Javascript Obfuscator

Javascript Obfuscator, Compressor
and Minifier

Scramble, obfuscate, and pack JavaScript code!
Javascript Obfuscator converts the Java Script source code into completely unreadable form, preventing your code from analysing and theft. It's a 100% safe Java Script minifier and the best JavaScript compressor in the web.


Javascript Obfuscator can

  • compress .js files using an unique compression algorithm with impressive compression ratio;
  • remove comments, line feeds and white spaces, reducing the file size and minimizing the loading time;
  • add finishing ";" when it's necessary;
  • create a list with names of your functions and variables;
  • generate new unintelligible names and rename functions and variables depending on the selected settings;
  • command line support.

Javascript Obfuscator vs. JSMin & YUI Compressor

 JSMinYUI CompressorJavascript Obfuscator
Jquery 1.3.2
124 995 bytes
74 121 bytes
73 117 bytes
44 429 bytes
MooTools 1.2.2
   103 064 bytes
78 412 bytes
64 503 bytes
47 026 bytes
   130 349 bytes
93 955 bytes
73 511 bytes
48 244 bytes

How to Use

Interface Description


Reset All - Resets the existing project
Load Project - Loads projects created by Javascript Obfuscator
Save Project - Saves a current project
Add File - Opens .js or .efs files.
Delete File - Deletes .js or .efs files from the List of the files.
Start processing - Compress all files from List of files, saves a result and creates backup files
Restore source files - Restores a previous copy of files from .bak's 

List of Files

Shows the list of the files to be processed.
Use the right click for context menu (add/delete files or open a selected file in Notepad)
You can use drug-n-drop to add files to the list

Statistics, Options

Set Header - Adds a header comment to processed file.
Rename - If selected, new output files will be created with a defined suffix.
Rewrite source - If selected, source files will be rewitten by output files. Backup files with .bak extension will be created as well.
Compress - If checked, source code will be compressed.
Obfuscate names - If checked, variables will be renamed depending on "Names" list settings.

Rename Panel

Allows you to manage a changing of variable and function names the Javascript Obfuscator has found in project's files.
If Obfuscate names - checkbox is set the Javascript Obfuscator will rename variables and functions depending on "Names" list settings.
To rename in Manually - mode you should double click on a necessary name and type a new one.
To rename in Auto - mode you at first should mark the names in the Rename Panel. Use the right-click context menu for it.

After the necessary names are marked you can generate new names. You can add prefix, use letters or letter mix.

Read Names - Reads variable names from opened files.
Add prefix - Prefix will be used at the beginning of the generated name.
AaBbCc - All alphabet will be used for generated names, starting with "A" for name with max Count.
Letter mix - Chars from this charset will be used for generated names only. You can type your own set or select a pre-defined one.
Change names in string - If checked, variable names found in strings will be changed. Use with caution. Not fit for short or common names.
Generate Names - Generates new names for selected variables.

Command line support

jso.exe myproject.jo3 -opens myproject.jo3
jso.exe myproject.jo3 process -runs myproject.jsp and processes files depending on myproject.jo3 settings. Log is in myproject.log.
jso.exe myproject.jo3 process --files gallery.js gallery.dun.js items.js -runs myproject.jsp, adds gallery.js gallery.dun.js items.js files and processes files depending on myproject.jo3 settings. Log is in myproject.log.
jso.exe myproject.jo3 process --header headerfile.txt -runs myproject.jsp, defines header file and processes files depending on myproject.jo3 settings. Log is in myproject.log.

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Video Tutorial

Purchase JavaScript Code Obfuscator

Ordering online is easy and secure. You can select the most suitable payment method: credit card, bank transfer, check, PayPal etc.. Paying a license fee, you get the right to use the program for life and to get free updates within one year. After you complete the payment via the secure form, you will receive a license key instantly by email.
Secure payment processing by Plimus.

Plimus, Inc.
3830 Valley Centre Dr., Suite 705-294
San Diego, CA 92130
Tel: +1 (866) 312-7733
Tel: +1 (858) 350-7473;   Fax: +1 (858) 777-5553

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14-day trial periodYes--
Trial reminderYes--
Number of developers
Number of processing js files per session1
Save/Open project file -YesYes
Command Line Support-YesYes
Code obfuscatingYesYesYes
Code compressionYesYesYes
Download button
$345 $99

Postal Address

For general help, feature requests, troubleshooting contact Customer Support at . Make sure to include details on your browser, a link (or relevant code), operating system and Javascript Obfuscator version.draw back of packer javascript


    * I've been looking for a flexible obfuscator and I downloaded version 4.0 of your product. I walked through the example in the Step by Step and I really like the result. Thank you for a great javascript encrypt tool!

    * My company want to buy a tool to obfuscate our javascript source, and I download your trial version of JavaScript Obfuscator 4.0 to have a try. Command line interface is very usefull for us to automate the javascript optimization.

    * I have tried the evaluation version of your JavaScript obfuscator, everything went fine, it looks really nice. I really like the ability to add a comment header to each compress javascript file. I use this option to include a copyright notice in my commercial compiler vs google compiler

    * Hi all, I'm working on a new project, and this is the first time I've ever looked for a JavaScript obfuscator. I was trying to use the Javascript Obfuscator 4.0 trial version on my javascript file and as it appears to find and java script obfuscate all my variable and function names. Also it works very quickly even with big files.


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Highest compression

Javascript Obfuscator provides the best compression ratio
comparing with other minifires available on the Web. See the comparison table below.

minification vs packing javascript Compressors Applet

Unreadable code

Javascript Obfuscator generates new unintelligible names
and rename functions and variables
depending on the selected settings or pre-defined presets.
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Easy to use

Just drug-n-drop files to the program window and press "Process" button!


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How To's