Developer Tools, Zero Friction
A growing collection of micro-utilities built for developers. No login, no tracking, no server — everything runs right in your browser.
Available Now
Start Using Live Tools
These tools are fully functional today.
JSON Formatter
Pretty-print, minify, and validate JSON instantly.
Base64 Encoder / Decoder
Encode text or files to Base64 and back.
URL Encoder / Decoder
Encode or decode URL query parameters in one click.
JWT Decoder
Inspect JWT header, payload, and expiry without a secret.
Regex Tester
Live regex matching with capture groups highlighted.
Diff Viewer
Paste two text blocks and see line-by-line differences.
HTML Entity Encoder/Decoder
Encode or decode HTML entities safely.
Cron Job Parser
Parse cron schedules into plain English instantly.
Color Converter
Convert HEX ↔ RGB ↔ HSL ↔ OKLCH with live preview.
Why DevZen?
Built the Right Way
No bloat. No tracking. Just tools that work.
100% Private
Everything runs in your browser. No data is ever sent to a server.
Instant Results
No loading spinners, no round trips. Results appear as you type.
No Login Required
Open any tool and start using it immediately. No accounts, no forms.
Works Everywhere
Responsive design that works on desktop, tablet, and mobile.
SEO-Friendly URLs
Bookmark any tool — each has its own clean, shareable URL.
Always Free
Core tools will always be free. No paywalls, no subscriptions.