Developer Tools

Base64 Encoder / Decoder

Free online Base64 encoder and decoder. Convert plain text, URLs, or any string to Base64 and back instantly. Supports standard and URL-safe Base64. Runs entirely in your browser.

JSON Formatter & Validator

Free online JSON formatter, validator and minifier. Paste your JSON to instantly validate it, pretty-print with indentation, or minify it to a single line. Runs entirely in your browser.

Mock Data Generator

Free online mock data generator. Build custom datasets with realistic fake names, emails, phone numbers, addresses, dates, colors, UUIDs, and more. Export as JSON, CSV, or SQL. Runs entirely in your browser.

Unix Timestamp Converter

Convert Unix timestamps (epoch time) to human-readable dates and times, and convert dates back to Unix timestamps. Supports seconds and milliseconds. Free, runs in your browser.

URL Encoder / Decoder

Free online URL encoder and decoder. Percent-encode special characters in a URL or query string, or decode an encoded URL back to plain text. Runs entirely in your browser.

Free Online Developer Tools

A growing collection of browser-based tools built for developers, designers, and anyone who works with data and code. Every tool runs entirely client-side — nothing is sent to a server.