Fast, privacy-first utilities for JSON, CSV, strings and cryptography.
Everything runs locally in your browser.
JSON Validator
Validate, prettify, and minify JSON data
JSON Key Counter
Count keys and array elements in JSON
JSON → CSV
Convert JSON arrays to CSV format
CSV -> JSON (Drag & Drop)
Convert CSV files to JSON format
String Length Counter
Count characters, bytes, and lines
Base64 Encode/Decode
Convert strings to/from Base64
HMAC Signature Generator
Generate cryptographic signatures