As a developer, I find myself doing the same conversions and lookups over and over. Here are 5 free, no-signup tools that live in my bookmarks:

1. BitwiseCalc — Bitwise Operations Calculator

https://bitwisecalc.com

When you're debugging bit flags, network masks, or color channels, mental math gets old fast. BitwiseCalc handles AND, OR, XOR, NOT, left and right shifts on binary, decimal, and hex numbers. It supports 32-bit and 64-bit precision and keeps a calculation history so you don't lose track of your operations.

2. BinTranslate — Binary ↔ Text Converter