A collection of lightweight, client‑side utilities for everyday coding tasks. No data leaves your browser.
Encode or decode URL‑encoded strings. Supports UTF‑8 and percent‑encoding.
Convert text or binary files to/from Base64. Download decoded binary directly.
Pretty‑print, minify, and validate JSON. Copy formatted JSON with one click.
Write Markdown on the left, see rendered HTML on the right. GitHub‑flavored Markdown support.
Create version 1, 4 or 5 UUIDs. Uppercase/lowercase, with or without hyphens or braces.
Generate strong passwords with customizable length, character sets and options.
Create QR codes for any text or URL. Download the generated PNG image.
Generate harmonious color palettes from a base color. Click a swatch to copy its HEX value.
Convert between common units for length, weight, temperature, volume, area and speed.
Convert Unix timestamps (seconds or milliseconds) to human‑readable dates and vice‑versa.
Test regular expressions against sample text, see matches, groups and highlighted preview.
This toolbox is built entirely with HTML, CSS and JavaScript. It provides a set of lightweight, client‑side developer utilities — including a JSON formatter & validator, Base64 encoder/decoder, UUID generator, QR code and color palette generator, unit and timestamp converters, and other handy tools. All operations run locally in your browser; no data is sent to any server. See the sitemap for a full list of pages and localized versions.