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Document Delta

documentdelta.com

Free plan WebAPI
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Spec score 7.8 #15 of 25 in Document Comparison Software

What it is

Document Delta compares two DOCX files and returns a document marked with Word's native 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, detecting insertions, deletions, and formatting changes at run and character level. It can identify bold, italic, underline, font, and style changes even when the wording is unchanged. Reviewers can accept, reject, or comment on the 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, with examples for C#/.NET, Python, JavaScript, PowerShell, and Java. Files are processed in memory and discarded when comparison finishes. The free demo costs nothing. Each API file is limited to 500 KB, and the public API allows 10 requests per hour per IP address. The free comparison tool is in beta and actively improving.

Spec sheet

Purpose
Document Delta compares two DOCX files and returns one document with differences highlighted using Word's native tracked changes.Read 1 Oct 2026 · documentdelta.com
API
The REST API compares two Word documents with a single HTTP request and requires no SDK or API key.Read 1 Oct 2026 · documentdelta.com
Privacy
Files are processed entirely in memory, never saved, stored, or shared, and are discarded when comparison completes.Read 1 Oct 2026 · documentdelta.com
API file limit
Each original and modified DOCX file sent to the API has a maximum size of 500 KB.Read 1 Oct 2026 · documentdelta.com
API languages
The site provides examples for C#/.NET, Python, JavaScript, PowerShell, and Java, and says the API works from any language.Read 1 Oct 2026 · documentdelta.com
API rate limit
The public API allows 10 requests per hour per IP address.Read 1 Oct 2026 · documentdelta.com
Beta status
The free comparison tool is in beta and actively improving, and the site invites users to report issues or unexpected results.Read 1 Oct 2026 · documentdelta.com
Comparison scope
Its engine analyzes paragraphs, tables, headers, footers, text boxes, content controls, and characters.Read 1 Oct 2026 · documentdelta.com
Formatting
The tool tracks bold, italic, underline, font, and style changes even when text is identical.Read 1 Oct 2026 · documentdelta.com
Performance
The comparison engine is optimized for large documents and says lengthy contracts and legal agreements are compared in seconds.Read 1 Oct 2026 · documentdelta.com
Precision
It detects changes at the run and character level, including insertions, deletions, and formatting changes.Read 1 Oct 2026 · documentdelta.com
Structured content
It compares content controls, text boxes, images, comments, hyperlinks, footnotes, endnotes, and tables.Read 1 Oct 2026 · documentdelta.com
Word revisions
Output uses Word's built-in tracked-changes markup, which can be accepted, rejected, or commented on in Microsoft Word.Read 1 Oct 2026 · documentdelta.com
Workflow
The service uses three steps—upload, compare, and download—and requires no signup.Read 1 Oct 2026 · documentdelta.com

Plans and prices

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

Every Document Delta plan and price →

Strong points and limits

Strong points

  • No signup required for web comparisons.
  • Finds text and formatting changes.
  • Output uses Word tracked changes.
  • Files are discarded after comparison.
  • API needs no SDK or API key.

Limits

  • Compares DOCX files, not PDF.
  • API files are limited to 500 KB each.
  • Public API allows 10 requests per hour per IP.
  • Free 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 suit developers seeking a single-request document comparison without an SDK or API key.

Verdict

Document Delta gives DOCX comparisons as Word revisions, with both a no-signup web workflow and a REST API. Note the API size and rate limits and the beta status before relying on it.

Where Specifiction places it

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