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Mergely

Mergely is a browser-based diff and merge editor, as well as a JavaScript library for comparing and merging text.

Place
#20 of 33
Score
6.1
Mergely's website

What Mergely is

Mergely is a browser-based diff and merge editor, as well as a JavaScript library for comparing and merging text. It displays two documents side by side and marks added, deleted, and changed text. The comparison runs in the browser with JavaScript rather than making server calls for the diff. The maker says imported documents stay in the browser unless saved or shared; saved diffs can be viewed and managed by anyone with the link. Developers can embed the library in a web application and use its API. Options include ignoring whitespace, case, or accented characters, and showing line numbers, wrapping, and sidebars. The API can merge a whole document or a current change from either side. Mergely is free under GPL, LGPL, and MPL open-source licenses. Its documentation recommends the React component and also describes CDN and webpack use, while noting that the Angular component is out of date. Built-in syntax highlighting and three-way merge are not supported.

Good

  • Comparison runs in the browser without server calls
  • Documents appear side by side
  • Can ignore whitespace, case, or accents
  • API supports whole-document or current-change merging
  • Free under GPL, LGPL, and MPL licenses

Watch out

  • No three-way merge
  • No built-in syntax highlighting
  • Angular component is out of date
  • Saved diffs are public to anyone with the link

Who it suits

Mergely suits people comparing or merging two text documents in a browser, and developers embedding diff tools in web applications. It may also suit users who want a free open-source option.

Verdict

Mergely offers browser-based comparison and two-way merging, with options for adjusting how differences appear. Consider its sharing behavior and lack of built-in syntax highlighting before choosing it.

Plans and prices

From Mergely's own pricing page, checked 8 Oct 2026.

All about pricing
PlanPriceWhat it gives you
Open-source licenseFreeGPL · LGPL · MPL
Closed Distribution License (CDL)Priced on requestLifetime license for prior releases and releases in the following year · 1 year of personal email support

The facts

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

Where it runs

Browser processing
Mergely computes differences in the browser using JavaScript, without server calls for the comparison.checked 8 Oct 2026
Supported browsers
The maker lists Firefox, Chrome, Edge, and Safari as supported HTML5 compatible browsers.checked 8 Oct 2026

What it does

Comparison
It shows two documents side by side and highlights added, deleted, and changed text.checked 8 Oct 2026
Diff features
Options include ignoring whitespace, case, or accented characters, line numbers, line wrapping, and sidebars.checked 8 Oct 2026
Embedding
The library can be embedded in a web application and provides an API for integration.checked 8 Oct 2026
File privacy
The maker says imported documents stay in the browser unless the user saves or shares them.checked 8 Oct 2026
Integrations
The documentation recommends the React component and also describes CDN and webpack usage; it says the Angular component is out of date.checked 8 Oct 2026
Language highlighting
Syntax highlighting for different languages is not supported out of the box, but language modes can be added when compiling a custom version.checked 8 Oct 2026
Licensing
Mergely is distributed under GPL, LGPL, and MPL open source licenses, with a CDL available by contacting the maker.checked 8 Oct 2026
Merge controls
The API can merge a whole document or the current change from one side to the other.checked 8 Oct 2026
Purpose
Mergely is a browser based diff and merge editor and JavaScript library for comparing and merging text.checked 8 Oct 2026
Sharing
Saved diffs are public to anyone with the link, who can view and manage the share.checked 8 Oct 2026
Support
The maker directs users to GitHub issues for support, and the CDL includes one year of personal email support.checked 8 Oct 2026

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