Report a focused, bounded set of structural Markdown diagnostics with source lines.
Text stays in this tab. Markdown is capped at 500 KiB; pasted HTML uses a 256 KiB cap.
No result is placed in a URL, account, preset, API, or remote log.
Explicit-profile, bounded, local processing
A linter can prove rules about parsed source. It cannot prove that prose is correct, a destination exists, an image is meaningful, or every publishing platform will render identically.
The report identifies heading-depth jumps, duplicate heading text, empty image alternatives, and raw HTML up to the documented diagnostic cap.
Processing stays in this browser and is bounded by a 500 KiB Markdown limit, a 256 KiB HTML limit, a 1 MiB result limit, and explicit syntax-tree limits. The public tool never calls the developer API, fetches a URL, or stores a preset.
The tool does not fetch links, interpret an editorial style guide, run code, or promise accessibility from syntax alone.
