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Document Delta
What it is
Document Delta compares two DOCX files and returns a document with differences marked as Word tracked changes. Its web workflow is upload, compare and download, with no signup required. The comparison covers paragraphs, tables, headers, footers, text boxes, content controls and characters. It identifies insertions, deletions and formatting changes at the run and character level, including style changes when the wording stays the same. Reviewers can accept, reject or comment on the revisions in Microsoft Word. The service also provides a REST API that compares two Word documents in a single HTTP request, without an SDK or API key. Code examples are available for C#/.NET, Python, JavaScript, PowerShell and Java. Files are processed in memory and discarded when comparison ends. The free demo costs nothing. Each API file can be no larger than 500 KB, and the public API allows 10 requests per hour per IP address. The comparison tool is in beta.
For and against
For
- No signup is required for the web workflow.
- Tracks text and formatting changes.
- Word revisions can be accepted or rejected.
- Files are discarded when comparison completes.
- API requires no SDK or API key.
Against
- Compares DOCX files, not PDFs.
- API files are limited to 500 KB each.
- Public API allows 10 requests hourly per IP.
- The comparison tool is in beta.
The verdict
Document Delta provides a no-signup way to compare DOCX files and review differences as Word revisions. Its API has a 500 KB per-file limit and a 10-request hourly limit per IP address.
Who it suits
It suits people who need to review changes between Word documents, including formatting differences, and want revisions they can handle in Microsoft Word. Developers can also use the REST API, subject to its file-size and request limits.
Plans and prices
Free demo
DOCX files · 500 KB maximum per file
Read 1 Oct 2026 · documentdelta.com
On the record
- API
- The REST API compares two Word documents with a single HTTP request and requires no SDK or API key.documentdelta.com · read 1 Oct 2026
- API file limit
- Each original and modified DOCX file sent to the API has a maximum size of 500 KB.documentdelta.com · read 1 Oct 2026
- API languages
- The site provides examples for C#/.NET, Python, JavaScript, PowerShell, and Java, and says the API works from any language.documentdelta.com · read 1 Oct 2026
- API rate limit
- The public API allows 10 requests per hour per IP address.documentdelta.com · read 1 Oct 2026
- Beta status
- The free comparison tool is in beta and actively improving, and the site invites users to report issues or unexpected results.documentdelta.com · read 1 Oct 2026
- Comparison scope
- Its engine analyzes paragraphs, tables, headers, footers, text boxes, content controls, and characters.documentdelta.com · read 1 Oct 2026
- Formatting
- The tool tracks bold, italic, underline, font, and style changes even when text is identical.documentdelta.com · read 1 Oct 2026
- Performance
- The comparison engine is optimized for large documents and says lengthy contracts and legal agreements are compared in seconds.documentdelta.com · read 1 Oct 2026
- Precision
- It detects changes at the run and character level, including insertions, deletions, and formatting changes.documentdelta.com · read 1 Oct 2026
- Privacy
- Files are processed entirely in memory, never saved, stored, or shared, and are discarded when comparison completes.documentdelta.com · read 1 Oct 2026
- Purpose
- Document Delta compares two DOCX files and returns one document with differences highlighted using Word's native tracked changes.documentdelta.com · read 1 Oct 2026
- Structured content
- It compares content controls, text boxes, images, comments, hyperlinks, footnotes, endnotes, and tables.documentdelta.com · read 1 Oct 2026
- Word revisions
- Output uses Word's built-in tracked-changes markup, which can be accepted, rejected, or commented on in Microsoft Word.documentdelta.com · read 1 Oct 2026
- Workflow
- The service uses three steps—upload, compare, and download—and requires no signup.documentdelta.com · read 1 Oct 2026
