Merge JS Files Online



Free online JavaScript merger - concatenate JS files

Convert directly in your browser, with no upload waiting time, and no risk of data leaks.

Simply choose your JS files and the tool will merge them into one JS file for you!

Choose JS Files to Merge

JS Files:
(Max 10 files, 100M total.)
(More than 10 files? Big than 100M total?)
or drag & drop JS files here
 





How to Merge JavaScript (3 Steps)

  1. Choose your JS files. Select two or more .js files in execution order.
  2. Merge. The scripts are concatenated top to bottom so definitions load before use.
  3. Download the merged JS. Include the single file in your page.

Online vs App

Same job, two ways — pick the one that fits your file:

OnlineApp
Free✓Trial
No install✓—
No upload✓✓
Large files / batch✗✓
GUI✓✓
CLI—✓

In short: this page is best for a quick, small file. For large files or batch jobs, use the TextMerger desktop app — it also ships a command line for scripts and scheduled runs.

What to Know About JavaScript

  • Add dependencies first, because the browser executes the merged file top to bottom.
  • The output is not transpiled or bundled, so ES module syntax may still need a bundler.
  • Missing semicolons can break concatenation - add them before merging.
  • Everything happens locally; no script is uploaded.

Frequently Asked Questions

Does this replace a bundler?

No. It performs plain concatenation for classic scripts. For ES modules, tree shaking or transpiling use a real bundler.

Why does my script fail after merging?

A missing semicolon at the end of a file can join two statements together. Add semicolons, then merge again.

Is my code uploaded?

No, the merge runs in your browser.

Related Tools

Merge CSS files | Merge Markdown files | Merge text files | Merge shell scripts | Merge BAT files | Offline text merger

Need bigger files or batch conversion?

If this service cannot merge your data correctly, or your files are big than 100M, or more than 10 files at a time, you can merge JS files locally by this App: Text Merger, for Windows, Linux, and macOS.

Want to stay in the browser? Subscribe (from $5/month) to raise the online limits.

If you have any question or suggestion, please contact us.