Local tools process on your device; network lookups make requests. Saving/sharing is optional, requires an account, and sends selected content to our service.
Test regular expressions with real-time match highlighting, capture groups, and flag options.
Compare two text blocks side-by-side with highlighted additions, deletions, and changes.
Minify JavaScript, CSS, and HTML to reduce file sizes and improve page load performance.
Beautify and format SQL queries with proper indentation for MySQL, PostgreSQL, and more.
Write Markdown with a live side-by-side HTML preview supporting GFM and syntax highlighting.
Build, validate, and describe cron expressions visually for scheduling tasks and jobs.
Convert numbers between binary, octal, decimal, and hexadecimal instantly.
Advanced diff viewer with unified and split views for comparing code and configuration files.
Local tools process on your device; network lookups make requests. Saving/sharing is optional, requires an account, and sends selected content to our service.
Use any tool instantly in your browser. No installation, no IDE plugins, no login.
Built to the standards developers expect: accurate results, edge case handling, and clear UX.
Designed with developer workflows in mind: keyboard shortcuts and clean interfaces.
The regex tester uses JavaScript's built-in RegExp engine, supporting all standard JS regex syntax including lookaheads, lookabehinds, named groups, and all standard flags (g, i, m, s, u, y).
File limits vary by tool. Bulk JSON, YAML, CSV, and SVG paths allow 50MB per file; several single uploads accept 100MB. Input and output must fit in browser memory. Check the specific control rather than assuming a sitewide limit.
The SQL formatter supports MySQL, PostgreSQL, SQLite, SQL Server (T-SQL), and Oracle PL/SQL with dialect-specific keyword formatting.
We support GitHub Flavored Markdown (GFM) including tables, task lists, strikethrough, and fenced code blocks with syntax highlighting.