Developer utilities

UtilityKit — Developer Utilities in the Browser

Structured data editor and tree view, markup preview, token decoder, MD5/SHA hashes, Base64 and URL codecs, Unix time converter. Free, private, no install.

In your browserProcessing stays on your device—no server upload.
FreeEvery tool is available without sign-up or subscription.
PrivateJSON, tokens, and secrets never leave the tab.

All tools

JSONEdit, format, and explore structured data as a tree.Editor · Viewer
HTMLMarkup editor with a live page preview.Viewer
JWTDecode tokens and verify HMAC signatures.JWT
EncryptionMD5, SHA-1/256/512, and Base64 for text.MD5 · SHA-1 · SHA-256 · SHA-512 · Base64
URLEncode and decode URLs and query parameters.URL codec
TimeConvert Unix timestamps to dates and back.Unix time