Free online JavaScript tools (beautify, minify, lint)

Free online JavaScript tools help you beautify, minify, and lint JS without installing an IDE plugin. Jigglify runs everything privately in your browser - nothing uploaded - so you can format and check snippets quickly.

Beautify, minify, and lint online

• Free online JavaScript beautifier - pretty-print and format JS with indent and wrap options
• Free online JavaScript minifier - compress JS to shrink payloads
• Free online JavaScript linter - quick syntax and common-issue checks (not full ESLint)

Typical workflow

1. Lint first if the snippet might have syntax errors.
2. Beautify when you need readable structure (Ctrl/Cmd+Enter on the beautifier).
3. Minify when you need a smaller script for embed or transfer.

Start with free online JavaScript beautify - private formatting in your browser.
Open the free JS Beautifier →

Related: Beautify JavaScript online · Minify JavaScript online · JS tools cheat sheet