All tools

Advanced passwords, passphrases and pronounceable secrets.

High-entropy signing secrets for JSON Web Tokens.

Encode, decode and inspect JSON Web Tokens in your browser.

Expiration countdown, issuer and audience checks, algorithm warnings and claim explanations.

Check tokens for weak secrets, long expiration, alg:none and missing issuer or audience.

Prefixed, readable API keys for your services.

SHA-1, SHA-256 and SHA-512 digests in the browser.

Create and verify SHA-256 and SHA-512 HMACs for webhook testing.

Paste a payload, secret and signature to verify Stripe, GitHub or generic webhooks locally.

Inspect X.509 certificates locally: expiration, subject, issuer, SANs and fingerprints.

Generate a private key and certificate signing request in your browser. The key never leaves the device.

Generate RSA and ECDSA key pairs locally with Web Crypto.

Pretty-print, minify and validate JSON in your browser.

Convert JSON and YAML in your browser. Nothing is sent to a server.

Paste JSON and generate TypeScript interfaces in your browser.

Paste JSON and generate a Zod schema for TypeScript and Node.

Paste JSON and test JSONPath expressions in your browser.

Format PostgreSQL, MySQL and SQL Server queries locally. Nothing is sent to a server.

Test regular expressions with match highlighting, capture groups, flags and explanations.

Compare two JSON, text or config files locally. Useful for API responses and configuration.

Parse and validate .env files, find duplicate keys, convert to JSON and check secret strength.

Convert text and files to and from Base64.

Percent-encode and decode URLs and query strings in your browser.

Encode and decode HTML entities in your browser.

Convert between hexadecimal, binary and decimal values locally.

Convert HEX, RGB and HSL colors and check WCAG contrast.

Convert text to camelCase, PascalCase, snake_case and kebab-case.

Escape and unescape JSON, JavaScript, HTML and regular-expression strings.

Convert timestamps to dates and back, with timezone conversion and seconds/milliseconds detection.

Bulk UUID v4 and v7 identifiers.

Generate time-sortable ULIDs locally, alongside UUID v7.

Generate Nano IDs with a custom alphabet, size and entropy estimate.

Generate random strings with a custom alphabet, length and entropy calculation.

Generate names, emails, addresses, UUIDs and JSON records entirely in your browser.

Generate URL, text and Wi-Fi QR codes locally.

Build a Unix cron expression visually and preview the next 10 run times.

Choose origins, methods and headers, then generate Nginx, Express or Cloudflare CORS config.

Search HTTP status codes with practical API examples.

Calculate subnet, usable range, network and broadcast for IPv4 and IPv6.

Paste an OpenAPI JSON or YAML spec and inspect endpoints locally.

Convert a cURL command into fetch, Axios, Node.js or Python.