Free online security and privacy tools

Runs a set of checks on a URL, such as DNS, SSL, headers, ports and tech stack, and shows the results.

Demo of the open-source FingerprintJS library that computes a visitor ID from browser attributes.

Drag-and-drop recipe builder that chains hundreds of operations for encoding, encryption, compression and data analysis.

Zero-knowledge pastebin where text is encrypted in the browser before being stored, with expiry options.

Builds scripts that harden privacy and security settings on Windows, macOS and Linux, chosen by checkbox.

Shares passwords through links that expire after a set number of views or days.

Encrypts a secret in the browser and gives a short-lived link that can be opened once.

Creates a link to a secret message that can be opened only once.

Probes browser APIs to expose fingerprinting signals and detect spoofing or privacy tools.

Chains encoders, decoders and ciphers in a modular pipeline, with conversions running in the browser.

Encrypts files and splits the key among trusted people so a chosen number must combine shares to open them.

Creates self-destructing encrypted notes and files that can be viewed a limited number of times.

Moves files or text between devices as a series of QR codes, with no network link between them.

Produces recommended TLS configuration snippets for web servers, databases and mail software.

Creates diceware passphrases in the browser with a choice of word lists and entropy display.

Scans a site for third-party requests, cookies, security headers and other privacy issues.

Demo page for the totp.js library that generates TOTP codes in the browser.

Generates look-alike domain permutations for a domain and checks which are registered, to spot phishing.

Generates secure diceware passphrases from word lists in the browser.

Browser-based 2FA code generator offered as an alternative to authenticator phone apps.

React app that creates secure random passwords and passphrases with length and character options.

Single-file web page that produces TOTP codes from your secret without an account.

Encodes and decodes the affine cipher with chosen coefficients.

Encodes and decodes with a custom alphabet substitution.