Free Developer tools
Everyday utilities for developers and DevOps engineers. Test, format, encode and generate without pasting your code or data into someone else’s server.
- Regex TesterTest regular expressions with live match highlighting, capture groups, flags and a quick-reference cheat sheet.
- Cron Expression BuilderBuild cron expressions with dropdowns, read them in plain English and preview the next run times.
- Chmod CalculatorSet Unix file permissions with checkboxes and get the octal value, symbolic notation and chmod command.
- CIDR CalculatorCalculate network address, broadcast, host range, subnet mask and host count from CIDR notation, with binary view.
- UUID GeneratorGenerate random v4 or timestamp-based v1 UUIDs, one at a time or up to 100 in bulk, and validate existing UUIDs.
- Number Base ConverterConvert numbers between binary, octal, decimal and hexadecimal in real time.
- URL Encoder & DecoderEncode text for safe use in URLs or decode percent-encoded strings, with component and full-URL modes.
- HTML Entity EncoderEncode special characters to HTML entities or decode entities back to text, with named, decimal or hex formats and a reference table.
- SQL FormatterFormat and beautify SQL queries for MySQL, PostgreSQL, SQL Server, SQLite, Oracle, BigQuery and more, or minify them.
- HTML FormatterBeautify messy or minified HTML with clean indentation, or minify it, in a code editor with syntax highlighting.
- Diff CheckerCompare two texts or code files and highlight added, removed and changed lines in split or unified view.
- URL ParserBreak a URL into protocol, host, port, path, query parameters and fragment, with decoded values in a table.
- User Agent ParserParse a user agent string to see the browser, version, engine, operating system and device type, or check your own.
- Meta Tag GeneratorGenerate HTML meta tags for SEO, Open Graph and Twitter Cards, with live Google and social previews.
- .gitignore GeneratorSelect your languages, frameworks and tools to generate a clean .gitignore file instantly, with presets for frontend, backend and mobile.
- Env Variable ParserConvert between .env, JSON and YAML with automatic format detection and secret detection.
- HTTP Status CodesSearch every HTTP status code from 1xx to 5xx with plain-English meanings and when to use each.
- LLM Token CounterEstimate how many tokens your prompt uses in GPT, Claude, Gemini, Llama and other models, with character, word and sentence counts.
- Markdown PreviewWrite Markdown and see rendered HTML live, with tables, code blocks and task lists.
- Create ZIP FileBundle several files into one ZIP archive right in your browser, then download it.