Free online converters & developer utilities
ConvertUtility is a collection of fast, privacy-friendly tools - from data converters (JSON/CSV) to everyday utilities. We add new tools regularly.
Popular tools
JSON to CSV Converter
Convert JSON to CSV online. Fast, private and free.
CSV to JSON Converter
Convert CSV to JSON online. Fast, private and free.
JSON Formatter & Validator
Format, prettify and validate JSON online. Fast, private and free.
Base64 Encode / Decode
Encode text to Base64 or decode Base64 to text. Fast, private and free.
URL Encode / Decode
Encode and decode URL components online. Fast, private and free.
JWT Decoder
Decode JWT header and payload online. Fast, private and free.
Why ConvertUtility
- Fast tools optimized for everyday use.
- Privacy-first: many tools run locally in your browser when possible.
- Clean UI with copy/download helpers.
- New converters and utilities added over time.