- Home
- File Comparison Software
- Mergely
Mergely
What it is
Mergely is a browser-based diff and merge editor, as well as a JavaScript library for comparing and merging two text documents. It places documents side by side and marks added, deleted, and changed text. The comparison runs in the browser with JavaScript, without server calls for the diff. The maker says imported documents stay in the browser unless saved or shared; saved diffs are public to anyone with the link, who can view and manage the share. The open-source version is free under GPL, LGPL, and MPL licenses. Developers can embed its library in a web application and use its API. Documentation recommends a React component and also describes CDN and webpack usage; the Angular component is out of date. Options include ignoring whitespace, case, or accented characters, as well as line numbers, wrapping, and sidebars. The API can merge a whole document or a current change from one side to the other. Firefox, Chrome, Edge, and Safari are listed as supported browsers. Three-way merge and built-in syntax highlighting are not supported; custom versions can add language modes when compiled.
For and against
For
- Diff comparison runs in the browser
- Imported documents stay local unless saved or shared
- Supports configurable whitespace and case handling
- Library can be embedded with an API
- Free open-source licenses are available
Against
- Does not support three-way merge
- Built-in syntax highlighting is not supported
- Saved diffs are public to anyone with the link
- Angular component is out of date
The verdict
Mergely covers two-document comparison and merging, with browser-side processing and an embeddable library. Its sharing model and lack of three-way merge or built-in syntax highlighting are important considerations.
Who it suits
It suits people comparing or merging two text documents in a browser, as well as developers embedding diff and merge functions in web applications. Users who need built-in syntax highlighting or three-way merge should note those limits.
Plans and prices
Open-source license
GPL · LGPL · MPL
Read 8 Oct 2026 · mergely.com
Closed Distribution License (CDL)
Lifetime license for prior releases and releases in the following year · 1 year of personal email support
Read 8 Oct 2026 · mergely.com
On the record
- Browser processing
- Mergely computes differences in the browser using JavaScript, without server calls for the comparison.mergely.com · read 8 Oct 2026
- Comparison
- It shows two documents side by side and highlights added, deleted, and changed text.mergely.com · read 8 Oct 2026
- Diff features
- Options include ignoring whitespace, case, or accented characters, line numbers, line wrapping, and sidebars.mergely.com · read 8 Oct 2026
- Embedding
- The library can be embedded in a web application and provides an API for integration.mergely.com · read 8 Oct 2026
- File privacy
- The maker says imported documents stay in the browser unless the user saves or shares them.mergely.com · read 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.mergely.com · read 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.mergely.com · read 8 Oct 2026
- Licensing
- Mergely is distributed under GPL, LGPL, and MPL open source licenses, with a CDL available by contacting the maker.mergely.com · read 8 Oct 2026
- Merge controls
- The API can merge a whole document or the current change from one side to the other.mergely.com · read 8 Oct 2026
- Purpose
- Mergely is a browser based diff and merge editor and JavaScript library for comparing and merging text.mergely.com · read 8 Oct 2026
- Sharing
- Saved diffs are public to anyone with the link, who can view and manage the share.editor.mergely.com · read 8 Oct 2026
- Support
- The maker directs users to GitHub issues for support, and the CDL includes one year of personal email support.mergely.com · read 8 Oct 2026
- Supported browsers
- The maker lists Firefox, Chrome, Edge, and Safari as supported HTML5 compatible browsers.mergely.com · read 8 Oct 2026
