Web tools

    Everyday utilities for building and debugging the web.

    URL encoder / decoder

    Percent-encode and decode URL strings and query components.

    HTML entity escaper

    Escape and unescape HTML entities so markup can be shown as text.

    URL parser

    Break a URL into protocol, host, port, path, query parameters and hash.

    Device information

    Show everything the browser reveals about your screen, device and connection.

    Basic auth generator

    Build an HTTP Basic Authorization header from a username and password.

    Open Graph meta generator

    Generate Open Graph and Twitter card meta tags for a page.

    OTP code generator

    Derive TOTP codes from a Base32 secret and build the matching otpauth URI.

    MIME type lookup

    Look up the MIME type for a file extension, or the extensions for a MIME type.

    Keycode info

    Press any key to see its JavaScript key, code, keyCode and modifiers.

    Slugify string

    Turn any string into a clean, URL-safe slug.

    User-agent parser

    Parse a user-agent string into browser, engine, OS and device.

    HTTP status codes

    Searchable reference of every HTTP response status code and its meaning.

    JSON diff

    Compare two JSON documents and list every added, removed and changed path.

    JWT parser

    Decode a JSON Web Token and inspect its header, payload and claim dates.

    Safelink decoder

    Recover the original URL from an Outlook SafeLinks or similar wrapped link.

    Everything here runs on your machine

    These 15 web tools are plain client-side JavaScript served as static files. There is no backend to receive what you paste, no account to create and no usage limit. Open your browser's network panel while you work and you will see the page load, then nothing else.