Free Online Developer Tools

Format, validate and beautify JSON data — free developer tool.

Encode text to Base64 or decode Base64 to text — instant and private.

Encode or decode URLs and query strings — instant and private.

Generate strong, random passwords — secure and private.

Generate SHA-1, SHA-256, SHA-384, SHA-512 hashes from text — instantly.

Write Markdown and see a live preview side-by-side — free and instant.

Convert JSON arrays to CSV format — instant and free.

Test regular expressions with live highlighting and match details.

Minify or beautify CSS code — reduce file size or improve readability.

Convert numbers between binary, octal, decimal, and hexadecimal.

Generate SEO meta tags, Open Graph, and Twitter card tags.

Generate TypeScript interfaces from JSON objects instantly.

Convert images to Base64 data URIs for embedding in code.

Minify or beautify HTML code — strip comments and whitespace.

Convert text to binary code and binary to text.

Generate clean URL slugs from titles and text.

Convert between px, rem, em, pt, %, vw, and vh.