Free Online Developer Tools

Format, validate, and beautify JSON data with syntax highlighting.

Encode text to Base64 or decode Base64 strings instantly.

Generate random UUIDs (v4) with one click. Bulk generation supported.

Generate placeholder text in paragraphs, sentences, or words.

Count words, characters, sentences, and paragraphs in any text.

Encode or decode URLs and query strings. Handles special characters.

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

Generate strong, random passwords with customizable length and characters.

Pick colors and convert between HEX, RGB, and HSL formats.

Write Markdown and preview the rendered HTML output in real time.

Minify or beautify CSS code. Remove whitespace or format for readability.

Compare two texts and highlight the differences line by line.

Convert Unix timestamps to human-readable dates and vice versa.

Convert JSON arrays to CSV format and CSV back to JSON.

Convert any text into a URL-friendly slug. Clean, lowercase, hyphenated.

Test regular expressions against text with real-time highlighting of matches.

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

Encode special characters to HTML entities or decode them back to text.

Build and understand cron expressions with a visual, interactive editor.

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

Convert text between uppercase, lowercase, camelCase, snake_case, and more.

Calculate Unix file permissions in octal and symbolic notation.

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

Escape or unescape special characters like newlines, tabs, and quotes.

Analyze IPv4/IPv6 addresses: class, scope, binary, and hex representation.

Sort lines alphabetically, numerically, or by length. Remove duplicates.

Extract all paths from a JSON object. Filter and copy JSONPath expressions.

Calculate aspect ratios and resize dimensions proportionally.

Format and beautify SQL queries with proper indentation and keywords.

Generate lightweight SVG placeholder images with custom dimensions and colors.

Convert between YAML and JSON formats instantly.

Inspect characters: code points, HTML entities, CSS escapes, UTF-8 bytes.

Convert between HEX, RGB, and HSL color values.

Minify JavaScript code by removing comments and whitespace.

Repeat any text multiple times with custom separators.

Convert HTML to Markdown format. Handles headings, lists, links, and more.

Count bytes, characters, and code points. Shows UTF-8 and UTF-16 sizes.

Generate random numbers within a custom range with various options.

Translate text to Morse code and Morse code back to text.

Encode/decode text with ROT13, ROT47, or custom Caesar cipher shift.

Create CSS linear and radial gradients with a visual editor and presets.

Generate TypeScript interfaces from JSON data automatically.

Convert text to binary, hexadecimal, octal, or decimal representation.

Create Markdown tables with a visual editor and column alignment.

Convert between formatted and stringified (escaped) JSON.

Create box shadows with a visual editor. Adjust offset, blur, spread, and color.

Convert between px, rem, em, pt, vw, vh, and percent CSS units.

Generate Open Graph and Twitter Card meta tags for social media previews.

Parse URLs into protocol, hostname, port, path, query params, and hash.

Generate SVG favicons with emoji, text, or initials. No upload needed.