Free Developer Tools

Fast. Private. No frameworks. No tracking. Everything runs in your browser.

JSON Formatter & Validator

Format, validate, minify, and sort JSON keys. Instant, client-side.

Base64 Encode / Decode

Encode text to Base64 or decode Base64 back. URL-safe variant included.

Regex Tester

Test regular expressions with real-time matching and capture group highlighting.

JWT Decoder

Decode JSON Web Tokens — view header, payload, claims, and expiration status.

URL Encoder / Decoder

Encode/decode URLs and parse URL components. encodeURIComponent & encodeURI.

Color Converter

Convert between HEX, RGB, and HSL with live preview and color picker.

Cron Expression Builder

Build cron expressions visually with human-readable descriptions and next run times.

Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-512 hashes. Supports file hashing.

Markdown Previewer

Write Markdown, see live preview. Supports GFM, tables, and code blocks.

Lorem Ipsum Generator

Generate placeholder text — paragraphs, sentences, or words. Instant.

Gaussian Elimination Visualizer

Step-by-step animated walkthrough of forward elimination and back substitution. Watch every row operation unfold.

Zero frameworks. Zero tracking. Zero server calls. Every tool runs 100% client-side in your browser.
Built by Rio Gesulgon — Senior Fullstack Engineer, framework-free enthusiast.