Code Deobfuscator — JavaScript Decoder
Deobfuscate JavaScript by decoding hex and unicode escape sequences, expanding eval(atob()) and eval(unescape()) patterns, folding string concatenation, and converting hex numbers — all in your browser.
How to Use Code Deobfuscator — JavaScript Decoder
How to Use the Code Deobfuscator
Step 1: Paste Obfuscated JavaScript
Paste your obfuscated JavaScript code into the input field. The tool processes it in real time as you type or paste. You can also click one of the example buttons to load a preset:
- Hex & Unicode — variables and strings encoded with
\xand\uescape sequences - eval(atob()) — base64-encoded payload wrapped in an eval call
- eval(unescape()) — percent-encoded payload wrapped in an eval call
- String Concat — obfuscated method names built by concatenating string literals
Step 2: Choose Deobfuscation Passes
Toggle individual passes on or off to control what transformations are applied:
- Decode \x / \u — replaces
\x41withAand\u0041withAinside string literals - Expand eval(atob()) — base64-decodes the argument and replaces the eval call with the decoded source, wrapped in a comment
- Expand eval(unescape()) — percent-decodes the argument and replaces the eval call with the decoded source
- Fold "a"+"b" — collapses adjacent string literal concatenations into a single string
- 0xFF → 255 — converts hexadecimal number literals to their decimal equivalents
- Basic Format — adds indentation and line breaks to make the output readable
Step 3: Copy or Download the Result
Click Copy JS to copy the deobfuscated output to your clipboard, or Download .js to save it as a .js file.
Limitations
- Does not execute code — complex runtime obfuscation patterns (string array rotators, self-modifying functions) are not resolved
- Hex number conversion (
0xFF → 255) is applied globally and may also affect hex numbers inside string literals - For deeply obfuscated code, multiple paste-and-deobfuscate passes may be needed
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