JS & URL Deobfuscator

JavaScript obfuscation is the process of transforming readable JS code into a difficult-to-understand form while preserving its functionality. Attackers use it to hide malicious payloads in phishing kits, exploit kits, and web shells. Common techniques include Base64 encoding, hex/unicode escapes, eval() wrappers, String.fromCharCode(), and string concatenation.

Yes, this tool is completely safe. It runs 100% in your browser — no data is sent to any server. It performs static text transformations only and never executes the JavaScript being analyzed. Your data stays on your machine at all times.

Absolutely. This tool is designed for SOC analysts, threat researchers, and DFIR professionals to safely deobfuscate malicious JavaScript found in phishing kits, exploit kits, web shells, and malicious Office documents. Since it only performs static analysis, the malicious code is never executed on your system.

URL defanging is a cybersecurity practice that makes URLs non-clickable by replacing characters — for example, https becomes hxxps and dots become [.]. This prevents accidental navigation to malicious sites when sharing IOCs in reports, emails, or chat. This tool reverses defanging so you can analyze the original URLs safely.

Mlab is a full IOC & File Intelligence Platform. Beyond this deobfuscator, you can scan IPs, domains, and file hashes, use the MITRE ATT&CK mapping tool, scan websites for vulnerabilities with RedKit, parse suspicious emails with the EML Parser, and build detection rules with the YARA and Sigma rule builders. Create a free account to get started.