9 tools

Developer Tools

Format, convert, and validate JSON, CSV, Base64, JWT, and more — developer tools that run 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. 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. CSV to JSON Converter Convert CSV to JSON in your browser — auto-detects the delimiter, handles quoted fields, and keeps numbers and booleans intact. No uploads, no signup. 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. 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. 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. UUID Generator Generate random UUID v4 values (GUIDs) instantly in your browser. Create one or generate hundreds in bulk, with hyphen, case, and brace formatting. No uploads, no signup. Hash Generator Generate SHA-256, SHA-1, SHA-384, or SHA-512 hashes from text or files in your browser — private, instant, and nothing is ever uploaded. Unix Timestamp Converter Convert Unix timestamps to readable dates and back — seconds or milliseconds, ISO 8601, UTC and local time, instantly in your browser.

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.