Free Online Developer Tools
Free developer tools to minify CSS, JavaScript, and HTML, format and validate JSON, explore JSON and XML as a tree, encode or decode Base64, preview Base64 as PDFs or images, and generate random Base64 strings and JWT secret keys, all client-side.
CSS Minifier
Compress and minify CSS stylesheets instantly to reduce file weight, bandwidth, and page load times.
JS Minifier
Minify JavaScript in the browser by stripping comments, whitespace, and unneeded spaces around operators.
HTML Minifier
Minify HTML markup by removing whitespace, comments, and redundant line breaks without altering structure.
JSON Formatter & Validator
Format, beautify, validate, and minify JSON payloads with instant syntax error messages.
JSON & XML Viewer
View JSON and XML as an interactive collapsible tree with search, syntax highlighting, and one-click JSONPath and XPath copying.
Base64 Encode & Decode
Encode text and files to Base64 format and decode Base64 strings back to clean UTF-8 text or file assets.
Base64 to PDF & Image Viewer
Decode a Base64 string or data URI and instantly preview it as a PDF or image (PNG, JPEG, GIF, WebP, SVG, and more), then download the file.
Random Base64 String Generator
Generate cryptographically secure random Base64 strings online with custom byte counts, URL-safe variants, and optional padding removal.
JWT Secret Key Generator
Generate cryptographically secure JWT secret keys for HS256, HS384, and HS512 signing in Base64, Base64URL, or Hex, ready to paste into your .env file.