Free Online Developer Tools
14 essential utilities built for developers — all running locally in your browser with zero setup and no data uploads.
Free online developer tools eliminate hours of repetitive work. Whether you need to format and validate JSON before sending it to an API, encode binary data as Base64 for safe HTTP transmission, or decode a JWT token to inspect its claims without a local environment, every common dev workflow is covered.
Each tool runs entirely in your browser using client-side JavaScript. Your code, tokens, and sensitive credentials never leave your device — making them safe to use with production data and API secrets.
The collection includes a JSON Formatter with syntax highlighting and validation, a Base64 Encoder/Decoder for text and files, a URL Encoder/Decoder for percent-encoding, a UUID Generator with v4 and v7 support, a JWT Decoder for inspecting token headers and payloads, and a Regex Tester with live match highlighting and group capture display.
For code optimization, the HTML Minifier, CSS Minifier, and JavaScript Minifier strip whitespace and comments from your production assets. For data format conversion, the JSON-to-CSV Converter, XML-to-JSON Converter, YAML-to-JSON Converter, and CSV Viewer handle every modern data interchange format. The Base64 Image Encoder/Decoder completes the set by generating data URIs for embedding images directly in HTML and CSS.