Developer Tools
Browse 17 free online developer tools. All tools run instantly in your browser - no download or sign-up required.
Format and validate your JSON data instantly. Our free tool checks syntax, beautifies with proper indentation, and can minify JSON for production use.
Test your regular expressions in real-time. See matches highlighted, view capture groups, and debug your regex patterns with instant feedback.
Decode any JWT to view its header, payload claims, and signature. Inspect expiration times, issuers, and custom claims for debugging authentication flows.
Minify your CSS and JavaScript code to reduce file size. Remove unnecessary whitespace, comments, and optimize for faster page loads in production.
Format your SQL queries with proper indentation and line breaks. Support for multiple SQL dialects with customizable formatting preferences.
Generate cryptographic hashes from text or files. Support for MD5, SHA1, SHA256, SHA384, SHA512, and other algorithms. Compare hashes for integrity verificat...
Calculate multiple hash types at once from your input. See MD5, SHA1, SHA256, SHA512, and other hashes side-by-side for quick comparison and verification.
Encode text to Base64 or decode Base64 strings back to plain text. Support for standard and URL-safe Base64 encoding with proper UTF-8 handling.
Encode special characters for safe URL usage or decode percent-encoded strings. Essential for handling query parameters, API calls, and web development.
Encode special characters to HTML entities or decode named, decimal, and hex entities back to readable text — free and fully in your browser.
Convert between Unix timestamps and human-readable dates. Support for seconds and milliseconds, multiple timezones, and various output formats.
Validate your cron expressions and see when they'll run next. Get human-readable explanations of cron syntax and preview upcoming execution times.
Convert between CSV and JSON formats effortlessly. Upload files or paste data, customize column mapping, and export in your preferred format.
Generate QR codes for any content including URLs, text, WiFi networks, and vCards. Customize colors, add logos, and download in high-resolution formats.
Convert YAML to JSON and JSON to YAML instantly in your browser. Free bidirectional converter with validation, error messages and copy-to-clipboard.
Generate realistic random user-agent strings for Chrome, Firefox, Safari and Edge across Windows, macOS, Linux, Android and iOS. Free, in bulk.
Generate Open Graph and Twitter Card meta tags with a live share-preview. Type your title, description, URL and image, copy the ready-made <head> tags.
How this tool works: This tool runs in your browser and on our server in real time. Depending on the tool, results are computed directly from the input you provide or retrieved from live, authoritative data sources at the moment you run a lookup. We do not sell your data, and your lookups are kept private — any history shown here is stored only on your device.