URL Encode
URL Decode
HTML Entities Encode
HTML Entities Decode
Base64 Encode
Base64 Decode
SHA1
MD5
SHA256
SHA512
JSON Formatter
Build Form From Parameters
Paste in form encoded parameters (only escapes ')

Helper Links:

Online Diff
RequestBin
DNS Bin
"window.opener" Test Script
External XSS JS
XSS Playground
SAML Assertion Decoder/Encoder