Developer Tools
Everyday developer utilities that run 100% in the browser. No data is uploaded, which makes them safe for tokens, keys and config files.
Tools in this collection
- JSON Formatter & Validator — Free JSON Beautifier Format, validate, and beautify JSON data instantly with syntax highlighting and error detection. 100% browser-based and completely free.
- JSON to CSV Converter — Free Online JSON Converter Convert a JSON array of objects into CSV in your browser. Auto-detect every column, escape values per RFC 4180, then copy or download the result.
- CSV to JSON Converter — Free Online Tool Convert CSV to JSON in your browser. Auto-detect the delimiter, handle quoted fields and newlines per RFC 4180, then copy or download the JSON array.
- Base64 Encoder & Decoder — Online Converter Encode or decode Base64 strings instantly in your browser. 100% client-side processing, no uploads, and completely free.
- JWT Decoder — Read Header & Payload Online Decode any JSON Web Token in your browser: read the header, payload and claims, and see exp, iat and nbf as human dates. Private, no upload, no signature check.
- HTML Encoder & Decoder — Free Online Tool Encode text to HTML entities and decode entities back to text in your browser. Escape &, <, >, quotes and apostrophes, or convert non-ASCII characters.
- URL Encoder & Decoder — Free Percent-Encoding Tool Encode and decode URLs and query strings instantly with encodeURIComponent or encodeURI. Detects malformed percent-encoding. Free and private.
- Hash Generator — MD5, SHA-1, SHA-256 & SHA-512 Generate MD5, SHA-1, SHA-256 and SHA-512 hashes from any text instantly with copy buttons. Free, private and 100% online in your browser.
- UUID Generator — Generate Random UUID v4 Online Generate random UUID v4 values instantly, one or many at a time, with an optional uppercase format. Free, private, and fully browser-based.
- Random String Generator — Secure Alphanumeric Generate random strings with custom length and character sets — alphanumeric, hex, lowercase or custom. Cryptographically secure and free.
- Password Generator — Strong Random Passwords Generate secure random passwords with customizable length and character options. Free, private, and always 100% browser-based.