You only have to create an account if you want to upgrade to DevToolbox Pro which saves your history so you can keep track of all the actions you have done.
Diff Viewer
JSON Validator
String Converter
Character/Word Counter
Unix Time Converter
Base64 Encoder
Base64 Image Encoder
Url Parser
Color Converter
Hash Generator
Line Sort And Dedupe
Regex Checker
Markdown Editor
QRCode Generator
ASCII Converter
RGB:
RGBA:
Hex: