Free JavaScript Minifier that works offline
Reduce a small standalone script without uploading source code or installing a build pipeline.
What this javascript minifier does
Safe JavaScript minification normally requires a full parser. This browser utility intentionally performs conservative cleanup and avoids aggressive rewriting that could change meaning.
How to use the JavaScript Minifier
- Enter or paste a small JavaScript source snippet into the tool.
- Adjust the available options so they match the format and result you need.
- Choose Minify JavaScript and review a compact source version and size comparison before using it.
- Copy or download the result, then clear the page if the input was sensitive.
Common uses
- Compressing small bookmarklet-like snippets
- Comparing readable and compact examples
- Preparing embedded demo code
- Removing comments before sharing a local sample
Private processing and offline access
This tool does not submit your input to a conversion server. Processing takes place inside the browser using local JavaScript and standard Web APIs. After the PWA has been installed or cached, the page and its core features remain available without an internet connection. Closing or clearing the page removes unsaved input; the tool does not create an account or cloud history.
Tips for accurate results
- Always test the minified result.
- Use a production bundler for application code.
- Keep the original source and source maps when debugging matters.
Frequently asked questions
Does this tool upload my data?
No. JavaScript Minifier processes its input in the current browser and does not submit it to a conversion API.
What input does the JavaScript Minifier accept?
Ordinary scripts are supported. Complex automatic semicolon insertion, embedded languages and build-time syntax require a production parser.
Can I use this tool offline?
Yes. Once the Offline Tools PWA has cached the page, the core feature works without an internet connection.