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Document Delta

Document Delta compares two DOCX files and produces a document with differences marked using Word's built-in tracked changes.

Place
#16 of 25
Score
6.0
Document Delta's website

What Document Delta is

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 nothing. 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.

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 nothing.

Watch out

  • 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.

Who it suits

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.

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.

Plans and prices

From Document Delta's own pricing page, checked 1 Oct 2026.

All about pricing
PlanPriceWhat it gives you
Free demoFreeDOCX files · 500 KB maximum per file · No signup, no cost

The facts

Each one read from Document Delta's own pages, with the date it was checked.

What it does

API
The REST API compares two Word documents with a single HTTP request and requires no SDK or API key.checked 1 Oct 2026
API file limit
Each original and modified DOCX file sent to the API has a maximum size of 500 KB.checked 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.checked 1 Oct 2026
API rate limit
The public API allows 10 requests per hour per IP address.checked 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.checked 1 Oct 2026
Comparison scope
Its engine analyzes paragraphs, tables, headers, footers, text boxes, content controls, and characters.checked 1 Oct 2026
Formatting
The tool tracks bold, italic, underline, font, and style changes even when text is identical.checked 1 Oct 2026
Performance
The comparison engine is optimized for large documents and says lengthy contracts and legal agreements are compared in seconds.checked 1 Oct 2026
Precision
It detects changes at the run and character level, including insertions, deletions, and formatting changes.checked 1 Oct 2026
Privacy
Files are processed entirely in memory, never saved, stored, or shared, and are discarded when comparison completes.checked 1 Oct 2026
Purpose
Document Delta compares two DOCX files and returns one document with differences highlighted using Word's native tracked changes.checked 1 Oct 2026
Structured content
It compares content controls, text boxes, images, comments, hyperlinks, footnotes, endnotes, and tables.checked 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.checked 1 Oct 2026
Workflow
The service uses three steps—upload, compare, and download—and requires no signup.checked 1 Oct 2026

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