Zoven

JS Minifier

Minify and compress JavaScript code online

What is the JS Minifier?

The js minifier works like this: it minifies JavaScript by stripping comments and whitespace and applying safe token-level squeezing. Everything happens on your device - the input never leaves your tab unless the tool clearly states it performs a server-side lookup.

How to use the JS Minifier

1. Paste the input (code, data or query).
2. Run the operation - formatting and validation are instant.
3. Read any validation message before trusting the output.
4. Copy the result into your project.

Features

• Instant client-side formatting and validation
• No telemetry on your data
• Copy-ready output with proper escaping

Common mistakes to avoid

• Using the wrong input dialect (JSON vs JSON5, cron 5 vs 6 fields)
• Copying output without checking escaping

Examples

Input	Result
Readable 40 KB script	~60% smaller with identical behavior for ES2020 syntax

Best used for

• Getting a reliable answer for js minifier without installing an app
• One-off tasks done in under a minute from any device
• Checking results before committing them to something important
• Working on a phone where desktop software is unavailable

Privacy

All parsing and transformation happens locally in this tab - your code and data are not sent anywhere.

Frequently asked questions

Is it as good as Terser?

It applies the safe subset - whitespace, comments, token squeezing. Full mangling/dead-code elimination needs build-time Terser.

Is the minified JavaScript guaranteed to work identically?

The minifier only strips comments and whitespace and applies safe token-level squeezes - no renaming or restructuring - so behaviour is preserved. Always smoke-test a minified bundle on staging anyway.

How much size does minification typically save?

Roughly 30-50% on hand-written code with comments and indentation; already-terse code compresses less, and gzip on top shrinks it further still.

More like this

Zoven offers 200+ free browser tools. Browse by category - Calculators, Converters, Generators, Developer Tools and Media Tools - or read workflow guides on the Zoven blog.