Tools

SmartZone4U - Crypto & Encoding Tools

Crypto & Encoding Tools

Crypto

RS256 Key Pair Generator

Generate RSA public/private keys for RS256 signing.

One-way MD5 hashing (non-reversible).

Compute SHA-1 digest (hex).

Compute SHA-256 digest (hex).

Compute SHA-512 digest (hex).

Generate an HMAC-SHA256 signature (hex).

PBKDF2 Derive Key

Derive a hex key using PBKDF2.

AES Encrypt (Passphrase)

Encrypt text with AES using a passphrase.

AES Decrypt (Passphrase)

Decrypt AES ciphertext using the same passphrase.

JWT Decode (No Verify)

Decode JWT header and payload without signature validation.

JWT Sign (HS256)

Create an HS256 JWT from header/payload + secret.

JWT Verify (HS256)

Verify an HS256 JWT signature.

Normalize whitespace in PEM blocks.

Compute CRC32 of UTF-8 text (hex).

Encoding

Encode UTF-8 text to Base64.

Decode Base64 to UTF-8 text.

Base64URL Encode

Encode UTF-8 text to Base64URL (JWT-safe).

Base64URL Decode

Decode Base64URL to UTF-8 text.

Base64URL → Base64

Convert Base64URL to padded Base64.

Base64 → Base64URL

Convert Base64 to Base64URL (no padding).

Encode a string using encodeURIComponent.

Decode a URL-encoded string.

URL Query Parser

Parse a query string into JSON (supports repeated keys).

Split a URL into origin, path, query, and hash.

Format JSON with indentation.

Remove whitespace from JSON.

JSON → Query String

Convert a flat JSON object to a URL query string.

Encode UTF-8 text to hex.

Decode hex to UTF-8 text.

Base64 Bytes → Hex

Convert raw Base64 bytes into hex.

Convert ASCII code points into text.

Convert text into ASCII code points.

Convert text to \uXXXX escapes.

Unicode Unescape

Convert \uXXXX escapes back to text.

HTML Entity Encode

Encode text into HTML entities.

HTML Entity Decode

Decode HTML entities back to text.

Timestamp → Date

Convert Unix timestamp to ISO date string.

Date → Timestamp

Convert an ISO date to Unix timestamp.

Convert text between camel/snake/kebab/Pascal and more.

Text Length Counter

Count characters, bytes (UTF-8), and lines.

IDs

Password Generator

Generate a random password using a selectable alphabet.

Generate a single UUID v4.

UUID v4 (Batch)

Generate multiple UUID v4 values.

Generate a single nanoid.

Generate multiple nanoid values.