🛠️ Developer Tools
The conversions developers actually reach for — bases, colors, timestamps, encodings, subnets, and display math. No sign-up, no telemetry: every tool computes locally in your browser.
Encoding & Conversion Tools
Number Base Converter
Decimal, binary, hex, and octal — handles arbitrarily large numbers via BigInt.
🌈Color Converter
HEX ↔ RGB ↔ HSL with a live swatch and copy-ready CSS values.
📟Unix Timestamp Converter
Epoch seconds or milliseconds to human dates and back, with the live current timestamp.
🔣Base64 Encode / Decode
UTF-8-safe encoding and decoding, including the URL-safe variant JWTs use.
🌐Subnet Calculator
Network, broadcast, usable host range, and masks for any IPv4 CIDR prefix.
🔍PPI Calculator
Pixel density and dot pitch from resolution and screen size, with monitor presets.
AaPX to REM Converter
px, rem, em, pt, and percent at any root font size — with a cheat sheet.
🖼️Aspect Ratio Calculator
Find any resolution's ratio or solve the missing width or height.
⬇️Download Time Calculator
Transfer time for any file size at any connection speed.