Document Delta

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Score6.9

Rank#6 of 25

PriceFree

Free planYes

Runs onAPI, Web

Summary

Document Delta compares two DOCX files and produces a document with differences marked using Word's built-in tracked changes. Its web workflow is upload, compare and download, with no signup required. The comparison examines paragraphs, tables, headers, footers, text boxes, content controls and characters, identifying insertions, deletions and formatting changes at run and character level. It can flag bold, italic, underline, font and style changes even when the wording stays the same. Reviewers can accept, reject or comment on the resulting revisions in Microsoft Word. The service also offers a REST API that compares two Word documents in one HTTP request without an SDK or API key; examples are provided for C#/.NET, Python, JavaScript, PowerShell and Java. Files are processed in memory and discarded when comparison completes. The free demo costs 0.00 USD per free. API files are limited to 500 KB each, and the public API allows 10 requests per hour per IP address. The comparison tool is in beta and actively improving.

Who it is for

Document Delta suits people who need to compare DOCX files and review changes in Microsoft Word. Its API may also suit developers who want to submit document comparisons with an HTTP request.

What is good

No signup required for web comparisons.
Tracks text and formatting changes.
Output uses Word tracked-changes markup.
Files are discarded after comparison.
Free demo costs 0.00 USD per free.

What to know first

Only DOCX comparison is listed.
API files are limited to 500 KB each.
Public API allows 10 requests per hour per IP.
Comparison tool is in beta.

Verdict

Document Delta focuses on DOCX comparison with Word-compatible revision markup and a no-signup workflow. Note the API limits and beta status if relying on it for regular comparisons.

Document Delta plans and pricing

All plans

Free demo Free No signup, no cost DOCX files · 500 KB maximum per file documentdelta.com · 1 Oct 2026

Compared on document comparison software

Free plan: Yesdocumentdelta.com
PDF comparison: Nodocumentdelta.com
Office file comparison: Yesdocumentdelta.com
Formatting changes: Yesdocumentdelta.com
Redline output: Yesdocumentdelta.com
Deployment: webdocumentdelta.com

Facts

Purpose: Document Delta compares two DOCX files and returns one document with differences highlighted using Word's native tracked changes.documentdelta.com · 1 Oct 2026
Workflow: The service uses three steps—upload, compare, and download—and requires no signup.documentdelta.com · 1 Oct 2026
Comparison scope: Its engine analyzes paragraphs, tables, headers, footers, text boxes, content controls, and characters.documentdelta.com · 1 Oct 2026
Precision: It detects changes at the run and character level, including insertions, deletions, and formatting changes.documentdelta.com · 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 · 1 Oct 2026
Formatting: The tool tracks bold, italic, underline, font, and style changes even when text is identical.documentdelta.com · 1 Oct 2026
Structured content: It compares content controls, text boxes, images, comments, hyperlinks, footnotes, endnotes, and tables.documentdelta.com · 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 · 1 Oct 2026
Privacy: Files are processed entirely in memory, never saved, stored, or shared, and are discarded when comparison completes.documentdelta.com · 1 Oct 2026
API: The REST API compares two Word documents with a single HTTP request and requires no SDK or API key.documentdelta.com · 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 · 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 · 1 Oct 2026
API rate limit: The public API allows 10 requests per hour per IP address.documentdelta.com · 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 · 1 Oct 2026