Free and in-browser
Tools
Small utilities built while working on something else, kept around because they turned out useful. Everything runs locally in your browser — nothing is uploaded.
Responsive Breakpoint Tester
Paste a page and view it across several device widths at once, so layout breaks show up side by side instead of one resize at a time.
Bundle Size Analyzer
Weigh JavaScript dependencies, spot the packages carrying the most bytes, and sanity-check what shipping them costs.
Code Snippet Generator
Turn a block of code into a clean, syntax-highlighted image for posts, docs, and release notes.
Color Palette Generator
Build palettes with contrast checking, so the result stays readable before it reaches a design file.