Mergely review

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Mergely is an open-source JavaScript library and browser-based editor for comparing and merging text and files. It is aimed at developers who need to add side-by-side comparison and interactive two-way merging to web applications. The library supports text and source-file formats including HTML, XML, C, C++, Java, and JavaScript, and provides a JavaScript API for embedding these capabilities. It runs on the web and also supports browser-based diff computation.

For implementation, Mergely includes practical comparison controls: users can ignore whitespace, case, and accented characters, while line numbers, change navigation, and viewport controls help with document review. Files or URLs can be imported in the browser, and saved diffs can be shared through public links. Integration guidance covers React and webpack, with React, Angular, Webpack, and CodeMirror listed among its integrations. Email and community support are available, and the project provides browser-extension deployment support.

Mergely is most suitable when a team wants a focused, open-source two-way diff component rather than a broad file-management or merge suite. Its free open-source model makes it relevant for solo developers through enterprise teams, while the JavaScript API supports embedding the feature into custom products. The main boundary is scope: the documented feature set centers on two-way merging, without syntax highlighting or folder comparison. Teams that need those capabilities, or a three-way merge workflow, should evaluate an alternative. For web applications centered on text comparison and embedded merging, Mergely offers a direct fit with framework guidance and browser-based operation.

Mergely pros and cons

• Where it wins
  • JavaScript API supports embedded comparison and merging
  • Browser-based comparison with interactive two-way merging
  • React and webpack integration guidance plus saved diff links
• Where it doesn't
  • Merge scope is limited to two-way comparisons
  • No documented syntax highlighting
  • No documented folder comparison

Mergely fact sheet, pricing and score →

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Last updated 7 Oct 2026 · How we research and update