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Crowdsourced Redlines
What it is
Crowdsourced Redlines compares two Microsoft Word .docx files and creates a third document with insertions, deletions, and moves marked as native Word tracked changes. Reviewers can accept or reject changes individually in Word. The browser app performs comparisons locally using WebAssembly in a Web Worker and downloads the result to the device; the default browser workflow does not upload files to a server. An optional server-side API processes documents in memory and stores nothing. The comparison engine also detects formatting changes and handles tables. It is described as a .NET 8 WebAssembly modernization of Microsoft's archived Open-Xml-PowerTools comparison engine. The engine, document viewer, Python wrapper, and web app are MIT-licensed and publicly developed on GitHub. Users can self-host, audit, or embed the codebase, and developers can use packages for TypeScript or JavaScript, Python, and C#/.NET. Users can file public tickets with source files when a comparison is poor; those tickets become regression-test fixtures. The tool is free, with web, API, and self-hosting options.
For and against
For
- Browser comparisons run locally without uploading files.
- Changes are returned as native Word tracked changes.
- Reviewers can accept or reject changes individually.
- Developer packages are available for three language ecosystems.
Against
- The described web tool compares Microsoft Word .docx files.
- Optional API processing is server-side, though in memory.
The verdict
Crowdsourced Redlines provides a free DOCX comparison workflow with local browser processing and native tracked changes. Its stated document scope is Microsoft Word .docx files.
Who it suits
Crowdsourced Redlines suits people who need to compare Word .docx files and review individual changes in Word. Developers can also use its packages or self-host the open-source codebase.
Plans and prices
Free
Free, open-source DOCX comparison tool
Read 7 Oct 2026 · redlines.opensource.legal
On the record
- API privacy
- The optional server-side API processes documents in memory and stores nothing.redlines.opensource.legal · read 7 Oct 2026
- Browser processing
- The browser app runs its comparison locally via WebAssembly in a Web Worker, and the result downloads directly to the device.redlines.opensource.legal · read 7 Oct 2026
- Comparison engine
- Docxodus is described as a .NET 8 WebAssembly modernization of Microsoft's archived Open-Xml-PowerTools comparison engine.redlines.opensource.legal · read 7 Oct 2026
- Comparison features
- The comparison engine adds move detection, format-change detection, and improved table handling.redlines.opensource.legal · read 7 Oct 2026
- Crowdsourced feedback
- Users can file a public ticket with source files when a comparison produces a bad redline; the ticket becomes a regression-test fixture.redlines.opensource.legal · read 7 Oct 2026
- Developer packages
- The engine is available for TypeScript or JavaScript, Python, and C#/.NET.redlines.opensource.legal · read 7 Oct 2026
- File privacy
- The default browser comparison does not upload files to a server.redlines.opensource.legal · read 7 Oct 2026
- License
- The site says the comparison engine, document viewer, Python wrapper, and web app are MIT-licensed and publicly developed on GitHub.redlines.opensource.legal · read 7 Oct 2026
- Output
- Reviewers can accept or reject each tracked change individually in Word.redlines.opensource.legal · read 7 Oct 2026
- Purpose
- Crowdsourced Redlines compares two Microsoft Word .docx files and produces a third document with insertions, deletions, and moves as native Word tracked changes.redlines.opensource.legal · read 7 Oct 2026
- Self-hosting
- The site says users can self-host, audit, or embed the open-source codebase.redlines.opensource.legal · read 7 Oct 2026
- Supported documents
- The described web tool compares Microsoft Word .docx files.redlines.opensource.legal · read 7 Oct 2026
