Free, fast, and private. All tools run entirely in your browser — no ads, no accounts, no tracking, no server uploads.
Format, validate, auto-fix and prettify JSON
Generate QR codes — PNG, SVG, JPEG & WebP download
Format, beautify, and minify SQL with dialect presets
Encode and decode Base64 strings
Encode and decode URL components
Decode and inspect JWT tokens
Test REST APIs directly in your browser
Parse, extract, and analyze URL components
Convert between HEX, RGB, and HSL
Create beautiful CSS gradients visually
Live markdown rendering with preview
Favicons from text, emoji or image — PNG & ICO
Grayscale, rotate, crop, resize & compress images
Visual CSS box-shadow generator and editor
Test and debug regular expressions
Compare texts and see differences
Convert text to URL-friendly slugs
Generate placeholder text easily
Convert text between different casing styles
Count words, characters, and sentences
Live character count and text density analysis
Generate random UUID v4 identifiers
Unix timestamp and date conversion
SHA-256 / SHA-512 text hashing
Generate secure, random passwords
Parse and translate Cron schedules
Git, Docker, Linux, JavaScript, Python, SQL and more.
Quick reference guide to web status codes (100–599).
Common questions about DeveloperLeap tools and privacy.
Browse all developer utilities in one place.