You have JavaScript. You need a bookmarklet. This does that.

Features

• Removes newlines, tabs, optional spaces, and comments
• URL-encodes special ASCII characters: [space], %, ", <, >, #, @, &, ?
• Places code in a wrapper function (if not done already)
• Does not hex-encode non-ASCII characters (you should probably use String.fromCharCode for that)

Use it

License

This is free software. It is released to the public domain without warranty.