JS Obfuscator
Obfuscate JavaScript online: variable renaming, string encoding, whitespace removal. Before/after comparison with size stats. Free JS obfuscator.
Why Use a JavaScript Obfuscator?
JavaScript obfuscation transforms your code into a version that is much harder to read and reverse-engineer, while still functioning identically. This protects intellectual property, discourages casual code theft, and adds a layer of security to client-side applications. Our tool offers multiple obfuscation techniques you can toggle individually.
Key Features
- Variable renaming: replace meaningful names with short, meaningless identifiers
- String encoding: convert string literals to hex escape sequences
- Remove whitespace and comments for compact output
- Basic control flow flattening with IIFE wrapping
- Before/after comparison with file size statistics
How It Works
- Paste your JavaScript code in the editor
- Toggle the obfuscation techniques you want to apply
- See the obfuscated output and size comparison instantly
- Copy the obfuscated code for use in your projects
Technical Details
This tool implements client-side obfuscation using regex-based transformations. Variable renaming identifies declared variables and function parameters, then replaces them with short generated names while preserving reserved keywords. String encoding converts characters to hex escape sequences (\xHH). Control flow flattening wraps code in an IIFE. No external libraries or server processing is used.
Frequently Asked Questions
Is obfuscated code still executable?
Yes! Obfuscation transforms the code into a functionally equivalent version. The obfuscated code runs exactly the same as the original — it's just much harder for humans to read and understand.
Does obfuscation protect against determined reverse engineering?
Obfuscation adds a significant barrier to casual code inspection but is not encryption. A determined attacker with enough time could reverse-engineer obfuscated code. It's best used as one layer in a broader protection strategy.
Related tools
Regex Tester & Debugger
Test regular expressions with match highlighting, groups, and common patterns
HTML Meta Tag Generator
Generate SEO-optimized HTML meta tags for your website
cURL to Code Converter
Convert cURL commands to JavaScript, Python, and PHP code
QR Code Generator
Generate QR codes from text or URLs with customizable colors and size
Cron Expression Parser
Parse cron expressions into human-readable descriptions and see next execution dates
IP Address Info
Show your current IP, validate IPv4/IPv6, detect IP class, and calculate CIDR notation