Minify HTML, CSS or JavaScript locally using self-hosted parsers. Review byte totals, cancel pending processing and download the result without running pasted code.
Source is processed on your device by self-hosted parsers with no uploads, accounts or saved input history. The output is plain text, never rendered or executed. A disposable worker supports cancellation, a time limit and discarding old results after edits.
HTML uses html-minifier-terser 7.2.0, CSS uses CSSO 5.0.5, and JavaScript uses Terser 5.51.2. Browser bundles are self-hosted with verified npm tarball integrity and retained license notices. JavaScript compression and name mangling are disabled. CSS structural rule restructuring is disabled, though syntax and value optimizations still occur. Only the selected parser is loaded in the worker.
Ordinary HTML comments are removed. Text-whitespace collapsing starts off; enable it only when appropriate for your page. The parser cannot infer every CSS white-space or layout rule. Inline scripts, event handlers, CSS and URLs are not minified or fetched in HTML mode. Attribute quotes, optional tags and redundant attributes are not intentionally removed. This is not a template-language processor or HTML validator.
Special /*! comments are retained. JavaScript also uses Terser’s special license/preserve comment handling, while HTML retains recognized license/preserve/copyright notices and special directive comments. CSS retains exclamation comments; other comment styles can be removed. Do not assume every legal or tooling directive comment survives. Review notices and build-system annotations in the output.
No pasted code is executed or rendered, and this workflow does not resolve URLs, import stylesheets, download scripts or generate source maps. Results stay in readonly textareas. The HTML bundle includes upstream browser shims, but its inline minification and URL-processing paths are disabled. The site’s content security policy also blocks network connections.
Use plain HTML, CSS or JavaScript supported by the bundled parser versions. Sass, Less, JSX, TypeScript and template languages are not supported. JavaScript module mode is available. Parser acceptance is not full standards validation or proof of runtime equivalence. New syntax and browser-specific constructs may need your normal build tools.
Input accepts 200,000 UTF-16 source units and output is limited to 500,000. A five-second deadline includes library loading and parsing; cancel, edits or page exit terminate work. Errors and timeouts expose no partial output. Unpaired surrogates are rejected to avoid UTF-8 export substitution. Totals measure uncompressed UTF-8 bytes, not gzip/Brotli savings; output can occasionally grow. Clear keeps settings and Example resets language-specific checkboxes.
