Free developer tools that never leave your browser

Encode text to Base64 or decode Base64 instantly in your browser. Free UTF-8 Base64 encoder and decoder with no signup required.

Convert text between uppercase, lowercase, Title Case, camelCase, PascalCase, snake_case, kebab-case, and more instantly online.

Transform CSV files into JSON or convert JSON arrays back to CSV with automatic type detection. Fast, browser-based, and privacy-friendly.

Compare two text files or code snippets with line-by-line and word-by-word highlighting. Quickly identify additions, deletions, and changes.

Compare two JSON objects and quickly identify added, removed, or modified keys with a clear structural difference viewer.

Beautify, validate, and minify JSON with instant syntax error detection and line numbers. Fast, browser-based, and privacy-friendly.

Reduce JSON file size by removing unnecessary whitespace while preserving valid data. Ideal for APIs, storage, and faster data transfer.

Sort text lines alphabetically, remove duplicate entries, and trim whitespace in seconds. Perfect for cleaning lists, logs, and text files.

Generate placeholder text by paragraphs, sentences, or words for web design, UI mockups, prototypes, and publishing projects.

Write and preview Markdown with live HTML rendering in real time. Perfect for README files, documentation, notes, and blog content.

Test and debug regular expressions with live match highlighting, flag support, and instant results. Ideal for JavaScript, Python, and PCRE patterns.

Create clean, SEO-friendly URL slugs from any text with customizable separators, lowercase conversion, and special character removal.

Encode or decode URLs and query strings with instant percent-encoding support. Perfect for web development, APIs, and debugging.

Count words, characters, sentences, paragraphs, reading time, and speaking time instantly. Perfect for writers, students, and content creators.

Beautify, validate, and indent XML with instant syntax error detection. Ideal for editing, debugging, and improving XML readability.

Convert YAML and JSON instantly while preserving data structure and formatting. Great for configuration files, APIs, and development workflows.

Select colors visually and convert between HEX, RGB, HSL, and CSS formats instantly. Copy accurate color values for web and graphic design.

Measure color contrast ratios and verify WCAG AA and AAA accessibility compliance for text, backgrounds, and user interface elements.

Create rounded corners with a visual editor, live preview, per-corner controls, and copy-ready CSS for buttons, cards, and UI elements.

Design linear and radial gradients with multiple color stops, live preview, angle controls, and copy-ready CSS for modern web projects.

Create single or multiple CSS box-shadow effects with a live preview, adjustable blur and spread, and copy-ready CSS for any element.

Create, parse, and validate cron expressions with instant plain-English explanations for scheduling jobs and automated tasks.

Find the exact difference between two dates in years, months, weeks, and days with fast, accurate calculations.

Convert Unix timestamps to readable dates and back with support for seconds, milliseconds, UTC, and local time zones.

Generate a CSS clamp() value for fluid font sizes that scale smoothly between a minimum and maximum viewport width.

Generate cURL commands with custom methods, URLs, headers, query parameters, and request bodies for API testing.

Search HTTP status codes and understand their meanings with clear explanations, categories, and common use cases.

Find MIME types by file extension or look up file extensions for content types used in HTTP and file uploads.

Look up A, AAAA, MX, TXT, NS, CNAME, and other DNS records for any domain with fast, accurate DNS queries.

Generate custom .gitignore files by combining templates for programming languages, frameworks, editors, and operating systems.

Create professional README.md files with sections for installation, usage, features, badges, and licensing in minutes.

Generate a valid robots.txt file with custom user-agent rules, allow and disallow directives, and sitemap support.

Generate a valid sitemap.xml from your URLs with priority, change frequency, and search engine submission support.

Generate SHA-1, SHA-256, SHA-384 and SHA-512 hashes from text instantly, using your browser's built-in Web Crypto API.

Generate strong, secure random passwords with customizable length and character sets using browser-based cryptographic randomness.

Test password strength with entropy analysis, crack time estimates, and security tips, all processed locally in your browser.

Generate RFC 4122 version 4 UUIDs in bulk, free and instantly in your browser. Copy single IDs or export a batch as a list.

Format and beautify HTML code with clean indentation and readable structure directly in your browser.

Compress JPEG and WebP images online with adjustable quality settings and instant file size comparison.

Create downloadable QR codes from text or URLs with custom sizes, colors, and instant browser-based generation.

Optimize SVG files by removing metadata, comments, and unnecessary whitespace to reduce file size and improve performance.

Decode JSON Web Tokens to inspect the header and payload instantly in your browser. See claims like expiry and issuer without a server call.

Generate SEO meta tags, Open Graph tags, and Twitter Cards to improve search visibility and social media previews.

Beautify and indent messy SQL queries for MySQL, PostgreSQL, SQLite, MariaDB and more, instantly in your browser.