JavaScript Minifier

Compress, minify, and optimize JavaScript code online for free. Remove unnecessary whitespace, indentation, and comments to reduce script bundle size and boost Core Web Vitals.

JavaScript Minifier

Compress and shrink JavaScript code by removing comments, blank lines, and whitespace.

Presets:

Original Size

1,057 B

Minified Size

568 B

Saved Space

-489 B

Compression

46%

Source JavaScript:

// Asynchronous API fetcher with retry logic
async function fetchWithRetry(url, options = {}, retries = 3, backoffMs = 500) {
    /* 
       Attempts request up to specified retries
       with exponential backoff
    */
    for (let attempt = 1; attempt <= retries; attempt++) {
        try {
            const response = await fetch(url, {
                ...options,
                headers: {
                    'Accept': 'application/json',
                    'Content-Type': 'application/json',
                    ...(options.headers || {})
                }
            });

if (!response.ok) {
                throw new Error(`HTTP ${response.status}: ${response.statusText}`);
            }

return await response.json();
        } catch (error) {
            console.warn(`Attempt ${attempt} failed: ${error.message}`);
            if (attempt === retries) {
                throw error;
            }
            await new Promise(resolve => setTimeout(resolve, backoffMs * Math.pow(2, attempt - 1)));
        }
    }
}

Minified Output (.min.js):

async function fetchWithRetry(url,options={},retries=3,backoffMs=500){for(let attempt=1;attempt<=retries;attempt++){try{const response=await fetch(url,{...options,headers:{'Accept':'application/json','Content-Type':'application/json',...(options.headers||{})}});if(!response.ok){throw new Error(`HTTP ${response.status}: ${response.statusText}`);}return await response.json();}catch(error){console.warn(`Attempt ${attempt} failed: ${error.message}`);if(attempt===retries){throw error;}await new Promise(resolve=>setTimeout(resolve,backoffMs*Math.pow(2,attempt-1)));}}}

Zero-latency, 100% in-browser JavaScript minification.Safe token preservation (ES6 template literals, regex, strings)

How to use JavaScript Minifier

1
Paste your unminified JavaScript or ECMAScript code into the input editor.
2
The tool instantly compresses your code in real time, stripping redundant spaces, blank lines, and comments.
3
View the live compression statistics, including original bytes, minified bytes, and percentage saved.
4
Click "Copy Minified" to copy directly to your clipboard or "Download .min.js" to save the production script file.

Why use this tool?

High-Efficiency Compression

Drastically reduce script transfer sizes for faster web asset downloads and improved Google PageSpeed performance.

Safe Token Preservation

Intelligently respects single quotes, double quotes, ES6 template literals, and regular expressions without breaking syntax.

Real-Time Compression Metrics

Instant feedback displaying character count savings, byte reduction, and overall compression ratio.

Zero Latency & 100% Client-Side

All minification runs locally inside your browser with immediate execution and zero data transmission.

Frequently asked questions

Will minifying my JavaScript break regular expression literals or strings?

No. The tokenizer carefully detects string boundaries (including multi-line backtick template strings) and regex expressions, ensuring string contents and flags remain completely intact.

What is the difference between JavaScript Minifier and UglifyJS / Terser?

This tool provides zero-install, instantaneous client-side minification and comment stripping without needing Node.js or npm packages. For advanced variable name mangling and dead-code elimination, build tools like Vite and esbuild can be used in your CI pipeline.

Can I reverse the minification back to readable code?

Yes! The tool includes a "Beautify / Unminify" button to format minified single-line scripts back into clean, indented code.

Related tools

Developer Tools

JavaScript Minifier

JavaScript Minifier

How to use JavaScript Minifier

Why use this tool?

High-Efficiency Compression

Safe Token Preservation

Real-Time Compression Metrics

Zero Latency & 100% Client-Side

Frequently asked questions

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