KordFree diff tool
Compare two Word documents
Redline two Word documents in your browser, free, no account: insertions and deletions marked through the document, tracked-changes style, without opening Word. Built by Kord; opens with a sample spec pair loaded.
Free, no account. Opens with a two-revision spec loaded.
Review > Compare exists, and when you have Word open and both files at hand it is the right answer. The cases it does not cover are the ones that generate the email threads: the spec came back from the customer with every tracked change accepted, the vendor sent spec-v2-final.docx with no markup at all, or you are on a machine - or a phone - that does not have Word on it.
Drop the two versions here and read the redline in the browser: insertions and deletions marked through the document, the way a tracked-changes pass would have shown them if anyone had left tracking on. Free, no account, and it opens with a sample spec pair loaded.
What the comparison shows
What you get on screen once both files are in, and why each piece is there:
- A real redline. Inserted and deleted text marked in place through the document - the markup the sender should have left on.
- The document as a document. The comparison renders the pages, not a plain-text dump, so a change in a table or a heading reads as what it is.
- No Word required. The whole thing runs in the browser, which also means it works when the reviewer's machine has LibreOffice, or nothing at all.
- A link for the author. Share the comparison as a URL, so "you changed the acceptance criteria in 6.2" arrives with the evidence.
How to compare two Word documents
Three steps, none of which is signing up:
- Open the diff tool - it loads with a two-revision spec already compared, so you see the result shape before committing your own files.
- Drop your two Word documents into the Before and After slots - up to 25 MB each.
- Read the comparison. If someone else needs to see it, Share turns it into a link.
Every way to compare Word documents
The full set of reasonable answers, including when not to use this one:
| Tool | Reach for it when | Worth knowing |
|---|---|---|
| Word's Review > Compare | Word is open, you have both files, and you want to merge | Needs Word; the result is another document to manage |
| Google Docs version history | The document has lived its whole life in Docs | Useless for the .docx a vendor emailed you |
| Draftable, Diffchecker | Quick online document diffs | Capable generic tools; the free tiers carry limits |
| This one (Kord's diff tool) | A redline of any two .docx revisions, in the browser, free - specs, procedures, contracts | 25 MB per file; conversion happens server-side in memory |
FAQ
The questions people ask before dropping real files on a free tool, answered plainly:
Is it free?
Yes. No account, no trial clock, no watermark. The tool exists because we build Kord, version control for engineering document sets, and a diff you can run in ten seconds explains the product faster than any brochure.
Do my documents get stored?
Files are kept only as long as it takes to draw the comparison. Most formats render in your browser; Word and PowerPoint are converted to a preview by our servers in memory, and a file too big to ride a request travels through a short-lived upload that is deleted automatically. There is no account, so there is no history to attach anything to. The longer answer is at work.withkord.com/security.
The sender accepted all tracked changes. Can I recover what they did?
If you still have the version you sent them, yes - that is the exact case this exists for. Diff your copy against theirs and the redline shows what the accepted changes were.
What is the size limit?
25 MB per file. Larger Office files are routed through a short-lived upload behind the scenes, so a 20 MB workbook behaves the same as a 2 MB one.
Specs change every revision here. Is there a version that tracks them?
Kord, the product this tool comes from: version history on the spec and on everything that quotes it, this same redline between any two revisions, review sessions with sign-off, and an AI pass that flags when a value changed in the spec but not in the datasheet next to it.
When two files aren't the real problem
A one-off diff answers a one-off question. If your team compares Word documents every revision cycle - and the revision that matters sits next to drawings, specs, and calc sheets that have to agree with it - that is the job Kord exists for: version control on the whole document set, this same visual comparison between any two revisions, and review sessions with sign-off before anything is issued. The longer argument is in Git for documents.
Compare other formats
The same tool reads eleven formats - the full list is on the compare index. Nearby: Compare two Excel files · Compare two PDF files · Compare two PowerPoint files.