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Code optimization

Code Minifier

Parse and minify JavaScript with Terser or CSS with CSSO while preserving valid program syntax.

  • Free to use
  • No account
  • Browser processing
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Purpose-built workflow

Reduce JavaScript or CSS source size

  • Terser JavaScript
  • CSSO CSS
  • Savings calculation
  1. InputPaste structured input
  2. RefineChoose parser and safe optimization settings
  3. ReviewReview minified code and reduction
  4. FinishCopy or download compact code

Code optimization

What does Code Minifier do?

Smaller JavaScript and CSS files load faster in production. This tool parses JavaScript with Terser or CSS with CSSO before applying standards-aware minification.

Minification runs in the browser, so your source code is never uploaded.

Minify JavaScript or CSS in one step.
Remove comments and extra whitespace to cut file size.
Minify locally without uploading your code.

Common use cases

Shrinking a small script before deploy
Minifying CSS for production
Reducing inline code size

Step-by-step

How to use this tool

  1. 1

    Add content to Code Minifier

    Paste the source data or code into the input.

  2. 2

    Configure the result

    Choose the transformation or validation option.

  3. 3

    Review and export

    Check the output, then copy the result for your project.

Tips for a better result

  • Start with a representative sample before running a large code minifier workflow.
  • Keep the original input until you have checked the downloaded or copied result.
  • Review quality, compatibility, and output size before publishing or sharing the result.

Keep working

Related workflows

All Developer Tools Format JSON, encode content, and handle common development utilities.JSON Formatter Format and validate JSON data with a clean developer-focused interface.CSV to JSON Migrator Detect common delimiters, validate quoted tabular data, preview rows, and export structured JSON objects.Regex Tester Engine Test regular-expression patterns against input and inspect every match.Diff Checker Compare two text or code blocks and highlight line-level differences.

Learn from primary sources

Trusted references

Use these standards and official guides when you need deeper technical detail.

JSON standard (RFC 8259) (opens in a new tab)The Internet standard that defines JSON syntax and interoperability.JavaScript JSON reference (opens in a new tab)MDN's reference for parsing and serializing JSON.

FAQ

Common questions

Everything you need to know before processing your files.

It focuses on removing comments and whitespace rather than aggressive renaming, keeping output predictable.

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Privacy and measurement

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