Free Online Developer Tools

Format, beautify, and validate JSON with customizable indentation.

Write Markdown and see a live HTML preview side by side.

Encode text to Base64 or decode Base64 strings back to plain text.

Encode special characters for URLs or decode URL-encoded strings.

Decode JSON Web Tokens to inspect header, payload, and expiration.

Encode special characters to HTML entities or decode them back.

Convert between JSON and YAML formats instantly.

Convert between Unix timestamps, ISO 8601, and human-readable dates.

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

Convert colors between HEX, RGB, and HSL formats with live preview.

Convert text between camelCase, snake_case, PascalCase, kebab-case, and more.

Generate UUID v4 (random) and v1 (time-based) identifiers.

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text.

Generate placeholder text in paragraphs, sentences, or words.

Test regular expressions with live matching, highlighting, and capture groups.

Compare two texts and visualize the differences in unified or split view.