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JavaScript Minifier

Minify JavaScript with Terser, including optional name mangling.

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Input

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Settings

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Run

4

Results

Results will appear here once you run the tool.

About JavaScript Minifier

Minify JavaScript with Terser, including optional name mangling. Paste or type your text into JavaScript Minifier, adjust the settings, and the result appears below.

Your files stay on your device. ZyncTools has no upload step: the file is read in your browser, processed there, and handed straight back to you. There is no account, no watermark and no size cap beyond what your own device can hold.

Settings. JavaScript Minifier gives you control over shorten local variable names, apply compression passes, remove console.* calls, remove debugger statements, keep class names and output syntax.

Also known as: javascript, js, minify, compress, terser, uglify.

How to use JavaScript Minifier

  1. Add your input. Paste or type your text into the input box. You can also load a text file from your device.
  2. Choose your settings. Adjust shorten local variable names, apply compression passes, remove console.* calls and the other 3 settings to suit what you need.
  3. Run the tool. Press Run. Processing happens on your own device, so the time it takes depends on your machine rather than a queue.
  4. Save the result. Copy the output, or press Download to save it. Nothing is kept once you close the tab.

Frequently asked questions

Are my files uploaded when I use JavaScript Minifier?

No. JavaScript Minifier runs entirely inside your browser. Your text is read locally, processed on your own device, and handed straight back to you. You can confirm this yourself: open your browser's developer tools, watch the Network tab, and run the tool — no request carries your data anywhere.

Is JavaScript Minifier free?

Yes, completely. No account, no sign-up, no watermark on your output, and no cap on how many times you can use it. The project is open source under the AGPL licence.

Does JavaScript Minifier work offline?

Mostly. The site caches itself after your first visit, so it keeps working without a connection. Tools that need a specialised library — PDF editing, OCR, QR codes, MP3 encoding — need a connection the first time you run them, then that library is cached too.

Related code & data tools

JSON Formatter & Validator Pretty-print, validate and minify JSON with clear error positions. JSON Path Finder List every path in a JSON document, or query it with a dot path. YAML ⇄ JSON Converter Convert YAML to JSON and back, in either direction. XML Formatter Pretty-print, validate or minify XML documents. XML ⇄ JSON Converter Convert XML into JSON and JSON back into XML. CSV ⇄ JSON Converter Convert CSV to JSON records and JSON arrays back to CSV.