Security Tools — Free Online Utilities
Security tools are where running in the browser matters most, and everything in this category does. The Advanced Password Generator creates cryptographically secure passwords with control over length and character sets, and the Random Passphrase Generator builds memorable passphrases from a built-in word list and shows their entropy; the Password Entropy Calculator and Password Security Auditor estimate how long an existing password or list of passwords would take to crack and point out common patterns. Text Encryptor / Decryptor encrypts a message with a password using AES-GCM through the WebCrypto API, and File Hash Calculator computes SHA-1, SHA-256 and SHA-512 digests of a local file so you can verify a download against a published checksum. The TOTP Code Generator produces 2FA codes from a Base32 secret — useful when you need to test an authenticator setup. Hash Identifier guesses the algorithm behind a hash string, the HTML Sanitizer strips scripts and dangerous attributes from markup, and the Caesar and Vigenère cipher tools are for learning classical cryptography rather than protecting anything. The Local Password Manager keeps entries in your browser's storage only. In every case the secret you type is processed on your device and never sent to BoxTool; you can confirm this by loading the page and then disconnecting from the network.
All 9 Security tools
Encode or decode text using the classic Caesar cipher shift algorithm.
Clean HTML and remove XSS / dangerous code
Paste a hash string and identify what algorithm it likely is.
Store and manage passwords locally in your browser — nothing sent to any server.
Audit a list of passwords for strength, entropy, common patterns, and get detailed security recommendations for each one.
Generate strong, memorable passphrases from a built-in word list with entropy display.
Generate TOTP 2FA codes from a Base32 secret — no app needed.
Encrypt and decrypt text with a password using AES-GCM and WebCrypto — fully client-side.
Encrypt and decrypt text with the Vigenère cipher and explore classical ciphers.