Echo Lab

A collection of minimal developer utilities.

JSON Formatter

Paste JSON and get it pretty-printed with syntax highlighting. Runs entirely in the browser — nothing is sent to any server.

client-side

Base64 Encoder / Decoder

Encode or decode Base64 strings instantly. Supports UTF-8 text and binary data.

client-side

UUID Generator

Generate v4 UUIDs with one click. Bulk generation available for batch use cases.

client-side

Hash Calculator

Compute MD5, SHA-1, SHA-256, and SHA-512 hashes of any text input.

client-side