About DevDrawer

Small, fast developer tools that run in your browser.

What this site is

DevDrawer is a small collection of free tools that each do one job well. There is no account, no sign-up and no paywall.

How the tools work

Every tool runs entirely in your web browser. What you type or paste is processed on your own device and is not uploaded to us or anyone else. Some tools remember your last settings or work in your browser's local storage so they are still there next time; you can clear that at any time in your browser settings.

The tools

• CSS Minifier: Minify CSS safely: strip comments and whitespace, keep strings and calc() intact.
• HTML Minifier: Shrink HTML by removing comments and extra whitespace without breaking <pre> or scripts.
• YAML to Swagger Converter: Convert an OpenAPI / Swagger YAML file to swagger.json and preview its endpoints.
• Online JavaScript Compiler: Write and run JavaScript in your browser with a console, error output and a safety timeout.
• Online HTML Editor: Edit HTML, CSS and JavaScript with an instant live preview in your browser.
• Regex Builder & Tester: Build regular expressions from blocks, then test them with live match highlighting.
• Unix Timestamp Converter: Convert Unix epoch timestamps to dates and back, with auto-detected units.
• JWT Encoder & Decoder: Create and sign HS256/HS384/HS512 JSON Web Tokens, or decode and verify one.
• Binary to Hex Converter: Convert binary numbers of any length to hexadecimal and decimal.
• Hex to Binary Converter: Convert hexadecimal to binary (and decimal), with nibble grouping.
• Mock Data Generator: Generate realistic fake rows as JSON, CSV or SQL inserts for testing and prototypes.

Contact

Found a bug, a wrong result or have an idea for a tool? Email kronoswebdesigns@gmail.com.