JavaScript Minifier
Basic JavaScript minifier — strips comments and extra whitespace.
- Reading time:
- 2 min
- Last updated:
- Price:
- Free, no signup
Type or paste text to see the result.
What the JavaScript Minifier does
Paste readable JavaScript and receive a compressed version with whitespace, line breaks and comments taken out. A 60 KB script often lands a third lighter, and it runs exactly the same.
The minified code keeps your logic and variable behavior intact — only the parts humans need are removed.
Why the JavaScript Minifier is useful
JavaScript is often the heaviest part of a page, and every byte is downloaded, parsed and executed on every visit. Shipping development-formatted code to production wastes your visitors' time and data.
Stripping comments also matters: production code shouldn't carry internal notes, TODOs or explanations meant for the team.
Also known as: javascript minifier, js compressor, free javascript minifier, online javascript minifier, javascript minifier online free, javascript minifier tool, best javascript minifier tool.
How to use the JavaScript Minifier
- 1
Paste your script
Drop in the readable source file.
- 2
Minify
Extra spacing and comments vanish instantly.
- 3
Copy the production version
Deploy the small file; keep the original for development.
Key features
- Strips comments and excess whitespace
- Preserves code behavior exactly
- Shows size before and after
- Runs locally — proprietary code stays private
Benefits
- Faster page loads with smaller scripts
- Remove internal comments from production
- Prepare libraries for distribution
Real-life use cases
Launching a site
A developer minifies three custom scripts before go-live, cutting 90 KB of JavaScript down to 58 KB.
Sharing a snippet
A blogger minifies a widget script so readers can paste a single compact line into their sites.
Cleaning a purchased plugin
A developer clears out a vendor's debug comments before deploying the script.
Tips for the best results
- This strips out spacing and comments but doesn't rename variables — use a full bundler like esbuild or Terser for maximum compression.
- Test the minified output before deploying; aggressive minification can expose missing semicolons.
- Keep source maps or at least the original file, or debugging production errors becomes guesswork.
Conclusion
Paste the readable script, take the compact one, and ship less JavaScript.
Frequently asked questions
Does minification change what the code does?
- No — spacing and comments go, nothing else. The logic runs identically.
What savings should I expect?
- Usually 20–40% for well-formatted source. Heavily commented files compress more.
Is this the same as obfuscation?
- No. Obfuscation renames variables to hide logic; minification only removes formatting. Your code remains readable to anyone determined.
Can I un-minify the result?
- Use the JavaScript Beautifier to restore formatting, but stripped comments are gone permanently.
Do I compress files I'm still editing?
- Keep your working files readable and compress only what you ship to production.
Does my script leave this page?
- Never — the work is done inside your own browser.
Related tools you may need
- CSS Minifier — Strip whitespace and comments from CSS in one click.
- HTML Minifier — Strip whitespace and comments from HTML.
- JavaScript Beautifier — Reformat minified JavaScript with two-space indentation.
- JPG Compressor — Compress JPG images at your chosen quality.
- PNG Compressor — Re-encode PNG images to reduce file size.
- SVG Optimizer — Strip comments, metadata and whitespace from SVG.
- CSS Beautifier — Reformat compressed CSS with clean two-space indentation.
- CSV to JSON Converter — Turn CSV rows into a JSON array of objects.
Keep exploring
Browse the full tools directory, filter by category, or read guides on the Text Tools Hub blog.