Tiny developer utilities.
Fast, free, and private. Everything runs in your browser — no tracking, no server round-trips.
- IP / User-Agent
Your public IP address, location hints, and browser user agent.
- JWT Decoder
Decode JWT header & payload, with human-readable timestamps.
- JSON / JSONC Formatter
Prettify or minify JSON and JSONC (comments, trailing commas).
- Base64 Encode / Decode
UTF-8 safe Base64 and Base64URL encoding and decoding.
- CSV Viewer
View CSV/TSV as a table and copy rows as CSV, TSV, or JSON.