12 essential developer tools. Free, no ads, no sign-up. Every tool runs locally in your browser.
Format, validate, and beautify JSON data with syntax highlighting.
Convert Unix timestamps to human-readable dates and vice versa.
Encode text to Base64 or decode Base64 strings back to text.
URL-encode or decode strings for safe web usage.
Test regular expressions with real-time matching and capture groups.
Write Markdown and see the rendered HTML preview in real-time.
Generate random UUIDs (v4) in bulk with one click.
Convert between HEX, RGB, HSL color formats with live preview.
Create QR codes from URLs or text with customizable size.
Visually create CSS linear and radial gradients with code output.
Decode JWT tokens to inspect header, payload, and signature.
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text.