Free Online Developer Tools

JSON Formatter & Validator

Format, validate, and beautify JSON data instantly. Supports minification and syntax highlighting.

SQL Formatter & Beautifier

Format and beautify SQL queries instantly. Supports MySQL, PostgreSQL, SQL Server, and more. Improve readability and consistency.

XML Formatter & Beautifier

Format and beautify XML data instantly. Supports minification, syntax validation, and customizable indentation.

Markdown Formatter & Preview

Format and beautify Markdown with live preview. Standardize headings, lists, spacing, and code blocks. Supports GitHub Flavored Markdown.

Base64 Encoder & Decoder

Encode text to Base64 or decode Base64 to readable text. Supports file uploads and URL-safe encoding.

URL Encoder & Decoder

Encode special characters for URLs or decode URL-encoded strings. Essential for web development and API work.

JWT Decoder & Inspector

Decode and inspect JSON Web Tokens (JWT). View header, payload, and verify token structure instantly.

HTML Encoder & Decoder

Encode special characters to HTML entities or decode HTML entities to text. Essential for web development and preventing XSS.

JavaScript Minifier & Beautifier

Minify JavaScript to reduce file size or beautify minified code for readability. Supports ES6+ syntax.

CSS Minifier & Beautifier

Minify CSS to reduce file size or beautify minified stylesheets. Removes comments, whitespace, and optimizes selectors.

HTML Minifier

Minify HTML to reduce file size. Removes comments, whitespace, and optional tags while preserving functionality.

URL Slug Generator

Convert text to URL-friendly slugs. Generate SEO-friendly URLs from titles, handles special characters and multiple languages.

String Escape & Unescape

Escape and unescape strings for JSON, JavaScript, HTML, URL, and CSV. Handle special characters safely.

JSON to CSV / CSV to JSON Converter

Convert between JSON and CSV formats instantly. Supports nested objects, auto-detects delimiters, and handles headers.

JSON to YAML / YAML to JSON Converter

Convert between JSON and YAML formats instantly. Perfect for config files, API responses, and data transformation.

HTML to Markdown / Markdown to HTML Converter

Convert between HTML and Markdown formats instantly. Perfect for documentation, blog migration, and content conversion.

Password Generator

Generate secure, random passwords for your accounts. Cryptographically secure with customizable options.

UUID Generator

Generate UUIDs v1-v7, Nil, and Max. All versions supported including v7 for databases. Bulk generation and validation.

Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-3, SHA-384, SHA-512, BLAKE2b, and BLAKE2s hashes from text. Useful for checksums and data integrity verification.

Lorem Ipsum Generator

Generate placeholder text for your designs, mockups, and prototypes in paragraphs, sentences, or words.

QR Code Generator

Generate QR codes for URLs, text, and other data. Create scannable codes that work with any smartphone.

Cron Expression Generator & Parser

Generate and parse cron expressions visually. Build cron schedules for Linux, Unix, and cron jobs. See next execution times and human-readable descriptions.

Word Counter

Count words, characters, sentences, and paragraphs instantly. Get reading time and speaking time estimates.

Text Case Converter

Convert text between UPPERCASE, lowercase, Title Case, camelCase, snake_case, kebab-case, and more.

Regex Tester & Debugger

Test and debug regular expressions in real-time. See matches highlighted, capture groups, and detailed explanations.

Text Diff Checker

Compare two texts and see the differences highlighted. Find additions, deletions, and modifications instantly.

Image Compressor to Specific KB

Compress images to exact file size (20KB, 50KB, 100KB). Perfect for passport photos, job applications, and government forms.

Passport Photo Resizer

Create passport and visa photos for any country. Resize to exact dimensions and compress to required file size.

Social Media Image Resizer

Resize images for Instagram, LinkedIn, Twitter, Facebook, YouTube, Pinterest, TikTok, Snapchat, Discord, Twitch, Threads, WhatsApp. Batch processing, custom sizes, background fill.

Color Picker & Converter

Pick colors and convert between HEX, RGB, HSL, and HSV formats. Generate color palettes and copy values instantly.

Unix Timestamp Converter

Convert Unix timestamps to human-readable dates and vice versa. Supports multiple date formats and timezones.

Timezone Converter

Convert time between different timezones instantly. Compare times across cities worldwide with automatic DST handling.

Date Calculator - Days Between Dates

Calculate days between two dates, add or subtract days, weeks, months, or years. Supports business days (excludes weekends).

Time Calculator - Hours Between Times

Calculate hours and minutes between two times, add or subtract hours and minutes. Handles overnight shifts automatically.

Week Number & ISO 8601 Formatter

Get ISO week number, day of year, quarter, and convert dates to ISO 8601 format. Parse and format dates in multiple formats.