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
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
Need to decode a binary string into readable text? Or convert text to binary? BinTranslate supports five conversion modes: binary to text, text to binary, binary to English, binary to ASCII, and words to binary. Everything runs client-side — no data ever hits a server.
3. Epoch Converter — Timestamp Tool
https://www.epochconverter.com/
The classic. Convert Unix timestamps to human-readable dates and back. Supports milliseconds, microseconds, and nanoseconds.
4. JWT.io — JWT Debugger
Decode, verify, and debug JSON Web Tokens right in the browser. Supports HS256, RS256, ES256, and more. Great for debugging auth flows.
5. RegExr — Regex Playground
Learn, build, and test regular expressions with a cheatsheet, reference, and real-time highlighting.
All of these are free, no sign-up, and run in the browser. Got any tools you keep coming back to? Drop them in the comments.
P.S. I built BitwiseCalc and BinTranslate myself — feedback welcome.