- 100% in-browser
- No sign-up
- Free
Developer tools that run in your browser
Format, validate, compare and convert JSON, and encode Base64, without sending your data anywhere.
Tools
Everything you need for JSON and Base64
JSON Formatter & Beautifier
Pretty-print JSON with 2 or 4 spaces or tabs, sort keys, and see errors with line and column.
Open tool →JSON Validator
Know instantly whether your JSON is valid, and where it breaks if it is not.
Open tool →JSON Minifier
Strip whitespace to make JSON smaller for APIs, config and storage.
Open tool →JSON Compare (JSON Diff)
Paste two JSON documents and see every added, removed and changed value by path.
Open tool →JSON to CSV Converter
Turn a JSON array of objects into a CSV you can open in Excel or Google Sheets.
Open tool →Base64 Encode & Decode
Encode or decode Base64 with full UTF-8 and URL-safe support.
Open tool →Base64 Decode
Paste a Base64 string and get the text back, with padding and URL-safe input handled.
Open tool →Why these
Built to be trusted with real data
Private by design
Every tool runs in your browser. What you paste is never uploaded, logged or stored.
Instant
No sign-up, no queue and no server round trip. Results appear as you work.
Errors you can act on
Invalid input points to the exact line and column, and each guide explains the fix.
Guides