CyberChef

CyberChef is a web application developed by GCHQ for carrying out all manner of cyber operations within a web browser. It provides over 300 operations covering encoding/decoding (Base64, URL, hex, HTML entities), encryption/decryption (AES, DES, RSA, XOR), compression (gzip, bzip2, zlib), hashing (MD5, SHA, HMAC), data format conversion (JSON, XML, CSV, YAML), networking (IP parsing, URL parsing, HTTP headers), language operations (regex, character encoding, Unicode), and analysis (entropy, frequency, magic detection). Operations are chained together in a visual 'recipe' that processes data through each step sequentially, making it easy to build complex transformation pipelines. CyberChef's 'Magic' operation automatically detects the encoding or format of input data and suggests relevant operations. It runs entirely client-side - no data leaves the browser - making it safe for processing sensitive material. CyberChef is an essential daily tool for SOC analysts, malware researchers, and CTF players.