Online Developer & Utility Tools

Essential tools for developers and power users — generate IDs, inspect tokens, build QR codes, test regex, convert timestamps, and more. All processing is client-side.

These tools cover the day-to-day utilities that developers reach for outside the core encode/decode and JSON workflows. Need a fresh UUID for a database migration? Decoding a JWT to inspect its claims? Converting an epoch timestamp to a readable date? Building a QR code for a URL? They're all here — no sign-up, no data sent to a server.

All Developer & Utility Tools

Generate RFC 4122 v4 UUIDs in bulk. Copy individually or all at once.

Timestamp Converter

Convert Unix epoch timestamps to human-readable dates and back. Supports seconds and milliseconds.

Decode and inspect JWT header, payload, and signature without a secret key.

QR Code Generator

Generate QR codes for URLs, text, or contact info. Download as PNG.

Test and debug regular expressions with real-time match highlighting and group capture display.

Pick or enter a color and get its HEX, RGB, HSL, and HSV values instantly.

Parse cron expressions into human-readable schedules and preview the next run times.

Number Base Converter

Convert numbers between binary, octal, decimal, and hexadecimal in real time.

Password Generator

Generate strong, random passwords with configurable length and character sets.

HTTP Status Codes

Searchable reference for all HTTP status codes with descriptions and use cases.

Semi-Prime Factorizer

Factor semi-prime integers using Pollard’s rho and ECM algorithms, with step-by-step output.

Beautify SQL queries with proper indentation. Supports MySQL, PostgreSQL, T-SQL, BigQuery and more.

IP Address Lookup

Find your public IP address and look up geolocation, ISP, and timezone for any IP.

CSS Gradient Builder

Build linear, radial, and conic gradients visually with color stops and angle control. Copy ready-to-use CSS.

Color Palette Generator

Generate harmonious palettes — complementary, triadic, analogous, and more. Export as CSS variables.

Query A, AAAA, MX, TXT, CNAME, NS, SOA, and CAA records for any domain via Cloudflare DoH.

Look up domain registration details: registrar, status, creation/expiry dates, nameservers, and DNSSEC via RDAP.

CSS Box Shadow Builder

Build multi-layer box shadows interactively. Adjust offset, blur, spread, color, and inset. Copy CSS instantly.

Responsive Preview

Preview any URL at common device breakpoints — mobile, tablet, laptop, desktop — in sandboxed iframes.

Break any URL into its components — protocol, host, path, query params, and fragment — or build a URL from scratch.

CIDR Calculator

Calculate IPv4 subnet details: network address, broadcast, host range, and usable hosts from any CIDR notation.

CSS Flexbox Playground

Visually configure flexbox properties — direction, wrap, justify, align — and copy ready-to-use CSS instantly.