4 Best Free Online JavaScript Deobfuscator Websites

Here is a list of the best free online JavaScript Deobfuscator websites. JavaScript obfuscation is a process to convert JavaScript code into a complex and difficult-to-understand presentation. And JavaScript deobfuscation is completely opposite of that. It is a process that removes all the added difficulties and turns the input back to readable JavaScript code. A JavaScript Deobfuscator is a tool that can help you with this transformation.

This post covers 4 free websites with JavaScript Deobfuscator tools. These tools take the obfuscated JavaScript code as input and transform that into readable JavaScript code. All these tools are quick and simple to use. Some tools also come with options that allow you to configure the deobfuscation process. In the end, you get plain JS code that you can either download or copy.

My Favorite Online JavaScript Deobfuscator

Deobfuscate.io is my favorite website on this list to deobfuscate JavaScript online. This tool has a simple interface that is easy to use. It also offers configurations allowing you to set arrays, proxy functions, expressions, etc.

You can check out our other lists of the best free Online JavaScript Validator Websites, Online Javascript Obfuscator Websites, and Online JavaScript to Base64 Converter Websites.

Comparison Table:

Name	JS Input	Obfuscate Proess	Output
Deobfuscate.io	Paste	Configurable	Copy
SEOSniffer.com	Paste	Configurable	Copy
Deobfuscate.relative.im	Paste	Automatic	Save JS
dCode.fr	Paste	Automatic	Copy/Save TXT

Deobfuscate.io

Deobfuscator.io is a free online JavaScript Deobfuscator website. It offers a simple tool that converts the JavaScript code into a new readable code presentation. This tool offers a set of configurations covering unpack/remove unpack arrays, unpack/remove proxy functions, simplify expression, remove dead branches, beautify, simplify, and rename hex identifiers. You can configure these options as per your liking and then deobfuscate the code. It shows the resulting presentation in the output box from there you can copy that to the clipboard.

How to deobfuscate JavaScript online with Deobfuscator.io?

Open this website in your browser or follow the direct link given below.
Add the JS code directly into the Input section.
Then configure the deobfuscate options as per your liking.
After that, click the Deobfuscate button to get the output.

Highlights:

Input Method: Paste.
Transformation Options: Arrays, Proxy Functions, Expressions, Beautify, Simplify, Rename Hex Identifiers, etc.
Output: Copy.

Home Page

SEOSniffer.com

SEOSniffer is a website where you can deobfuscate JavaScript online. This tool has an input and an output section placed vertically. Below the boxes, you get configuration options. It lets you unpack/remove unpack arrays, unpack/remove proxy functions, simplify expressions, remove dead branches, beautify, simplify, and rename hex identifiers. You can toggle these options as per the requirement and then paste the JavaScript and deobfuscate that instantly.

How to deobfuscate JavaScript online with SEOSniffer?

Use the link given below to open this tool directly.
Paste or type your JS code into the editor and configure the options if required.
After that, click the Deobfuscator button to get the deobfuscated output.

Highlights:

Input Method: Paste.
Transformation Options: Arrays, Proxy Functions, Expressions, Beautify, Simplify, Rename Hex Identifiers, etc.
Output: Copy.

Home Page

Deobfuscate.relative.im

Deobfuscate.relative.im is a free online tool to deobfuscate JavaScript online. This has a page-wide input section at the top. You can simply paste your input in that section and run the tool. It takes a moment to process the input and then shows the status of deobfuscation. When successfully deobfuscated, it does not show the output. But you can use the Save button to download the output as a TXT file.

How to deobfuscate JavaScript online with Deobfuscate.relative.im?

Use the link mentioned below to open this tool in your browser.
Add the JS code into the editor at the top.
After that, use the Deobfuscate button to perform the task and use the Save button to download the output.

Highlights:

Input Method: Paste.
Configuration Options: None.
Output: Download TXT.

Home Page

dCode.fr

dCode.fr offers well over 800 tools to help with various problem-solving tasks such as solving puzzles, deciphering coded messages, and performing mathematical calculations. It has a free online Javascript Unobfuscator that you can use to deobfuscate JS code online. It does not offer configuration options. You can simply add the input and run the tool. After that, it shows the output on the left side of the screen. Above the output, you get multiple options to save it. You can copy, print, and download the output as a TXT file.

How to deobfuscate JavaScript online with dCode.fr?

Go to the direct link given below to open this tool in your browser.
Paste your JS code into the editor.
Then click the MAKE READABLE/NATIVE button to get the output.

Highlights:

Input Method: Paste.
Configuration Options: None.
Output: Copy, Download, and Print.

Home Page

Frequently Asked Questions

What is JavaScript Deobfuscator?

JavaScript Deobfuscator is a tool used to reverse the process of obfuscation applied to JavaScript code, making it easier to understand and analyze. It helps developers and security researchers to decipher obfuscated JavaScript for debugging, auditing, and gaining insights into third-party scripts.

Can you Deobfuscate JavaScript?

JavaScript deobfuscation can be done manually by experienced developers or through the use of specialized tools and techniques designed for code analysis and reverse engineering.

Can you reverse obfuscation?

It is possible to reverse engineer obfuscated code.

How to avoid JavaScript errors?

To avoid JavaScript errors thoroughly test your code and handle potential edge cases to catch errors early in the development process. Use proper coding practices, validate inputs, and implement error handling mechanisms like try-catch blocks to gracefully handle unexpected situations.

Why is JavaScript obfuscated?

JavaScript is obfuscated to make the code more challenging to understand and reverse-engineer. It helps protect intellectual property, prevent code theft, and enhance security by hiding implementation details and making it harder for malicious actors to exploit vulnerabilities in the code.

How do Deobfuscators work?

Deobfuscators work by analyzing obfuscated code and applying techniques to reverse the transformations made during the obfuscation process. They might use pattern recognition, code pattern detection, and various algorithms to reconstruct the original, human-readable code, making it easier to understand and analyze.

Is obfuscated code safe?

Obfuscated code can provide a certain level of security by making it harder for casual readers to understand the code and reverse-engineer it. However, it is not a foolproof method of protecting sensitive information or critical algorithms, as determined attackers can still deobfuscate the code with enough effort and time.

What is difference between masking and obfuscation?

Masking and obfuscation are both techniques used to protect sensitive data, but they serve different purposes. Masking involves hiding specific data elements (e.g., credit card numbers) while preserving the overall format, whereas obfuscation aims to make code or data difficult to understand by transforming its structure, variables, or naming conventions.

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