Interactive sandboxes for hash, AES encryption, HMAC, JWT, regex, dates, TOTP, Markdown, and cron. Try everything in the browser — nothing to install.
Client-side playgrounds to explore cryptography, JWT, regular expressions, date formatting, and more — everything runs locally in your browser.
Compute SHA-256, SHA-512, and MD5 hashes of any text online. Free developer tool — processing runs in your browser.
Sign and verify messages with HMAC-SHA256 or HMAC-SHA512. Online playground to test payload integrity and authentication.
Encrypt and decrypt text with AES-GCM or AES-CBC via the Web Crypto API. Keys and IV in hex or Base64 — runs in the browser.
Encrypt and decrypt text with a password via Envelopa (Argon2id + AES-256-GCM) — runs locally in the browser.
Generate two-factor TOTP codes from a Base32 secret or otpauth:// URI. Compatible with Google Authenticator and similar apps.
Encode, decode, inspect, and verify JWT tokens in the browser. Generate HMAC tokens, view header and payload, time claims, and validate signatures.
Test regular expressions with live match and group highlighting. Flags, replace mode, and ready-made examples included.
Format and parse date strings with custom date-fns patterns. Live examples and tokens like yyyy, MM, and dd.
Test cron expressions and see upcoming runs with timezone support. Coming soon in the browser.
Paste Markdown and preview rendered HTML in real time with syntax highlighting, GFM tables, and side-by-side view.
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