Developer &amp; Data

Unix Timestamp Converter

Convert Unix seconds, milliseconds, or ISO-style dates into explicit UTC and local values.

IP Address Calculator

Calculate IPv4 or IPv6 CIDR ranges with explicit address and host facts.

Base64 Decoder

Decode strict standard Base64 to valid UTF-8 text locally.

Base64 Encoder

Encode UTF-8 text as standard Base64 using browser APIs.

Cron Expression Builder

Validate five cron fields and build a transparent expression with its plain-language schedule.

CSS Formatter

Parse and format CSS locally with clear syntax errors.

cURL to Code

Convert one bounded cURL request to JavaScript, Python, or PHP while redacting credentials.

DNS Record Lookup Helper

Build validated dig, nslookup, and DNS-over-HTTPS references without making a DNS request.

Hash Generator

Create SHA-256, SHA-384, or SHA-512 text fingerprints with Web Crypto.

HMAC Generator

Create keyed SHA-2 message authentication codes locally with Web Crypto.

HTML Entity Decoder

Decode named and numeric HTML entities to readable text locally.

HTML Entity Encoder

Encode HTML-sensitive characters with optional non-ASCII entity conversion.