JavaScript Minifier

A simple JavaScript minify deletes comments and whitespace. It does not rename variables or bundle modules the way a compiler such as a production bundler does. Use this for a small script. Use your build tool for application code.

What you get from JavaScript Minifier is concrete. Comments and extra line breaks are removed. The byte savings are shown before you copy. The script is not sent to a build service. Read those results before you paste them into a template, a file, or a ticket. A copied mistake is harder to see later than a mistake still on this page.

A careful pass on JavaScript Minifier looks like this. Start with real input, not a placeholder you do not understand. Paste the JavaScript. Then check the middle of the form, because that is where optional fields change the output. Read the minified output. Finish by reading the whole result, not only the first line. Copy the result only if the script is simple enough for whitespace removal.

The limit is the part people skip on JavaScript Minifier. Match the output to the input you actually typed, then decide whether it belongs on the live site. No. The minified text is produced in the browser. The byte savings are shown before you copy.

A second reading of JavaScript Minifier is worth it because the first pass is easy to rush. Say out loud what the output is claiming. Comments and extra line breaks are removed. The byte savings are shown before you copy. The script is not sent to a build service. Then say what it is not claiming. No. It removes comments and whitespace. Use your build tool for application code. No. The minified text is produced in the browser. Original size, minified size, space saved, and the reduction. If those two speeches disagree, change the input or pick a different tool. JavaScript Minifier will not resolve the disagreement for you.

Read JavaScript Minifier once more as a single job. Part 1: Paste the JavaScript. Part 2: Read the minified output. Part 3: Compare original and minified sizes. Part 4: Copy the result only if the script is simple enough for whitespace removal. You should be able to point at this in the result: Comments and extra line breaks are removed. You should be able to point at this in the result: The byte savings are shown before you copy. You should be able to point at this in the result: The script is not sent to a build service. Does this rename variables the way a bundler does? No. It removes comments and whitespace. Use your build tool for application code. Is the script uploaded? No. The minified text is produced in the browser. What size comparison does the JavaScript minifier show? Original size, minified size, space saved, and the reduction. Who is JavaScript Minifier for? JavaScript Minifier is for someone already doing developer tools work who needs compress JavaScript files for faster browser execution. A simple JavaScript minify deletes comments and whitespace. It does not rename variables or bundle modules the way a compiler such as a production bundler does. Use this for a small script. Use your build tool for application code. The first field was filled with a real value: Paste the JavaScript. The result was read: Comments and extra line breaks are removed. Optional fields were either filled or left empty on purpose. The copy went into the place the last step names. The boundary in the guide was respected before anything was published.

Keep JavaScript Minifier as this step only. When the job moves on, the HTML Minifier is the next page: HTML Minifier removes extra whitespace, line breaks, and comments from HTML you paste and shows the original size, the minified size, and the reduction. The CSS Minifier covers a different piece of the same work: CSS Minifier removes comments, spaces, and line breaks from CSS you paste and shows how many bytes that saves.