Tool collection
Developer tools
Focused utilities with clear availability and privacy labels.
JSON Tools
Format JSON, decode escaped JSON strings, or convert JSON to and from YAML and CSV locally.
Open tool On-deviceBase64 Text Encoder
Encode and decode UTF-8 text as Base64 locally.
Open tool On-deviceURL Encoder & Decoder
Safely encode or decode URL components in your browser.
Open tool On-deviceUnix Timestamp Converter
Automatically convert Unix seconds, milliseconds, microseconds, nanoseconds, and ISO date-times locally.
Open tool On-deviceJWT Encoder & Decoder
Decode JWT contents, inspect time claims, or sign HS256 tokens locally.
Open tool On-deviceUUID Generator
Generate cryptographically random UUID v4 identifiers.
Open tool On-deviceHash Generator
Generate or verify SHA-256, SHA-384, and SHA-512 hashes locally.
Open tool On-deviceMarkdown Preview
Preview sanitized Markdown live and export standalone HTML.
Open tool On-deviceRegex Tester
Inspect matches, capture groups, and replacement output.
Open tool On-deviceText Diff Checker
Compare two texts with highlighted line additions and removals.
Open tool On-deviceSQL Formatter
Format common SQL dialects locally without executing queries.
Open tool On-deviceHTML, CSS & JavaScript Formatter
Format HTML, CSS, and JavaScript locally with Prettier.
Open tool On-deviceCron Expression Helper
Construct and explain standard five-field cron expressions.
Open tool On-deviceRandom Number Generator
Generate unbiased random numbers with Web Crypto.
Open tool On-devicePassword Strength Estimator
Estimate password entropy locally without transmitting the password.
Open tool On-deviceSecure Password & Passphrase Generator
Generate secure passwords or memorable local passphrases.
Open tool On-deviceHMAC Generator
Generate SHA-2 HMAC signatures locally with Web Crypto.
Open tool On-deviceAES Text Encryption & Decryption
Encrypt or decrypt text locally using password-derived AES-256-GCM.
Open tool On-deviceCertificate & PEM Viewer
Inspect PEM block type, decoded size, and fingerprint locally.
Open tool On-deviceTOTP Generator
Generate standard six-digit TOTP codes from a Base32 secret locally.
Open tool