yes. The .docx you download contains native Word tracked-changes markup for insertions, deletions, and moves, the same kind Word itself produces, so you can accept or reject each change inside Word.
Yes. There is no paid tier, no signup, and no limit beyond the three-comparison cap on a single run.
The Original and Modified files must both be .docx. Older .doc files, PDFs, and password-protected documents are rejected with a message on the affected comparison.
FreeRedline runs the whole comparison in your browser. When you drop in a file, the page reads it directly from disk into memory and never sends it anywhere. There is no server behind the comparison for it to travel to.
Don't take that on faith. Open developer tools (F12, or right-click
and choose Inspect), switch to the Network tab, and run a
comparison. You'll see the page's own scripts and the WebAssembly engine load
once, and nothing else. No request carrying your document goes out. You can
also load the page, turn on airplane mode, and run a comparison anyway:
everything the app needs is already sitting in your browser.
There's no account, no analytics, and no third-party network call anywhere in the app.