Developer Tools
Format, convert, and validate data formats — entirely in your browser, nothing uploaded.
JSON Formatter & Validator
Format, beautify, validate, and minify JSON online. Pinpoints syntax errors with line and column numbers — entirely in your browser, nothing uploaded.
Open tool →JSON to CSV Converter
Convert JSON to CSV or CSV to JSON in your browser. Flattens nested objects, handles quoted fields, and downloads the result — no uploads, no signup.
Open tool →Base64 Encode & Decode
Encode text or files to Base64 and decode Base64 back to text in your browser. Full UTF-8 support, URL-safe mode, and instant copy — no uploads, no signup.
Open tool →JWT Decoder
Decode a JWT to read its header and payload claims instantly in your browser. Shows expiry and issued-at as readable dates — nothing is uploaded, no secret needed.
Open tool →URL Encoder & Decoder
URL-encode or decode text and query strings in your browser. Switch between component and full-URL encoding, with a live query-string breakdown. No uploads, no signup.
Open tool →Free developer tools that run in your browser
A set of everyday developer utilities that run 100% client-side. Because nothing is uploaded, these are safe to use with sensitive data — API responses, tokens, and config you would not want to paste into a random website.
Format and validate JSON, convert JSON to CSV, encode or decode Base64, decode a JWT, or URL-encode a string. Each tool is fast, focused, and works offline once loaded.
Frequently asked questions
Are these developer tools free?
Yes — every tool is free, with no signup and no usage limits.
Is my data or code uploaded to a server?
No. All parsing and conversion happens locally in your browser with no network requests, so tokens, payloads, and config never leave your device — the reason these are safe for sensitive data.
Do the developer tools work offline?
Once a tool page has loaded, the work happens on your device, so it keeps working without a connection.