Web Tools

Web tools for the small front-end work that interrupts a build: validating and formatting HTML, CSS, and JSON on the way into a CMS, converting pixel values to relative units for a responsive layout, and the structural checks that catch silly mistakes (missing alt text, deprecated tags, mismatched braces in stylesheet rules). The category is intentionally browser-only; nothing here requires installing a local build environment. The common misconception worth unlearning is that em and rem are interchangeable units; em compounds against the nearest font-size ancestor and rem is always relative to the root, which is why the unit converters here report both side by side and ask for the relevant root size only once. If you are new to the category, start with the markup validators on any handwritten code before publishing, and the unit converters the first time a layout needs to scale gracefully to large or small viewports. The category is small on purpose; the goal is to cover the cases that are common enough to need a tool but small enough that nobody wants a dedicated build pipeline for them. Larger tasks (linting an entire repo, running a full accessibility audit) belong in a real local toolchain, not in a web utility.

2 tools available